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A design strategy of ratiometric optical probe for Fe3+ions and ascorbic acid detection based on europium-doped carbon dots 认领 引用
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作者 Min Li Mingyang Han +7 位作者 Xinying Song Yiming Chen Zepeng Wu Li Guan Fenghe Wang Dawei Wang Longfeng Lv Xu Li 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第5期1415-1424,共10页
Rare-earth doped carbon dots represent a new generation of nanomaterials,which achieve the functional modulation and property optimization of carbon dots materials.In this paper,Eu3+-doped carbon dots(Eu-CDs)were p... Rare-earth doped carbon dots represent a new generation of nanomaterials,which achieve the functional modulation and property optimization of carbon dots materials.In this paper,Eu3+-doped carbon dots(Eu-CDs)were prepared employing a one-step hydrothermal approach.The structure and properties of Eu-CDs were characterized using a transmission electron microscope(TEM),X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,etc.Eu-CDs exhibit a series of distinct emission peaks at 467,595,620 and 702 nm when excited at 395 nm,respectively.An“off-on”strategy for detecting of Fe3+and ascorbic acid was established on the basis of changes in luminescence peak intensity ratios of the CDs and Eu3+,which effectively reduces the detection limit compared with single-peak detection.The I467/I595 of Eu-CDs exhibits an excellent linear association with the concentrations of Fe3+or ascorbic acid,and the limit of detections are 0.15 and 0.13μmol/L,respectively,indicating that Eu-CDs can be applied for the quantitative measurement of Fe3+and ascorbic acid,and are successfully applied in real samples. 展开更多
关键词 Eu-CDs Luminescence peak intensity ratio Detection limit Fe3+ions Ascorbic acid Rare earths
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Synergistic Optimization of Electronic Structure and Defects via Light Zn-Doping for High Performance n-Type Bi2(Te,Se)3 Thermoelectrics in Cooling and Power Generation 认领 引用
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作者 Jiayi Peng Shulin Bai +12 位作者 Dongrui Liu Yi Wen Yixuan Hu Pengpeng Chen Dezheng Gao Lei Wang Suyao Liu Huiqiang Liang Xu Liu Yanling Pei Qing Tan Bingchao Qin Li-Dong Zhao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第3期346-379,共34页
The interdependence of electrical parameters has long inhibited the progress of bismuth telluride(Bi2Te3),limiting its widespread application in thermoelectric cooling and power generation.This work investigates th... The interdependence of electrical parameters has long inhibited the progress of bismuth telluride(Bi2Te3),limiting its widespread application in thermoelectric cooling and power generation.This work investigates the n-type Bi2Te2.79Se0.21I0.004(Bi2(Te,Se)3,BTS)system with light Zn doping,revealing that Zn addition simultaneously enhances the Seebeck coefficient(S)and electrical conductivity(σ)through the modulation of defect composition and multi-level band regulation.The substitution of Zn atoms at Bi sites enhances S via bandgap(Eg)widening,band flattening,and band splitting effects,contributing to a competitive power factor(PF)of∼60μW⋅cm−1⋅K−2.Additionally,thermal conductivity is maintained at a low level,leading to an extraordinary figure-of-merit(ZT)value of∼1.3 at room temperature.Furthermore,the Bi2Zn0.01Te2.79Se0.21I0.004 system demonstrates impressive thermoelectric device performance,with a maximum cooling temperature difference(ΔTmax)of∼70.0 K at 300 K,rising to∼78.0 K at 323 K and∼85.7 K at 343 K,as well as a maximum conversion efficiency(ηmax)of∼6.2%under aΔT of 200 K.This study clarifies the mechanism of Zn doping and presents a cost-effective strategy for enhancing the performance of n-type BTS thermoelectrics and their devices. 展开更多
关键词 thermoelectrics modulation defect composition bismuth telluride bi te limiting power generationthis electrical conductivity electronic structure defect optimization zn doping
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Green solvent engineering and additive modulation in stabilized black FAPbI3 perovskite single crystals for high-performance photodetectors 认领 引用
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作者 Meitong Guo Ying Wang +9 位作者 Binyi Zhou Siyv Li Bingbing Zhang Hongbo Huang Zhenguang Wang Leipeng Li Shufang Wang Linjuan Guo Caofeng Pan Zheng Yang 《Science China Materials》 SCIE EI CAS CSCD 2026年第7期4236-4244,共9页
Formamidine lead-based perovskites(FAPbI3)exhibit significant potential in optoelectronic applications.Nevertheless,they encounter challenges related to δ-phase instability and reliance on toxic solvents.In this s... Formamidine lead-based perovskites(FAPbI3)exhibit significant potential in optoelectronic applications.Nevertheless,they encounter challenges related to δ-phase instability and reliance on toxic solvents.In this study,we present a green solvent-additive synergy strategy that employsγ-valerolactone(GVL)in conjunction with reductive acids like oxalic acid(OA),to stabilize α-FAPbI3single crystals(SCs).GVL enhances the stability of the precursors through the formation of FA+-GVL hydrogen bonds and high-valence[PbIx]2-xclusters,resulting in ambient-stable α-phase SCs,yielding a marked improvement in stability compared to SCs prepared with the toxic solventγ-butyrolactone(GBL).Additive modulation demonstrates that H+and reductive groups play a critical role in regulating crystallization,suppressing the δ-phase by promoting FA+dissociation and inhibiting MA+deprotonation.A solvent-involved intermediate, δ-FAPbI3-GVL,has been identified;this intermediate evolves into α-FAPbI3at a low temperature of 60℃,thereby reducing the energy barriers associated with the α to δ phase transition.In contrast,non-reductive acids and reductive ionic liquids do not inhibit δ-phase formation,with the latter even promoting the crystallization of pure δ-FAPbI3.By utilizing low-volatility OA as an additive,optimized FA0.9MA0.1PbI3single crystal thin films exhibit a low defect density of 8.3×1011cm-3.Subsequently,a photodetector was fabricated.Under zero bias voltage and 780 nm illumination,the device exhibited a responsivity of 14.5 mA/W,a detectivity of 3.75×1010 Jones,and a response speed of 149/65μs.Moreover,without any encapsulation,the device’s performance diminished by only 17%after 30 days of storage in ambient conditions,indicating remarkable stability. 展开更多
关键词 FAPbI3 green solvent engineering solvent-involved intermediate additive modulation photodetector
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Enhanced stability of aqueous aluminum metal batteries via CeCl3-mediated water shielding and interfacial modification 认领 引用
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作者 Hao Zou Shuanghong Xia +3 位作者 Shi Tang Yunong Qin Ling Li Wenming Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第9期624-634,I0017,共11页
The stability and safety of aqueous aluminum metal batteries(AAMBs)have garnered an enormous amount of attention.However,severe corrosion during cycling and inefficient deposition behavior at the Al anode hinder their... The stability and safety of aqueous aluminum metal batteries(AAMBs)have garnered an enormous amount of attention.However,severe corrosion during cycling and inefficient deposition behavior at the Al anode hinder their application.In this paper,CeCl3was selected as a water inhibition additive to achieve active water confinement,which dramatically improved the corrosion behavior and prolonged the cycle life of the Al electrode.A combination of spectroscopic characterization and computational analysis showed that Cl-breaks hydrogen bonds in the electrolyte and has higher adsorption energy on Al,thus inhibiting water-induced corrosion.Meanwhile,Ce3+has a stronger affinity for Al than H2O,thus promoting the formation of the surface protective layer.Cl-in the modified electrolyte results in less hydration around Al3+.Due to the excellent water inhibition effect of CeCl3,the corrosion phenomenon of Al electrodes was significantly improved,and the dominant growth of the Al(111)crystal plane was achieved.Al//Prussian blue analogue(PBA)full cells with CeCl3exhibit significantly improved voltage polarization(0.342 V),cycle life(550 cycles),discharge specific capacity(112 mAh g-1),and selfdischarge behavior(87.97%).The Ce3+in the additive is also able to be co-intercalated into the PBA with Al3+,improving the stability of the PBA.However,the conductivity reduction of this strategy at higher concentrations needs to be further addressed.Compared with organic electrolyte and molten salt systems,the cycle life of the aqueous electrolyte in this work still falls short.This modification method paves the way for further development of efficient AAMBs. 展开更多
关键词 Water shielding additives CeCl3 Co-intercalation Interfacial adsorption Aqueous aluminum metal batteries
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State-selective single-and double-electron capture in collisions of low-energy S5+ ions with helium 认领 引用
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作者 Yixin Fan Dadi Xing +10 位作者 Shucheng Cui Xiaoxia Wang Junxia Ran Kaizhao Lin Xubin Zhu Dongmei Zhao Dalong Guo Yong Gao Shaofeng Zhang Xiaolong Zhu Xinwen Ma 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第7期53-58,共6页
State-selective single-and double-electron capture processes in collisions of S5+ions with helium at energies ranging from 50.8 keV to 100 keV were investigated using cold target recoil ion momentum spectroscopy(CO... State-selective single-and double-electron capture processes in collisions of S5+ions with helium at energies ranging from 50.8 keV to 100 keV were investigated using cold target recoil ion momentum spectroscopy(COLTRIMS).Q-value spectra and projectile scattering angle distributions were obtained.For single-electron capture,single electron capture into n=3 states of the projectile ion is dominant.As the projectile energy increases,the contribution of single electron capture into n=4 states is observed.Experimental relative cross-sections for single-electron capture into different projectile final states were compared with theoretical predictions based on the molecular orbital close-coupling(MOCC)method.In double-electron capture,two-electron populating into the 3s23p and 3s3p2states of projectile dominates.The reaction window calculated from the classical molecular Coulombic barrier model can qualitatively explain the experimental results.The scattering angle distribution of the multi-peak structure of the double-electron capture process is observed.The database is openly available in Science Data Bank at http://gffzzd3cc09b8251d45dfsf0w9ko5vw66w6bvc.ffgz.tsg.suse.edu.cn/10.57760/sciencedb.j00113.00233. 展开更多
关键词 state-selective electron-capture sulfur ion low-energy collisions cold target recoil ion momentum spectroscopy(COLTRIMS)
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Breakthroughs for kinetic enhancement of cathode materials in aqueous magnesium-ion batteries 认领 引用
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作者 Qingchen Wei Tongyang Deng +6 位作者 Hangwei Ren Wenlong Wang Wenhui Si Zhitao Wang Wenming Zhang Linjie Gao Song Chen 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期60-77,共18页
Aqueous magnesium-ion batteries(AMIBs)have been regarded as one of the most promising battery systems among the post-lithium-ion batteries due to their inherent safety,low cost and environmental friendliness.Unfortuna... Aqueous magnesium-ion batteries(AMIBs)have been regarded as one of the most promising battery systems among the post-lithium-ion batteries due to their inherent safety,low cost and environmental friendliness.Unfortunately,the sluggish cathode kinetics arising from the inherent high charge density and large ionic radius of Mg2+,alongside the structural constraints of cathode materials,remains a fundamental challenge hindering the broad deployment of AMIBs.Recent advances in cathode materials and their interfacial compatibility with electrolytes have yielded valuable insights for optimizing AMIBs systems.In this review,the energy storage mechanisms of AMIBs are systematically elucidated and discussed in detail.Besides,several optimization strategies for cathode materials are critically examined and thoroughly discussed,including but not limited to structural engineering,surface modification and electrolyte compatibility enhancement.Finally,we briefly address the outstanding challenges and potential future developments in this field.This review is poised to offer novel approaches and a significant impetus for material optimization,thereby enhancing the electrochemical performance of AMIBs and other emerging battery systems. 展开更多
关键词 Aqueous magnesium-ion batteries Cathode materials Kinetics improvement Energy storage mechanisms
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CoNxC active sites-rich three-dimensional porous carbon nanofibers network derived from bacterial cellulose and bimetal-ZIFs as efficient multifunctional electrocatalyst for rechargeable Zn–air batteries 认领 引用 被引量：8
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作者 Wenming Zhang Jingjing Chu +2 位作者 Shifeng Li Yanan Li Ling Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第12期323-332,共10页
In this work, a CoNxC active sites-rich three-dimensional porous carbon nanofibers network derived from bacterial cellulose and bimetal-ZIFs is prepared via a nucleation growth strategy and a pyrolysis process.The mat... In this work, a CoNxC active sites-rich three-dimensional porous carbon nanofibers network derived from bacterial cellulose and bimetal-ZIFs is prepared via a nucleation growth strategy and a pyrolysis process.The material displays excellent electrocatalytic activity for the oxygen reduction reaction, reaching a high limiting diffusion current density of -7.8 mA cm-2, outperforming metal–organic frameworks derived multifunctional electrocatalysts, and oxygen evolution reaction and hydrogen evolution reaction with low overpotentials of 380 and 107 mV, respectively. When the electrochemical properties are further evaluated, the electrocatalyst as an air cathode for Zn-air batteries exhibits a high cycling stability for63 h as well as a maximum power density of 308 mW cm-2, which is better than those for most Zn-air batteries reported to date. In addition, a power density of 152 mW cm-2 is provided by the solid-state Zn-air batteries, and the cycling stability is outstanding for 24 h. The remarkable electrocatalytic properties are attributed to the synergistic effect of the 3 D porous carbon nanofibers network and abundant inserted CoNxC active sites, which enable the fast transmission of ions and mass and simultaneously provide a large contact area for the electrode/electrolyte. 展开更多
关键词 Bacterial cellulose Bimetal-ZIFs CoNxC active sites 3D nitrogen-doped porous carbon nanofiber Zn-air batteries
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Enhancing thermoelectric performance of p-type SnTe through manipulating energy band structures and decreasing electronic thermal conductivity 认领 引用 被引量：8
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作者 Xin Qian Hao-Ran Guo +5 位作者 Jia-Xin Lyu Bang-Fu Ding Xing-Yuan San Xiao Zhang Jiang-Long Wang Shu-Fang Wang 《Rare Metals》 SCIE EI CAS CSCD 2024年第7期3232-3241,共10页
SnTe has received considerable attention as an environmentally friendly alternative to the representative thermoelectric material of PbTe.However,excessive hole carrier concentration in SnTe results in an extremely lo... SnTe has received considerable attention as an environmentally friendly alternative to the representative thermoelectric material of PbTe.However,excessive hole carrier concentration in SnTe results in an extremely low Seebeck coefficient and high thermal conductivity,which makes it exhibit relatively inferior thermoelectric properties.In this work,the thermoelectric performance of p-type SnTe is enhanced through regulating its energy band structures and reducing its electronic thermal conductivity by combining Bi doping with CdSe alloying.First,the carrier concentration of SnTe is successfully suppressed via Bi doping,which significantly decreases the electronic thermal conductivity.Then,the convergence and flattening of the valence bands by alloying CdSe effectively improves the effective mass of SnTe while restraining its carrier mobility.Finally,a maximum figure of merit(ZT) of~ 0.87 at 823 K and an average ZT of~ 0.51 at 300-823 K have been achieved in Sn0.96Bi0.04Te-5%CdSe.Our results indicate that decreasing the electronic thermal conductivity is an effective means of improving the performance of thermoelectric materials with a high carrier concentration. 展开更多
关键词 Thermoelectric materials SnTe Energy band structure Electronic thermal conductivity ZT value
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Influence of oxygen gas content on the structural and optical properties of ZnO thin films deposited by RF magnetron sputtering at room temperature 认领 引用 被引量：6
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作者 LIU Baoting ZHOU Yang +4 位作者 ZHENG Hongfang LI Mana GUO Zhe HAO Qingxun PENG Yingcai 《Rare Metals》 SCIE EI CAS CSCD 2011年第2期170-174,共5页
Zinc oxide （ZnO） thin films were deposited on sapphire （0001） substrates at room temperature by radiofrequency （RF） magnetron sputtering at oxygen gas contents of 0%, 25%, 50% and 75%, respectively. The influenc... Zinc oxide （ZnO） thin films were deposited on sapphire （0001） substrates at room temperature by radiofrequency （RF） magnetron sputtering at oxygen gas contents of 0%, 25%, 50% and 75%, respectively. The influence of oxygen gas content on the structural and optical properties of ZnO thin films was studied by a surface profile measuring system, X-ray diffraction analysis, atomic force microscopy, and UV spectro- photometry. It is found that the size of ZnO crystalline grains increases first and then decreases with the increase of oxygen gas content, and the maximum grain size locates at the 25% oxygen gas content. The crystalline quality and average optical transmittance （〉90%） in the visi- ble-light region of the ZnO film prepared at an oxygen gas content of 25% are better than those of ZnO films at the other contents. The obtained results can be attributed to the resputtefing by energetic oxygen anions in the growing process. 展开更多
关键词 thin films zinc oxide magnetron sputtering oxygen structural properties optical properties
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Strategies to advance thermoelectric performance of PbSe and PbS materials 认领 引用 被引量：7
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作者 Zheng-Hao Hou Xin Qian +2 位作者 Qiu-Juan Cui Shu-Fang Wang Li-Dong Zhao 《Rare Metals》 SCIE EI CAS CSCD 2024年第9期4099-4114,共16页
Thermoelectric materials possess the unique capability to convert thermal energy into electric energy and vice versa,making them promising for waste heat recovery and efficient cooling systems.Currently,extensively in... Thermoelectric materials possess the unique capability to convert thermal energy into electric energy and vice versa,making them promising for waste heat recovery and efficient cooling systems.Currently,extensively investigated thermoelectric materials such as Bi2Te3,PbTe and GeTe exhibit superior thermoelectric properties at room temperature and medium temperature regions.However,the broad application of these thermoelectric materials has been impeded by the high cost and restricted accessibility of Te and Ge in the earth's crust.Over the past few years,researchers have shown increasing interest in PbSe-and PbS-based materials,primarily attributed to their abundant elemental supply and relatively low costs.The assessment of research progress and a comprehensive overview of optimization strategies in time can significantly contribute to further improving the thermoelectric performance.These strategies include optimizing carrier concentration(aliovalent doping,dynamic doping and defect state),enhancing density-of-state effective mass(band convergence,band flattening and energy filtering effect),optimizing carrier mobility(band sharpening and band alignment)and reducing lattice thermal conductivity(all-scale hierarchical defect structures designing).This systematic summary and analysis provide novel insights and perspectives for the development of thermoelectric materials. 展开更多
关键词 PbSe and PbS thermoelectric materials Carrier concentration Density-of-state effective mass Carrier mobility Lattice thermal conductivity
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Synthesis and optical properties of Dy3+, Li^+ doped CaMoO_4 phosphor 认领 引用 被引量：5
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作者 关丽 贾国奇 +4 位作者 杨保柱 李旭 金立涛 杨志平 傅广生 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第6期540-543,共4页
A series of CaMoO4 phosphors doped with trivalent dysprosium ions （Dy3＋） and lithium （Li＋） were prepared by solid state method at 750 °C for 3 h. X-ray diffraction （XRD） confirmed the crystal structure an... A series of CaMoO4 phosphors doped with trivalent dysprosium ions （Dy3＋） and lithium （Li＋） were prepared by solid state method at 750 °C for 3 h. X-ray diffraction （XRD） confirmed the crystal structure and quality of phosphors. Scanning electron microscopy （SEM） in- dicated that the phosphors presented good crystalline state, and the crystalline grain sizes were about 0.5–3.0 μm. The emission spectra showed that the phosphors had intense emission at 480 （4F9/2→6H15/2）, 576 （4F9/2→6H13/2） and 660 nm （4F9/2→6H11/2）. Meanwhile, the excited spectra indicated it had intense excitation at 352 （6H15/2→6P7/2）, 390 （6H15/2→4M21/2） and 450 nm （6H15/2→4I15/2）. As a charge compensator, Li＋ ions were incorporated into CaMoO4：Dy3＋ phosphors, which enhanced the PL intensities depending on the doping concentration of Li＋. The optimal molar fraction of Dy3＋ ions in Ca1-xMoO4：xDy3＋, 0.05Li＋ was 0.05. 展开更多
关键词 photoluminescence CaMoO4：Dy3＋ charge compensator solid-state reaction rare earths
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Comparison of discharge characteristics and methylene blue degradation through a direct-current excited plasma jet with air and oxygen used as working gases 认领 引用 被引量：5
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作者 Jiacun WU Kaiyue WU +2 位作者 Chenhua REN Pengying JIA Xuechen LI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第5期126-133,共8页
Through using a direct-current driven plasma jet operated underwater,degradation of methylene blue(MB)is investigated with air and oxygen used as working gases.With a low power voltage,a plasma plume extends from the ... Through using a direct-current driven plasma jet operated underwater,degradation of methylene blue(MB)is investigated with air and oxygen used as working gases.With a low power voltage,a plasma plume extends from the needle electrode,which is purple in air.It turns pink after it bridges the two electrodes.During the process,oxygen plasma remains white.Discharge operates in a pulsed mode or a continuous one,which depends on the magnitude of power voltage.For the pulsed mode,oxygen discharge has a shorter plume and a higher pulse frequency than air discharge under the same power voltage.For the same current of the continuous mode,both power and gap voltages of oxygen discharge are higher than those of air discharge.Moreover,MB degradation efficiency increases with increasing power voltage or initial concentration of MB solution.Compared with air discharge,oxygen discharge has a higher degradation efficiency with the same power voltage and treatment time.The pulsed oxygen discharge with power voltage of about 6.5 k V has the highest efficiency in degrading MB dye,reaching approximately 85.8%after 10 min treatment.As a comparison,after 10 min treatment in air discharge,the highest degradation efficiency is 63.7%,which appears in the continuous mode at a power voltage of 10.6 kV.Besides,optical spectra from the discharges are also compared for the two types of working gases. 展开更多
关键词 plasma jet MB degradation pulsed mode continuous mode
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Enhanced breakdown strength and energy storage density of AgNbO3ceramics via tape casting 认领 引用 被引量：7
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作者 Ming-Yuan Zhao Jing Wang +4 位作者 Lin Chen Hao Yuan Mao-Hua Zhang Su-Wei Zhang Lei Zhao 《Rare Metals》 SCIE EI CAS CSCD 2023年第2期495-502,共8页
Antiferroelectric materials are promising candidates for energy-storage applications due to their double hysteresis loops,which can deliver high power density.Among the antiferroelectric materials,AgNbO3is proved a... Antiferroelectric materials are promising candidates for energy-storage applications due to their double hysteresis loops,which can deliver high power density.Among the antiferroelectric materials,AgNbO3is proved attractive due to its environmental-friendliness and high potential for achieving excellent energy storage performance.However,the recoverable energy storage density of AgNbO3ceramics is limited by their relatively low breakdown strength.Herein,the breakdown strength of the pure AgNbO3ceramics prepared using the tape casting method is enhanced to 307 kV·cm-1,which is,to the best of our knowledge,among the highest values reported for pure AgNbO-3bulk ceramics.The high breakdown strength may be due to its dense microstructure and good crystallinity obtained by the tape casting method and the optimized sintering temperature.Owing to its enhanced breakdown strength,AgNbO3ceramics show high recoverable energy storage density of 2.8 J·cm-3.These results have led to the development of lead-free antiferroelectric materials and devices with high energy storage density. 展开更多
关键词 AgNbO3 Energy storage performance Antiferroelectric Tape casting
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Structural and band tail state photoluminescence properties of amorphous SiC films with different amounts of carbon 认领 引用 被引量：5
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作者 傅广生 王新占 +3 位作者 路万兵 戴万雷 李兴阔 于威 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第10期472-477,共6页
Amorphous silicon carbide films are deposited by the plasma enhanced chemical vapour deposition technique,and optical emissions from the near-infrared to the visible are obtained.The optical band gap of the films incr... Amorphous silicon carbide films are deposited by the plasma enhanced chemical vapour deposition technique,and optical emissions from the near-infrared to the visible are obtained.The optical band gap of the films increases from 1.91 eV to 2.92 eV by increasing the carbon content,and the photoluminescence（PL） peak shifts from 1.51 eV to 2.16 eV.The band tail state PL mechanism is confirmed by analysing the optical band gap,PL intensity,the Stocks shift of the PL,and the Urbach energy of the film.The PL decay times of the samples are in the nanosecond scale,and the dependence of the PL lifetime on the emission energy also supports that the optical emission is related to the radiative recombination in the band tail state. 展开更多
关键词 amorphous silicon carbide band tail state photoluminescence time-resolved photoluminescence
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Synthesis and luminescence properties of a novel red Sr_3Bi(PO_4)_3:Sm3+ phosphor 认领 引用 被引量：3
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作者 杨志平 韩月 +2 位作者 宋延春 赵引红 刘鹏飞 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第12期1199-1202,共4页
A series of Sr3Bi1-x（PO4）3： xSm^3＋phosphors were prepared by solid state method at 1250 ℃ for 4 h. X-ray diffraction （XRD） indicated that the sample was of a pure phase of Sr3Bi（PO4）3. The main excitation pea... A series of Sr3Bi1-x（PO4）3： xSm^3＋phosphors were prepared by solid state method at 1250 ℃ for 4 h. X-ray diffraction （XRD） indicated that the sample was of a pure phase of Sr3Bi（PO4）3. The main excitation peaks were located at 343 （6H5/2→4H9/2）, 360 （6H5/2→4D3/2）, 373 （6H5/2→6p7/2）, 400 （6H5/2→4F7/2）, 414 （6H5/2→6P5/2） and 467 nm （6H5/2→4113/2）. The main emission were located at 563 （4G5/2→6H5/2）, 599 （4G5/2→6H7/2）, 646 （4G5/2→6H9/2） and 708 nm （4G5/2→6H11/2）. The intensest emission was excited by 400 nm. We studied the effect of different doping concentrations of Sm3＋ activator on the luminescence properties and found that the luminescent intensity first increased with Sm3＋ concentration increasing, and then decreased. The luminescent intensity had the best value when x=0.04. The chromaticity coordinates of the sample Sr3Bi0.96（PO4）3：0.04Sm3＋ were （x=0.57, y=0.36）, and the lifetime was 2.12 ms. 展开更多
关键词 rare earths Sr3Bi（PO4）3 red-emitting phosphor photoluminescence
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Co-Precipitation Synthesis and Spectral Characteristics of Long Afterglow Phosphor Y_2O_2S:Sm3+, Mg2+, Ti4+ 认领 引用 被引量：3
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作者 杨志平 李兴民 +4 位作者 刘冲 李旭 杨勇 徐小岭 李盼来 《Journal of Rare Earths》 SCIE EI CAS 2007年第1期23-26,共4页
Y2O2S：Sm^3＋, Mg^2＋, Ti^4＋ phosphor was synthesized by co-precipitation method. The crystalline structure of all synthesized phosphors was investigated by XRD. The result showed that all synthesized phosphors had a... Y2O2S：Sm^3＋, Mg^2＋, Ti^4＋ phosphor was synthesized by co-precipitation method. The crystalline structure of all synthesized phosphors was investigated by XRD. The result showed that all synthesized phosphors had a hexagonal crystal structure, which was the same as Y2O2S. The emission spectrum and excitation spectrum were measured, and the effect of Sm^3 ＋ molar ratio on the spectra was discussed. The emission spectra of the phosphors showed three emission peaks due to typical transitions of Sm^3 ＋ （4G5/2→6HJ ,J = 5/2, 7/2, 9/2）, and the emission peaks at 606 nm was stronger than others. With the increase of Sm^3 ＋ molar ratio, the emission intensity was strengthened. The excitation peaks were ascribed to the representative energy transition 4f→4f of Ti^4＋ phosphor prepared by co-precipitation method was Sm^3＋ ions. The results indicated that the Y2O2S ： Sm^3＋ , Mg^2＋ , an efficient long afterglow phosphor. 展开更多
关键词 Y2O2S： Sm^3＋ , Mg^2＋ , Ti^4＋ co-precipitation emission spectra excitation spectra rare earths
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Thermal stability and spectroscopic properties of Ho3+ doped tellurite-borate glasses 认领 引用 被引量：3
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作者 杨艳民 刘延洲 +2 位作者 蔡培庆 Ramzi Maalej Hyo Jin Seo 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第9期939-945,共7页
Ho3＋ ions doped tellurite-borate glass samples with varying compositions were prepared. The compositional dependence on phenomenological Judd-Ofelt parameters was compared in different kinds of rare earth ions doped ... Ho3＋ ions doped tellurite-borate glass samples with varying compositions were prepared. The compositional dependence on phenomenological Judd-Ofelt parameters was compared in different kinds of rare earth ions doped tellurite-borate glasses. Two methods were used to obtain radiative transition probability of 517 level with the aim of assuring the fitting quality. The integral absorption cross-sections and line shapes corresponding to 518--.5G6 and 518---5I7 transition of Ho3＋ ions were investigated in tellurite-borate glasses. The obtained data indicated that the integral absorption cross-sections corresponding to 518-5G6 transition of Ho3＋ ions mainly depended on phenomenological Judd-Ofelt parameter, g22, because 518---5G6 transition belonged to hypersensitive transitions, which led to a larger gP2 value. The change of line shapes of absorption spectra corresponding to 518-5G6 and 518-517 transitions of Ho3＋ ions came from the lower energy regions, which could be attributed to the changed distribution of Stark levels and thermal population. 展开更多
关键词 Ho3＋ tellurite-borate glasses cross sections line shapes rare earths
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Realization of homogeneous dielectric barrier discharge in atmospheric pressure argon and the effect of beads on its characteristics 认领 引用 被引量：2
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作者 Junxia RAN Xuexue ZHANG +6 位作者 Yu ZHANG Kaiyue WU Na ZHAO Xingran HE Xiuhong DAI Qihang LIANG Xuechen LI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第5期77-84,共8页
This paper describes the realization of a homogeneous dielectric barrier discharge(DBD)in argon at atmospheric pressure.The effect of the morphology of the dielectric surface(especially the dielectric surface covered ... This paper describes the realization of a homogeneous dielectric barrier discharge(DBD)in argon at atmospheric pressure.The effect of the morphology of the dielectric surface(especially the dielectric surface covered by hollow ceramic beads(99%Al2O3)with different diameters)on discharge is investigated.With different dielectrics,the argon DBD presents two discharge modes:a filamentary mode and a homogeneous mode.Fast photography shows that the filamentary mode operates in a streamer discharge,and the homogeneous mode operates in a Townsend discharge regime.It is found that a homogeneous discharge can be generated within a certain voltage range.The voltage amplitude range decreases,and the breakdown voltage increases with the increase in the mean diameter of the ceramic beads.Waveforms of the total current and optical emission signal present stochastic pulses per half voltage cycle for the filamentary mode,whereas there is one single hump per half voltage cycle for the homogeneous mode.In the homogeneous mode,the intensity of the optical emission decreases with the mean diameter of the ceramic beads.The optical emission spectrum is mainly composed of atomic lines of argon and the second positive system of molecular nitrogen.It reveals that the electron density decreases with the increasing mean diameter of the ceramic beads.The vibrational temperature increases with the increasing mean diameter of the ceramic beads.It is believed that a large number of microdischarges are formed,and smaller ceramic beads have a larger activation surface area and more point discharge.Electrons liberated in the shallow well and electrons generated from microdischarges can increase the secondary electron emission coefficient of the cathode and provide initial electrons for discharge continuously.Therefore,the breakdown electric field is reduced,which contributes to easier generation of homogeneous discharge.This is confirmed by the simulation results. 展开更多
关键词 dielectric barrier discharge homogeneous discharge Townsend discharge microdischarge secondary electron emission
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Numerical simulation and analysis of complex patterns in a two-layer coupled reaction diffusion system 认领 引用 被引量：2
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作者 李新政 白占国 +2 位作者 李燕 贺亚峰 赵昆 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第4期491-496,共6页
The resonance interaction between two modes is investigated using a two-layer coupled Brusselator model. When two different wavelength modes satisfy resonance conditions, new modes will appear, and a variety of superl... The resonance interaction between two modes is investigated using a two-layer coupled Brusselator model. When two different wavelength modes satisfy resonance conditions, new modes will appear, and a variety of superlattice patterns can be obtained in a short wavelength mode subsystem. We find that even though the wavenumbers of two Turing modes are fixed, the parameter changes have influences on wave intensity and pattern selection. When a hexagon pattern occurs in the short wavelength mode layer and a stripe pattern appears in the long wavelength mode layer, the Hopf instability may happen in a nonlinearly coupled model, and twinkling-eye hexagon and travelling hexagon patterns will be obtained. The symmetries of patterns resulting from the coupled modes may be different from those of their parents, such as the cluster hexagon pattern and square pattern. With the increase of perturbation and coupling intensity, the nonlinear system will con- vert between a static pattern and a dynamic pattern when the Turing instability and Hopf instability happen in the nonlinear system. Besides the wavenumber ratio and intensity ratio of the two different wavelength Turing modes, perturbation and coupling intensity play an important role in the pattern formation and selection. According to the simulation results, we find that two modes with different symmetries can also be in the spatial resonance under certain conditions, and complex patterns appear in the two-layer coupled reaction diffusion systems. 展开更多
关键词 Brusselator model pattern formation Turing mode instability
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Label-Free and Real-Time Detection of Antigen-Antibody Capture Processes Using the Oblique-Incidence Reflectivity Difference Technique 认领 引用 被引量：2
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作者 HE Li-Ping DAI Jun +6 位作者 SUN Yue WANG Jing-Yi LU Hui-Bin WANG Shu-Fang JIN Kui-Juan ZHOU Yue-Liang YANG Guo-Zhen 《Chinese Physics Letters》 SCIE EI CAS CSCD 2012年第7期39-41,共3页
We successfully label-free and real-time detect the capture processes of human immunoglobulin G (IgG)/goat anti-human IgG and mouse IgG/goat anti-mouse IgG antigen-antibody pairs with different concentrations using th... We successfully label-free and real-time detect the capture processes of human immunoglobulin G (IgG)/goat anti-human IgG and mouse IgG/goat anti-mouse IgG antigen-antibody pairs with different concentrations using the oblique-incidence reflectivity difference (OIRD) method,and obtain the interaction kinetics curves and the interaction times.The experimental results prove that the OIRD method is a promising technique for label-free and real-time detection of the biomolecular interaction processes and achieving the quantitative information of interaction kinetics. 展开更多
关键词 kinetics interaction kinetics
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