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Effects of Cu+and Sc3+codoping on luminescence and scintillation properties of Cs2LiYCl6:Ce single crystals 认领 引用
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作者 Yuhao Zhang Yufeng Tong +2 位作者 Lei Zong Guohao Ren Yuntao Wu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第12期2637-2645,I0002,共9页
In this study,a batch of φ12 mm Cs2LiYCl6:Ce crystals codoped with different contents of Cu+and Sc3+was successfully grown using the Multi-ampule Bridgeman method.A new emission peaking at 418 nm is found... In this study,a batch of φ12 mm Cs2LiYCl6:Ce crystals codoped with different contents of Cu+and Sc3+was successfully grown using the Multi-ampule Bridgeman method.A new emission peaking at 418 nm is found in the photoluminescence spectra of CLYC:Ce codoped with Cu+ion.Codoping Cu+or Sc3+both increases the proportion of intrinsic self-trapped exciton(STE)luminescence,and extends the excitation band of Ce3+,especially in Cu+codoped samples,where a new absorption peak at 248 nm can be identified.The light yield of Cu+codoped samples remains largely unchanged,but the energy resolution shows a slight deterioration.Both light yield and energy resolution degrade after Sc3+codoping,and the effect is much severe than that of Cu+codoped samples.X-ray induced afterglow can be suppressed after Cu+codoping and low content of Sc3+codoping.The scintillation decay variation also depends on the codoping ions and their contents. 展开更多
关键词 Cs2LiYCl6:Ce crystal Li-based elpasolites crystal Scintillator Codoping Rare earths
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Realizing Cd and Ag codoping in p-type Mg3Sb2toward high thermoelectric performance 认领 引用 被引量：5
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作者 Shijuan Xiao Kunling Peng +6 位作者 Zizhen Zhou Huan Wang Sikang Zheng Xu Lu Guang Han Guoyu Wang Xiaoyuan Zhou 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第7期2486-2494,共9页
Mg3Sb2has attracted intensive attention as a typical Zintl-type thermoelectric material.Despite the exceptional thermoelectric performance in n-type Mg3Sb2,the dimensionless figure of merit(zT)of p-type Mg... Mg3Sb2has attracted intensive attention as a typical Zintl-type thermoelectric material.Despite the exceptional thermoelectric performance in n-type Mg3Sb2,the dimensionless figure of merit(zT)of p-type Mg3Sb2remains lower than 1,which is mainly attributed to its inferior electrical properties.Herein,we synergistically optimize the thermoelectric properties of p-type Mg3Sb2materials via codoping of Cd and Ag,which were synthesized by high-energy ball milling combined with hot pressing.It is found that Cd doping not only increases the carrier mobility of p-type Mg3Sb2,but also diminishes its thermal conductivity(κtot),with Mg2.85Cd0.5Sb2achieving a lowκtot value of∼0.67 W m−1K−1at room temperature.Further Ag doping elevates the carrier concentration,so that the power factor is optimized over the entire temperature range.Eventually,a peak zT of∼0.75 at 773 K and an excellent average zT of∼0.41 over 300−773 K are obtained in Mg2.82Ag0.03Cd0.5Sb2,which are∼240%and∼490%higher than those of pristine Mg3.4Sb2,respectively.This study provides an effective pathway to synergistically improve the thermoelectric performance of p-type Mg3Sb2by codoping Cd and Ag,which is beneficial to the future applications of Mg3Sb2-based thermoelectric materials. 展开更多
关键词 Thermoelectric p-type Mg3Sb2 Cd and Ag codoping Lattice thermal conductivity Carrier concentration
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Effect of the codoping of N-H-O on the growth characteristics and defects of diamonds under high temperature and high pressure 认领 引用 被引量：3
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作者 Zhenghao Cai Bowei Li +5 位作者 Liangchao Chen Zhiwen Wang Shuai Fang Yongkui Wang Hongan Ma Xiaopeng Jia 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第10期113-119,共7页
Diamond crystals were synthesized with different doping proportions of N-H-O at 5.5 GPa-7.1 GPa and 1370℃-1450℃. With the increase in the N-H-O doping ratio, the crystal growth rate decreased, the temperature and pr... Diamond crystals were synthesized with different doping proportions of N-H-O at 5.5 GPa-7.1 GPa and 1370℃-1450℃. With the increase in the N-H-O doping ratio, the crystal growth rate decreased, the temperature and pressure conditions required for diamond nucleation became increasingly stringent, and the diamond crystallization process was affected. [111] became the dominant plane of diamonds;surface morphology became block-like;and growth texture,stacking faults, and etch pits increased. The diamond crystals had a two-dimensional growth habit. Increasing the doping concentration also increased the amount of N that entered the diamond crystals as confirmed via Fourier transform infrared spectroscopy. However, crystal quality gradually deteriorated as verified by the red-shifting of Raman peak positions and the widening of the Raman full width at half maximum. With the increase in the doping ratio, the photoluminescence property of the diamond crystals also drastically changed. The intensity of the N vacancy center of the diamond crystals changed, and several Ni-related defect centers, such as the NE1 and NE3 centers, appeared. Diamond synthesis in N-H-O-bearing fluid provides important information for deepening our understanding of the growth characteristics of diamonds in complex systems and the formation mechanism of natural diamonds, which are almost always N-rich and full of various defect centers. Meanwhile, this study proved that the type of defect centers in diamond crystals could be regulated by controlling the N-H-O impurity contents of the synthesis system. 展开更多
关键词 HPHT N-H-O codoping synthetic diamond nitrogen concentration defects in diamond
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Local coordination and electronic interactions of Pd/MXene via dual‐atom codoping with superior durability for efficient electrocatalytic ethanol oxidation 认领 引用 被引量：2
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作者 Zhangxin Chen Fan Jing +7 位作者 Minghui Luo Xiaohui Wu Haichang Fu Shengwei Xiao Binbin Yu Dan Chen Xianqiang Xiong Yanxian Jin 《Carbon Energy》 SCIE EI CAS CSCD 2024年第8期166-177,共12页
Catalyst design relies heavily on electronic metal‐support interactions,but the metal‐support interface with an uncontrollable electronic or coordination environment makes it challenging.Herein,we outline a promisin... Catalyst design relies heavily on electronic metal‐support interactions,but the metal‐support interface with an uncontrollable electronic or coordination environment makes it challenging.Herein,we outline a promising approach for the rational design of catalysts involving heteroatoms as anchors for Pd nanoparticles for ethanol oxidation reaction(EOR)catalysis.The doped B and N atoms from dimethylamine borane(DB)occupy the position of the Ti3C2 lattice to anchor the supported Pd nanoparticles.The electrons transfer from the support to B atoms,and then to the metal Pd to form a stable electronic center.A strong electronic interaction can be produced and the d‐band center can be shifted down,driving Pd into the dominant metallic state and making Pd nanoparticles deposit uniformly on the support.As‐obtained Pd/DB–Ti3C2 exhibits superior durability to its counterpart(∼14.6% retention)with 91.1% retention after 2000 cycles,placing it among the top single metal anodic catalysts.Further,in situ Raman and density functional theory computations confirm that Pd/DB–Ti3C2 is capable of dehydrogenating ethanol at low reaction energies. 展开更多
关键词 durability electronic interactions ethanol oxidation heteroatom codoping Pd/MXene
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Phase transformation and morphology tuning of β-NaYF_4:Yb3+,Er3+ nanocrystals through K^+ ions codoping 认领 引用 被引量：2
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作者 梁志琴 赵谡玲 +3 位作者 崔越 田丽娇 张俊杰 徐征 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第3期384-389,共6页
In this work, a simple method to modulate the crystal phase and morphology with a large amount of K＋ions codoping is proposed. The phase changes to the mixture of β-Na YF4 and β-KYF4 with increasing the content of... In this work, a simple method to modulate the crystal phase and morphology with a large amount of K＋ions codoping is proposed. The phase changes to the mixture of β-Na YF4 and β-KYF4 with increasing the content of K^＋ions to 80 mol%.When it exceeds 80 mol%, β-Na YF4 disappears gradually and β-KYF4 dominates with a poor crystalline. In addition, the morphology changes from nanosphere to nanoplate, and then to nanoprism, which indicates that a higher content of K^＋ions favors the growth rates along [0001] than the [10-10] of the nanocrystals. Additionally, the upconversion（UC） luminescence properties and the ratio of red/green（R/G） UC intensity of samples with different phases and morphologies are detected,which makes it possible to tune the UC fluorescence by varying the concentration of K^＋ions. 展开更多
关键词 upconversion fluorescence NaYF4：Yb Er K＋ ions codoping
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Band gap narrowing of TiO_2 by compensated codoping for enhanced photocatalytic activity 认领 引用 被引量：1
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作者 Jindou Huang Shuhao Wen +1 位作者 Jianyong Liu Guozhong He 《Journal of Natural Gas Chemistry》 CSCD 2012年第3期302-307,共6页
In this study, we have performed first-principles screened exchanged hybrid density function theory with the HSE06 function calculations of the C-Mo, C-W, N-Nb and N-Ta codoped anatase TiO2 systems to investigate the ... In this study, we have performed first-principles screened exchanged hybrid density function theory with the HSE06 function calculations of the C-Mo, C-W, N-Nb and N-Ta codoped anatase TiO2 systems to investigate the effect of codoping on the electronic structure of TiO2. The calculated results demonstrate that （W（s）＋C（s）） codoped TiO2 narrows the band gap significantly, and have little influence on the position of conduction band edges, therefore, enhances the efficiency of the photocatalytic hydrogen generation from water and the photodegradation of organic pollutants. Moreover, the proper oxygen pressure and temperature are two key factors during synthesis which should be carefully under control so that the desired （W（s）＋C（s）） codoped TiO2 can be obtained. 展开更多
关键词 hybrid DFT TiO2 codoping thermodynamic stability band gap photocatalysts
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Revisiting the Electron-Doped SmFeAsO:Enhanced Superconductivity up to 58.6 K by Th and F Codoping 认领 引用 被引量：1
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作者 王小川 于佳 +6 位作者 阮彬彬 潘伯津 穆青隔 刘通 赵康 陈根富 任治安 《Chinese Physics Letters》 SCIE EI CAS CSCD 2017年第7期228-231,共4页
In the iron-based high-To bulk superconductors, Tc above 50 K was only observed in the electron-doped 1111-type compounds. Here we revisit the electron-doped SmFeAsO polycrystals to make a further investigation for th... In the iron-based high-To bulk superconductors, Tc above 50 K was only observed in the electron-doped 1111-type compounds. Here we revisit the electron-doped SmFeAsO polycrystals to make a further investigation for the highest Tc in these materials. To introduce more electron carriers and less crystal lattice distortions, we study the Th and F eodoping effects into the Sm-O layers with heavy electron doping. Dozens of Sm1-xThx FeAsO1-yFy samples are synthesized through the solid state reaction method, and these samples are carefully characterized by the structural, resistive, and magnetic measurements. We find that the codoping of Th and F clearly enhances the superconducting Tc more than the Th or F single-doped samples, with the highest record Tc up to 58.6K when x = 0.2 and y=0.225. Further element doping causes more impurities and lattice distortions in the samples with a weakened superconductivity. 展开更多
关键词 Th As Revisiting the Electron-Doped SmFeAsO:Enhanced Superconductivity up to58.6K by Th and F Codoping
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A Density Functional Theory Study of Codoping Characteristics of Sulfur with Alkaline Earth in Delafossite CuAlO_2 认领 引用
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作者 刘其军 秦涵 刘正堂 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第4期527-530,共4页
The structural,electronic properties and formation energies of sulfur and alkaline earth codoped delafossite CuAlO_2 have been investigated using the first-principles density functional theory calculations.Our results... The structural,electronic properties and formation energies of sulfur and alkaline earth codoped delafossite CuAlO_2 have been investigated using the first-principles density functional theory calculations.Our results reveal that the volume of codoping systems increases with the increasing atomic radius of metal atoms.The formation energies under different growth conditions have been calculated,showing that the codoping systems are formed easily under O-rich growth conditions.Electronic band structures and density of states have been obtained.The decreased bandgaps,enhanced covalence and appearance of electron acceptors after codoping are all good for p-type conductivity. 展开更多
关键词 first-principles codoping p-type conductivity CuAlO_2
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N/S codoping modification based on the metal organic frameworkderived carbon to improve the electrochemical performance of different energy storage devices 认领 引用 被引量：6
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作者 Ziyi Zhu Xue Li +4 位作者 Zhong Zhang Qi Meng Wenjia Zhang Peng Dong Yingjie Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第11期394-403,I0011,共10页
Carbon-based materials have become a research hotspot in the field of energy storage devices in recent years due to their abundant resources,low cost,and environmental friendliness.However,the low capacity and poor hi... Carbon-based materials have become a research hotspot in the field of energy storage devices in recent years due to their abundant resources,low cost,and environmental friendliness.However,the low capacity and poor high rate performance still constitute great challenges.Metal organic framework-derived carbon has been widely researched because of its high porosity,tunable structure,and good conductivity.In this work,N/S codoped hierarchical porous carbon microspheres were prepared by a high-temperature heat treatment and atomic doping process using a zinc-based organic framework as the precursor.When used as a potassium-ion battery anode,it has a high reversible specific capacity(435.7 mAh g-1),good rate performance(133.5 mAh g-1at 10,000 m A g-1),and long-term cycling stability(73.2%capacity retention after the 2500th cycle).The potassium storage mechanism of the derived carbon was explained by various electrochemical analysis methods and microstructure characterization techniques,and the relationship between the structural characteristics and electrochemical properties was researched.In a supercapacitor,the porous carbon material exhibits a specific capacitance of 307.2 F g-1at a current density of 0.2 A g-1in a KOH aqueous solution and achieves a retention rate of 99.88%after 10,000 cycles.The assembled symmetric supercapacitor device delivers a high energy density of 6.69 Wh kg-1,with a corresponding power density of 2500 W kg-1.In addition,density functional theory calculations further confirmed that N/S codoping can improve the adsorption capacities of potassium and hydroxyl ions in the derived carbon. 展开更多
关键词 N/S codoped Carbon microspheres Metal organic frameworks Potassium-ion batteries Supercapacitors
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Charge-balanced codoping enables exceeding doping limit and ultralow thermal conductivity 认领 引用
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作者 Long Chen Chun Wang +3 位作者 Lin Wang Minghao Wang Yongchun Zhu Changzheng Wu 《中国科学技术大学学报》 CAS CSCD 北大核心 2024年第6期1-7,I0009,共7页
Materials with low thermal conductivity are applied extensively in energy management,and breaking the amorphous limits of thermal conductivity to solids has attracted widespread attention from scientists.Doping is a c... Materials with low thermal conductivity are applied extensively in energy management,and breaking the amorphous limits of thermal conductivity to solids has attracted widespread attention from scientists.Doping is a common strategy for achieving low thermal conductivity that can offer abundant scattering centers in which heavier dopants always result in lower phonon group velocities and lower thermal conductivities.However,the amount of equivalent heavyatom single dopant available is limited.Unfortunately,nonequivalent heavy dopants have finite solubility because of charge imbalance.Here,we propose a charge balance strategy for SnS by substituting Sn2+with Ag+and heavy Bi3+,improving the doping limit of Ag from 2%to 3%.Ag and Bi codoping increases the point defect concentration and introduces abundant boundaries simultaneously,scattering the phonons at both the atomic scale and nanoscale.The thermal conductivity of Ag0.03Bi0.03Sn0.94S decreased to 0.535 W·m−1·K−1at room temperature and 0.388 W·m−1·K−1at 275°C,which is below the amorphous limit of 0.450 W·m−1·K−1for SnS.This strategy offers a simple way to enhance the doping limit and achieve ultralow thermal conductivity in solids below the amorphous limit without precise structural modification. 展开更多
关键词 charge-balanced codoping heavy atom point defect grain boundary ultralow thermal conductivity
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Upconversion Luminescence Properties of NaY0.92Yb0.05Er0.03F4 Enhanced by Zr^4+ Codoping 认领 引用
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作者 刘宏升 徐汉东 +3 位作者 黄清明 曹文兵 俞瀚 于岩 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2017年第10期1743-1751,共9页
In this paper we present a novel report on the upconversion luminescence performance of NaY0.92Yb0.05Er0.03F4 enhanced by Zr^4＋ codoping. The luminescence intensity of the tridoped hexagonal NaYF_4 synthesized by a h... In this paper we present a novel report on the upconversion luminescence performance of NaY0.92Yb0.05Er0.03F4 enhanced by Zr^4＋ codoping. The luminescence intensity of the tridoped hexagonal NaYF_4 synthesized by a hydrothermal method increased to the maximum, about seven times of the non-Zr^4＋ sample when the Zr^4＋ codoping concentration rose to 6 mol%, while the luminescence lifetime was also prolonged by Zr^4＋ codoping. To explore the relationships between the microstructure and upconversion properties, X-ray powder diffraction, field emission scanning electron microscope, electron energy-dispersive spectroscopy and upconversion emission spectroscopy were employed. From these characterizations, we found that the codoping of Zr^4＋ could modulate the crystal microstructure of NaYF_4 for higher upconversion luminescence intensity and longer lifetime. This study may be helpful for the design and synthesis of high-performance upconversion materials. 展开更多
关键词 NaYF4 upconversion Zr^4＋ codoping
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Ultra-broadband near-infrared double-perovskite Mg2YVO6:Cr3+,Ni2+phosphors with high efficiency and thermal stability achieved via energy transfer 认领 引用
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作者 Yan Fan Haoyi Wu +2 位作者 Yahong Jin Yanmei Li Yihua Hu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第5期1397-1407,共11页
Near-infrared second window(NIR-Ⅱ;1000-1700 nm)phosphor-converted light-emitting diodes(pc-LEDs)have received substantial attention owing to their widespread applications in night vision,bioimaging,and nondestructive... Near-infrared second window(NIR-Ⅱ;1000-1700 nm)phosphor-converted light-emitting diodes(pc-LEDs)have received substantial attention owing to their widespread applications in night vision,bioimaging,and nondestructive testing.However,efficient NIR-Ⅱbroadband phosphors that can be excited by commercially available blue-LED chips are lacking.Ni2+-activated phosphors typically emit in the NIR-Ⅱregion;however,because of their poor absorption in the blue-light region,their quantum efficiency is low.Herein,Cr3+,Ni2+-coactivated NIR Mg2YVO6(MYVO)double-perovskite phosphors were synthesized via the high-temperature solid-state reaction,realizing double emission in the NIR-ⅠandⅡregions ranging from 700 to 1700 nm.Under 473 nm excitation,owing to the efficient energy transfer(ET)from Cr3+to Ni2+,the MYVO:Cr3+,Ni2+phosphor exhibits an improved NIR-Ⅱemission peak at 1334 nm,demonstrating a full-width at half maximum of 240 nm.Compared with that of MYVO:0.015Ni2+,the internal quantum efficiency of MYVO:0.015Cr3+,0.015Ni2+increases from 15.4%to 42.4%while maintaining excellent overall thermal stability(89.34%at 423 K).Finally,the MYVO:Cr3+,Ni2+phosphor is combined with a 475 nm blue chip to fabricate an NIR pc-LED,demonstrating the potential applications of NIR-Ⅱlight sources in night vision,biological imaging,and spectral analysis.The codoping of Cr3+and Ni2+addresses the issue of the ineffective excitation of Ni2+luminescence by blue light,providing a design approach to the development of numerous ultra-broadband NIR-Ⅱpc-LEDs based on blue-LED chips. 展开更多
关键词 Cr3+-Ni2+codoping Energy transfer Near-infrared-II luminescence Bioimaging Blue-light excitation Rare earths
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C-N-S tridoping into TiO2matrix for photocatalytic applications:observations,speculations and contradictions in the codoping process 认领 引用 被引量：5
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作者 C.Sushma S.Girish Kumar 《Inorganic Chemistry Frontiers》 SCIE EI 2017年第8期1250-1267,共18页
The bulk heterostructuring of TiO2via codoping with nonmetals still holds possibilities for the potential development of a visible light photocatalyst and for overcoming the obstacles bracketed with metal ion subst... The bulk heterostructuring of TiO2via codoping with nonmetals still holds possibilities for the potential development of a visible light photocatalyst and for overcoming the obstacles bracketed with metal ion substitution.In particular,tridoping of C-N-S into TiO2was spotlighted with due consideration of its mesmerizing features like simultaneous and relatively low energy substitution of carbon,nitrogen and sulfur from the available precursors(thiourea,L-cystine and L-cysteine),stabilization of the anatase crystal structure,red shift in the band gap response towards the solar spectrum,cooperative interactions with these codopants,and the absence of any impure phase formation even at elevated temperature and with high doping density during the substitution process.Despite these flexibilities,accessible reports on C-N-S-TiO2are not extensive and the discussions presented are far from the relevant aspects of the doping mechanism.With the intention of shedding light on the pros and cons of C-N-S-TiO2,this review is framed with the following viewpoints:(i)underscoring their beneficial effects in photocatalysis;(ii)underlining the doping mode of each dopant in the codoped system with respect to the reaction conditions;(iii)contradictions about the doping states of each dopant in the codoped system with reference to the previous literature;(iv)tentative discussion concepts like modifications of defect structures,dopant distribution,doping mode,mutual interferences among the dopants and crystallization kinetics in the course of codoping.The results emphasize that the codoping process involving carbon,nitrogen and sulfur is quite obfuscated as several doping modes are witnessed for each dopant,which are coupled to other factors like dopant diffusivity and solubility,extent of doping,dopant segregation at the surface,nature of the dopant precursor,unpredictable interactions of the dopant states,and interactive reactions between the dopant and titania precursor together with the annealing conditions.With critical analysis with reference to TiO2,it is envisaged that thiourea is the best functional precursor to attain diverse doping states for nitrogen,and cationic and anionic doping states for carbon and sulfur,together with the formation of adsorbed sulfate anions.Future research must shed light on the dopant-dopant and dopant-lattice interactions followed by their synergism at the structure-electronic level to uncover the doping mechanism in the codoped systems. 展开更多
关键词 bulk heterostructuring tridoping visible light photocatalyst codoping overcoming obstacles C N S metal ion codoping nonmetals
Reconstruction of magnetic exchange networks for highperformance Co-free Ni-rich cathodes 认领 引用
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作者 Zexin Mo Xiaoyan Xie +3 位作者 Zhiyuan Hua Zhan Lin Chenyu Liu Jiaxiang Cui 《Energy Materials and Devices》 CAS 2026年第2期31-42,共12页
Co-free Ni-rich layered oxide LiNi0.8Mn0.2O2 has garnered considerable attention due to its high energy density and low cost.However,under high-voltage operation,its practical application suffers from severe ... Co-free Ni-rich layered oxide LiNi0.8Mn0.2O2 has garnered considerable attention due to its high energy density and low cost.However,under high-voltage operation,its practical application suffers from severe lattice oxygen release and irre-versible H2→H3 transition,resulting in structural degradation and rapid capacity fading.To address this inconvenience,this study proposes a Fe/Zr codoping strategy:the incorporated Fe modulates the local transition metal-oxygen elec-tronic environment and stabilizes the local oxygen coordination environment via Fe-O interactions,while Zr4+exerts a lattice-anchoring effect through strong Zr-O bonding,thereby suppressing oxygen loss and detrimental phase transitions upon deep delithiation.The codoped cathode material retains a well-defined layered structure and exhibits superior elec-trochemical performance;it delivers a high reversible capacity of 207.06 mAh g−1 at 0.1 C,achieves capacity retention of 81.55%after 200 cycles at 1 C,and maintains a high rate capability of 141.76 mAh g−1 at 5 C.This study provides an effective doping strategy for stabilizing lattice oxygen and modulating charge compensation in Co-free Ni-rich cathode materials. 展开更多
关键词 lattice oxygen release high performance co free Ni rich cathodes Lini Mn O irreversible H H transition structural degradation Fe Zr codoping magnetic exchange networks h h transitionresulting
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Triplet–triplet energy transfer from Bi3+to Sb3+in zero-dimensional indium hybrids via a B-site codoping strategy toward white-light emission 认领 引用 被引量：5
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作者 Qiqiong Ren Jian Zhang +2 位作者 Maxim S.Molokeev Guojun Zhou Xian-Ming Zhang 《Inorganic Chemistry Frontiers》 SCIE EI 2022年第22期5960-5968,共9页
Low-dimensional metal halides have emerged as promising platforms for the development of new-generation phosphor-converted light emitting diodes(pc-LEDs),in which zero-dimensional(0D)hybrids with lone-pair ns2state... Low-dimensional metal halides have emerged as promising platforms for the development of new-generation phosphor-converted light emitting diodes(pc-LEDs),in which zero-dimensional(0D)hybrids with lone-pair ns2states,in particular,show unprecedented competitiveness owing to their fascinating photoluminescence(PL)properties. 展开更多
关键词 b site codoping triplet triplet energy transfer low dimensional metal halides bi sb zero dimensional hybrids phosphor converted light emitting diodes metal halides
Enhancement of the upconversion luminescence in Y_2O_3:Er3+ powders by codoping with La3+ ions 认领 引用 被引量：2
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作者 雷若姗 王焕平 +2 位作者 徐时清 田颖 黄立辉 《Chinese Optics Letters》 SCIE EI CAS CSCD 2015年第2期71-73,共3页
Infrared-to-visible upconverted luminescent spectra of Er3 t and La3 t codoped Y2O3 powders are investigated.By introducing La3 t ions, the upconversion green radiation is found to be greatly enhanced when compared wi... Infrared-to-visible upconverted luminescent spectra of Er3 t and La3 t codoped Y2O3 powders are investigated.By introducing La3 t ions, the upconversion green radiation is found to be greatly enhanced when compared with the powders with La3 t absent. Such enhancement can be attributed to the modification of the local symmetry surrounding the Er3 t ion, which benefits the intra-4f transitions of Er3 t ion, and the decreasing interaction between Er3 t ions, which suppresses the energy transfer process4F7∕2t 4I11∕2→ 4F9∕2t 4F9∕2. 展开更多
关键词 Enhancement of the upconversion luminescence in Y2O3 ions powders by codoping with La
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FA Doping for Strain Relaxation and Fermi Energy Management in B-site Co-doped MAPbI3 Toward Efficient Transport Layer-free Photodetectors 认领 引用
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作者 CHEN Mingming LIU Kangyuan +3 位作者 ZHANG Huimin LIU Yuan WU Chunxia CAO Dawei 《发光学报》 EI CAS CSCD 北大核心 2026年第6期970-982,共13页
B-site metal doping has potentials to suppress both the point defects and boundary defects of lead halide perovskites,while the differences in ionic radii of dopants and parent atoms induce remarkable local strains th... B-site metal doping has potentials to suppress both the point defects and boundary defects of lead halide perovskites,while the differences in ionic radii of dopants and parent atoms induce remarkable local strains that severely limit the sizes of crystalline grains in thin films.Herein,FA has been introduced into Co-doped MAPbI3 to relax the local strains to improve the qualities of MAPbI3 thin films.Experimental and theoretical studies suggest that Co doping induced remarkable local tensile strains,which are effectively relaxed by doping FA.Further studies suggest that doping of FA decreases the boundary defects and tunes the Fermi energy of Co-doped MAPbI3 thin films simultaneously,which effectively suppresses non-radiative recombination and improves the carrier transport at MAPbI3/ITO interfaces.On these bases,efficient transport layer-free MAPbI3/ITO photodetectors with the responsivity and external quantum efficiency(EQE)as high as 0.094 A/W and 28%at zero bias have been achieved.These results have provided promising pathways for obtaining efficient transport-layer-free perovskite photodetectors in the future. 展开更多
关键词 Co doped Co-FA codoping strain relaxation efficient photodetection MAPbI3/ITO
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Enabling efficient near-infrared emission in leadfree double perovskite via a codoping strategy 认领 引用
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作者 Xiangyan Yun Hanlin Hu +3 位作者 Haizhe Zhong Jingheng Nie Henan Lie Yumeng Shi 《Inorganic Chemistry Frontiers》 SCIE EI 2024年第18期6146-6155,共10页
Metal halides show great promise as a new generation of near-infrared(NIR)light-emitting materials.Compared with other light-emitting materials,double perovskites possess structures with different dimensionalities,whi... Metal halides show great promise as a new generation of near-infrared(NIR)light-emitting materials.Compared with other light-emitting materials,double perovskites possess structures with different dimensionalities,which can support multiple emission centers,leading to varied photoluminescence.Among various doping centers,ytterbium(Ⅲ)(Yb3+)has attracted attention because of its unique twoenergy-level structure(2F5/2 and 2F7/2).However,the NIR emission of Yb3+remains unsatisfactory because of poor resonance energy transfer between Yb3+and sensitizers.Here,effective NIR-emitting lead-free perovskites are developed by co-doping antimony(Ⅲ)(Sb3+)and lanthanide(Ⅲ)ions into Cs2NaInCl6.Under excitation at 318 nm,Cs2NaInCl6:Sb3+/Yb3+showed a broadband NIR emission peak at 1001 nm,whereas Cs2NaInCl6:Sb3+/Nd3+exhibited three NIR emission peaks at 896,1077,and 1358 nm.The exciton dynamics of the materials were investigated.Experiments and density functional theory calculations revealed that the NIR emission of Yb3+originated from a charge-transfer state(CTS)and energy transfer,whereas that of Nd3+arose from resonance energy transfer.Profiting from the high-energy selftrapped exciton(STE)emission and CTS with Yb3+,a high photoluminescence quantum yield of 48.95%was realized.The excellent NIR luminescence performance combined with high environmental stability demonstrates the potential of these metal halides for use in night-vision technologies. 展开更多
关键词 codoping strategy ytterbium metal halides lead free double perovskite emission centersleading near infrared emission doping centersytterbium yb photoluminescence
Effect of N and Fe codoping on the electronic structure and optical properties of TiO_2 from first-principles study 认领 引用 被引量：3
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作者 祝卓茂 卞宝安 史海峰 《Journal of Semiconductors》 EI CAS CSCD 2015年第10期22-26,共5页
The electronic structure and optical properties of N and Fe codoping Ti02 have been investigated by first-principles calculations based on density functional theory. The calculated results indicate that the stability ... The electronic structure and optical properties of N and Fe codoping Ti02 have been investigated by first-principles calculations based on density functional theory. The calculated results indicate that the stability of N and Fe codoping TiO2 will change at different substitutional sites of N and Fe. The mechanism of band gap narrowing of doping Ti02 is discussed by investigating the density of state. The different substitutional site of N and Fe in codoping TiO2 influences the visible-light absorption. An increased visible-light absorption for doping TiO2 results from the synergistic effect of N and Fe codoping. Therefore, N and Fe codoping may enhance the visible-light photocatalytic activity of TiO2. 展开更多
关键词 codoping first-principle electronic structure optical properties
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Realization of quantum anomalous hall effect at tens of kelvin by n-p codoping of topological insulators 认领 引用
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《Science Foundation in China》 2016年第4期47-47,共1页
With the support by the National Natural Science Foundation of China,the research teams led by Prof.Xu Xiaohong（许小红）at the School of Chemistry and Materials Science,Shanxi Normal University and Prof.Zhang Zhenyu ... With the support by the National Natural Science Foundation of China,the research teams led by Prof.Xu Xiaohong（许小红）at the School of Chemistry and Materials Science,Shanxi Normal University and Prof.Zhang Zhenyu at ICQD,University of Science and Technology of China used vanadium-iodine（Ⅴ-Ⅰ）codoped Sb2Te3 to realize high-temperature quantum anomalous Hall effect（QAHE）,which was 展开更多
关键词 high Hall Realization of quantum anomalous hall effect at tens of kelvin by n-p codoping of topological insulators
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