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Infrared light-emitting diodes based on colloidal Pb Se/Pb S core/shell nanocrystals 认领 引用 被引量：1
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作者 Byung-Ryool Hyun Mikita Marus +7 位作者 Huaying Zhong Depeng Li Haochen Liu Yue Xie Weon-kyu Koh Bing Xu Yanjun Liu Xiao Wei Sun 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第1期482-488,共7页
Colloidal Pb Se nanocrystals(NCs)have gained considerable attention due to their efficient carrier multiplication and emissions across near-infrared and short-wavelength infrared spectral ranges.However,the fast degra... Colloidal Pb Se nanocrystals(NCs)have gained considerable attention due to their efficient carrier multiplication and emissions across near-infrared and short-wavelength infrared spectral ranges.However,the fast degradation of colloidal Pb Se NCs in ambient conditions hampers their widespread applications in infrared optoelectronics.It is well-known that the inorganic thick-shell over core improves the stability of NCs.Here,we present the synthesis of Pb Se/Pb S core/shell NCs showing wide spectral tunability,in which the molar ratio of lead(Pb)and sulfur(S)precursors,and the concentration of sulfur and Pb Se NCs in solvent have a significant effect on the efficient Pb S shell growth.The infrared light-emitting diodes(IR-LEDs)fabricated with the Pb Se/Pb S core/shell NCs exhibit an external quantum efficiency(EQE)of 1.3%at 1280 nm.The ligand exchange to optimize the distance between NCs and chloride treatment are important processes for achieving high performance on Pb Se/Pb S NC-LEDs.Our results provide evidence for the promising potential of Pb Se/Pb S NCs over the wide range of infrared optoelectronic applications. 展开更多
关键词 Pb Se/Pb S core/shell nanocrystal ligand exchange infrared light-emitting diodes external quantum efficiency
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Colloidal synthesis of lead chalcogenide/lead chalcohalide core/shell nanostructures and structural evolution 认领 引用 被引量：2
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作者 Yang Liu Kunyuan Lu +11 位作者 Yujie Zhu Xudong Hu Yusheng Li Guozheng Shi Xingyu Zhou Lin Yuan Xiang Sun Xiaobo Ding Irfan Ullah Muhammad Qing Shen Zeke Liu Wanli Ma 《Journal of Semiconductors》 EI CAS CSCD 2025年第4期38-44,共7页
Lead chalcohalides(PbYX,X=Cl,Br,I;Y=S,Se)is an extension of the classic Pb chalcogenides(PbY).Constructing the heterogeneous integration with PbYX and PbY material systems makes it possible to achieve significantly im... Lead chalcohalides(PbYX,X=Cl,Br,I;Y=S,Se)is an extension of the classic Pb chalcogenides(PbY).Constructing the heterogeneous integration with PbYX and PbY material systems makes it possible to achieve significantly improved optoelectronic performance.In this work,we studied the effect of introducing halogen precursors on the structure of classical PbS nanocrystals(NCs)during the synthesis process and realized the preparation of PbS/Pb3S2X2 core/shell structure for the first time.The core/shell structure can effectively improve their optical properties.Furthermore,our approach enables the synthesis of Pb3S2Br2 that had not yet been reported.Our results not only provide valuable insights into the heterogeneous integration of PbYX and PbY materials to elevate material properties but also provide an effective method for further expanding the preparation of PbYX material systems. 展开更多
关键词 lead chalcohalides lead chalcogenides PbS nanocrystal core/shell structure Pb3S2X2nanocrystal
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Continuous flow synthesis of PbS/CdS quantum dots using substituted thioureas 认领 引用
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作者 Pierre Machut Anna Karina Antonini +5 位作者 Céline Rivaux Marina Gromova Harinderbir Kaur Wai Li Ling Gabriel Mugny Peter Reiss 《Nano Research》 SCIE EI CSCD 2024年第12期10677-10684,共8页
To enhance the reproducibility and scale up the synthesis of colloidal quantum dots(QDs),continuous flow synthesis is an appealing alternative to the widely used batch synthesis.Amongst other advantages,the strongly e... To enhance the reproducibility and scale up the synthesis of colloidal quantum dots(QDs),continuous flow synthesis is an appealing alternative to the widely used batch synthesis.Amongst other advantages,the strongly enhanced heat and mass transfer in small tubular reactors combined with controlled pressure can be cited.Nonetheless,the widespread use of this technique is hampered by special requirements such as the absence of solid or gaseous products and the room-temperature solubility of precursors.Therefore,the transfer of established reaction conditions from batch to flow is not straightforward and in most reported works the optical properties of the obtained QDs lag behind those prepared in batch reactions.This is also the case for PbS-based QDs,which are established near infrared(NIR)absorbers/emitters.Here we identified experimental conditions giving access to high-quality PbS core and PbS/CdS core/shell QDs obtained in an automated,easily scalable continuous flow synthesis.In particular,substituted thioureas have been selected as the sulfur source and ex-situ synthesized lead and cadmium oleate as the metal precursors,and appropriate solvent mixtures have been identified for each precursor.Highly luminescent PbS/CdS QDs emitting at the target wavelengths 940 and 1130 nm of special interest for NIR light-emitting diodes have been prepared,exhibiting a photoluminescence quantum yield up to 91%. 展开更多
关键词 quantum dots continuous flow synthesis thioureas PbS/CdS core/shell nanocrystals quantum dots based light-emittingdiodes(QLEDs)
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