摘要
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.
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.
作者
Byung-Ryool Hyun
Mikita Marus
钟华英
李德鹏
刘皓宸
谢阅
Weon-kyu Koh
徐冰
刘言军
孙小卫
Byung-Ryool Hyun;Mikita Marus;Huaying Zhong;Depeng Li;Haochen Liu;Yue Xie;Weon-kyu Koh;Bing Xu;Yanjun Liu;Xiao Wei Sun(Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting,Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting,Department of Electrical&Electronic Engineering,Southern University of Science and Technology,Shenzhen 518055,China;School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore;Shenzhen Planck Innovation Technologies Co.Ltd,Shenzhen 518112,China)
基金
Project supported by the National Key Research and Development Program of China(Grant No.2016YFB0401702)
the National Natural Science Foundation of China(Grant Nos.61674074 and 61405089)
Development and Reform Commission of Shenzhen Project,China(Grant No.[2017]1395)
Shenzhen Peacock Team Project,China(Grant No.KQTD2016030111203005)
Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting,China(Grant No.ZDSYS201707281632549)
Guangdong Province’s Key R&D Program:Micro-LED Display and Ultra-high Brightness Micro-display Technology,China(Grant No.2019B010925001)
Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting,China(Grant No.2017KSYS007)
Distinguished Young Scholar of National Natural Science Foundation of Guangdong,China(Grant No.2017B030306010)
the start-up fund from Southern University of Science and Technology,Shenzhen,China
