Stable and Efficient Blue-Emitting CsPbBr3 Nanoplatelets with Potassium Bromide Surface Passivation

被引:1
|
作者
Lin, Hao [1 ,2 ]
Wei, Qi [1 ]
Ng, Kar Wei [1 ]
Dong, Jia-Yi [1 ]
Li, Jie-Lei [1 ]
Liu, Wei-Wei [1 ]
Yan, Shan-Shan [1 ]
Chen, Shi [1 ]
Xing, Gui-Chuan [1 ]
Tang, Xiao-Sheng [2 ]
Tang, Zi-Kang [1 ]
Wang, Shuang-Peng [1 ]
机构
[1] Univ Macau, Inst Appl Phys & Mat Engn, Taipa 999078, Macao, Peoples R China
[2] Chongqing Univ, Key Lab Optoelect Technol & Syst, Minist Educ, Chongqing 400044, Peoples R China
关键词
CsPbBr; (3) nanoplates; potassium bromide; stability; surface passivation; white light-emitting diodes; PEROVSKITE SOLAR-CELLS; LARGE-SCALE SYNTHESIS; HALIDE PEROVSKITES; HYBRID PEROVSKITE; LIGHT; DIODES; TRANSFORMATION; LUMINESCENCE;
D O I
10.1002/smll.202101359
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Colloidal all-inorganic perovskites nanocrystals (NCs) have emerged as a promising material for display and lighting due to their excellent optical properties. However, blue emissive NCs usually suffer from low photoluminescence quantum yields (PLQYs) and poor stability, rendering them the bottleneck for full-color all-perovskite optoelectronic applications. Herein, a facile approach is reported to enhance the emission efficiency and stability of blue emissive perovskite nano-structures via surface passivation with potassium bromide. By adding potassium oleate and excess PbBr2 to the perovskite precursor solutions, potassium bromide-passivated (KBr-passivated) blue-emitting (approximate to 450 nm) CsPbBr3 nanoplatelets (NPLs) is successfully synthesized with a respectably high PLQY of 87%. In sharp contrast to most reported perovskite NPLs, no shifting in emission wavelength is observed in these passivated NPLs even after prolonged exposures to intense irradiations and elevated temperature, clearly revealing their excellent photo- and thermal-stabilities. The enhancements are attributed to the formation of K-Br bonding on the surface which suppresses ion migration and formation of Br-vacancies, thus improving both the PL emission and stability of CsPbBr3 NPLs. Furthermore, all-perovskite white light-emitting diodes (WLEDs) are successfully constructed, suggesting that the proposed KBr-passivated strategy can promote the development of the perovskite family for a wider range of optoelectronic applications.
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页数:10
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