Highly fluorescent CsPbBr3/TiO2 core/shell perovskite nanocrystals with excellent stability

被引：17
作者：
Chen, Haitao [1 ,2 ,3 ]
Li, Renhua [1 ,3 ]
Guo, Anqi [1 ,3 ]
Xia, Yu [1 ,3 ]
机构：
[1] Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225002, Peoples R China
[2] Nanjing Univ, Natl Lab Solid State Microstruct, Lab Modern Acoust, MOE, Nanjing 210093, Peoples R China
[3] China Resources Microelect Co Ltd, 14 Liangxi Rd, Wuxi 214061, Peoples R China
来源：
SN APPLIED SCIENCES | 2021年 / 3卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Perovskite nanocomposites; Photostability; Optical properties; TUNABLE PHOTOLUMINESCENCE; THERMAL-STABILITY; CSPBX3; X; BR;
D O I：
10.1007/s42452-021-04648-8
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The poor stability of CsPbX3 (X=Cl, Br, I) perovskite nanocrystals is the most impediment to its application in the field of photoelectrics. In this work, monodisperse CsPbBr3/TiO2 nanocrystals are successfully prepared by coating titanium precursor on the surface of colloidal CsPbBr3 nanocrystals at room temperature. The CsPbBr3/TiO2 nanocomposites exhibit excellent stability, remaining the identical particle size (9.2 nm), crystal structures and optical properties. Time-resolved photoluminescence decay shows that the lifetime of CsPbBr3/TiO2 nanocrystals is about 4.04 ns and keeps great stability after lasting two months in the air. Results show that the coating of TiO2 on CsPbBr3 NCs greatly suppressed the anion exchange and photodegradation, which are the main reasons for dramatically improving their chemical stability and photostability. The results provide an effective method to solve the stability problem of perovskite nanostructures and are expected to have a promising application in optoelectronic fields
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页数：7
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