Photoluminescent Spectral Broadening of Lead Halide Perovskite Nanocrystals Investigated by Emission Wavelength Dependent Lifetime

被引：9

作者：

Zhang, Jinlei ^{[1
]}

He, Jiuyang ^{[2
]}

Yang, Lun ^{[3
]}

Gan, Zhixing ^{[4
,5
]}

机构：

[1] Suzhou Univ Sci & Technol, Sch Math & Phys, Jiangsu Key Lab Micro & Nano Heat Fluid Flow Tech, Suzhou 215009, Peoples R China

[2] Xinjiang Normal Univ, Coll Phys & Elect Engn, Urumqi 830054, Peoples R China

[3] Hubei Normal Univ, Inst Adv Mat, Hubei Key Lab Pollutant Anal & Reuse Technol, Huangshi 435002, Hubei, Peoples R China

[4] Nanjing Normal Univ, Sch Phys & Technol, Jiangsu Key Lab Optoelect Technol, Nanjing 210023, Peoples R China

[5] Qingdao Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266042, Peoples R China

来源：

MOLECULES | 2020年 / 25卷 / 05期

基金：

中国国家自然科学基金;

关键词：

perovskite nanocrystals; photoluminescence; bandwidth; lifetime; LIGHT-EMITTING-DIODES; QUANTUM DOTS; SIZE; OPPORTUNITIES; LUMINESCENT; CHALLENGES; EXCITONS; BRIGHT; BR; CL;

D O I：

10.3390/molecules25051151

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Despite intensive efforts, the fluorescence of perovskite nanocrystals (NCs) still suffers from a poor color purity, which limits the applications in light emitting and multicolor display. A deep understanding on the fundamental of the photoluminescent (PL) spectral broadening is thus of great significance. Herein, the PL decay curves of the CsPbClxBr3-x NCs are monitored at different wavelengths covering the entire PL band. Moreover, energy relaxation time tau and radiative recombination time beta are obtained by numerical fittings. The dependences of tau and 1/beta on the detection wavelength agree well with the steady-state PL spectrum, indicating the observed PL broadening is an intrinsic effect due to the resonance and off-resonance exciton radiative recombination processes. This work not only provides a new analysis method for time-resolved PL spectra of perovskites, but also gains a deep insight into the spectral broadening of the lead halide perovskite NCs.

引用

页数：11

共 35 条

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