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

Molecules

Zhixing Gan¹  Jiuyang He²  Lun Yang³  Jinlei Zhang⁴ 

[1] Reuse Technology, Hubei Normal University, Huangshi 435002, China;College of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China;;Institute for Advanced Materials, Hubei Key Laboratory of Pollutant Analysis &Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China;

关键词: perovskite nanocrystals;    photoluminescence;    bandwidth;    lifetime;   

DOI  :  10.3390/molecules25051151

来源: DOAJ

【 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 CsPbCl_xBr_3-x NCs are monitored at different wavelengths covering the entire PL band. Moreover, energy relaxation time τ and radiative recombination time β are obtained by numerical fittings. The dependences of τ and 1/β 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.

【 授权许可】

Unknown