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

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Jinlei ZhangZhixing Gan

Abstract

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 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.

References

Nov 18, 2015·Advanced Materials·Yichuan LingHanwei Gao
Dec 17, 2015·Journal of the American Chemical Society·Yehonadav BekensteinA Paul Alivisatos
Jan 9, 2016·Science·David P McMeekinHenry J Snaith
Feb 11, 2016·The Journal of Physical Chemistry Letters·Rachel E BealMichael D McGehee
Jun 21, 2016·Journal of the American Chemical Society·Jacob B HoffmanPrashant V Kamat
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Oct 12, 2017·ACS Nano·Claudiu M IaruAndrei Yu Silov
Feb 21, 2018·Nature Materials·Quinten A AkkermanLiberato Manna

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