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Gradient heterostructure perovskite single crystals enable the improvement of radiative recombination for scintillator application

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Abstract

Recently, organic–inorganic hybrid perovskites (OIHPs) are rising as promising candidates for light-emitting applications, due to their superior optical properties. High performance light-emitting applications such as scintillators require minimum non-radiative recombination and high fractions of radiative recombination. Here, we report a simple solution-processing strategy for the synthesis of funnel-type CH3NH3(MA)PbCl3/CH3NH3(MA)PbBrxCl3−x heterostructure perovskite materials that improve the light emission performances. The single crystal X-ray diffraction pattern indicates that the lattice mismatch is only ∼3.24% in the heterointerface. The halide gradient is helpful for driving the photoexcited carriers from the internal high bandgap material to the low bandgap light-emitter layer. The steady-state photoluminescence (PL) and radioluminescence (RL) spectra show that the luminescence intensity has been significantly improved by this heterostructure perovskite. Time-resolved photoluminescence (TRPL) exhibits carrier transport along the halide gradient. Our research suggests that the gradient halide perovskite heterostructure with specific optical properties could be a prospect for commercial scintillator applications.

Graphical abstract: Gradient heterostructure perovskite single crystals enable the improvement of radiative recombination for scintillator application

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Article information


Submitted
19 Nov 2019
Accepted
25 Feb 2020
First published
25 Feb 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Gradient heterostructure perovskite single crystals enable the improvement of radiative recombination for scintillator application

W. Shao, Y. Li, X. Wang, X. Ouyang, J. Cai, C. Li, X. Ouyang, Z. Wu and Q. Xu, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP06259A

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