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

• Published in: Physical chemistry chemical physics : PCCP Vol. 22; no. 13; pp. 697 - 6974
• Main Authors: Shao, Wenyi, Li, Yang, Wang, Xiang, Ouyang, Xiao, Cai, Jiafa, Li, Chen, Ouyang, Xiaoping, Wu, Zhengyun, Xu, Qiang
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 07.04.2020
• Subjects: Carrier transport; Crystal lattices; Crystals; Diffraction patterns; Emitters; Energy gap; Heterostructures; Light emission; Optical properties; Perovskites; Photoluminescence; Radiative recombination; Scintillation counters; Single crystals; Spectral emittance
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c9cp06259a

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 CH 3 NH 3 (MA)PbCl 3 /CH 3 NH 3 (MA)PbBr x Cl 3− 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. Halide funnel-typed perovskite materials have been synthesized by simply solution-processed method. This gradient heterostructure materials have been investigated that helpful for charges radiative recombination and suppress non-radiative recombination in the interfaces.