Gradient heterostructure perovskite single crystals enable the improvement of radiative recombination for scintillator application
Wenyi Shao, Yang Li, Xiang Wang, Xiao Ouyang, Jiafa Cai, Chen Li, Xiaoping Ouyang, Zhengyun Wu, Qiang Xu
Abstract
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.