Positive Effects of a Perovskite Film on the Radioluminescence Properties of a ZnO:Ga Crystal Scintillator.

Shiyi He,Tong Jin,Linyue Liu,Xiaoping Ouyang,Yang Li,Jinlu Ruan,Liang Chen

doi:10.3390/ma15041487

Abstract

To improve the radioluminescence (RL) performance of ZnO:Ga (GZO) crystal scintillators and overcome the challenge of their self-absorption, we proposed a two-layer composite scintillator consisting of a GZO wafer and a 70 nm lead halide perovskite film(CsPbBr3, CH3NH3PbBr3). The effects of the perovskite film on the RL properties were studied. The results showed that the perovskite quantum dot film substantially changed the RL spectrum of GZO and prevented self-absorption. The RL of the samples were enhanced by 66% to 151% through the photoluminescence (PL) of the perovskite film, while the energy-resolving power and spatial-resolving power were maintained at the same level as that of GZO image converters. The present experiments and discussions confirmed that the perovskite film improved the RL, and this study suggests a new wavelength regulation method among scintillators, converters, and back-end optical devices. The applications of perovskites in the field of radiation detection and imaging have been extended.

Highlights

X-ray diffraction (XRD) patterns were measured through a diffractometer (Ultima IV, Rigaku, Tokyo, Japan) equipped with a Cu Kα X-ray tube (λ = 0.154 nm)
To improve the RL performance of GZO crystal scintillators and overcome their selfabsorption problem, a piece of lead halide perovskite (CsPbBr3, MAPbBr3 ) film was spincoated on the surface
The enhancement on RL brought by perovskite film was higher than the reported results of nanoimprint (30%) and photonic crystal (59~84%)

Summary

Introduction

Academic Editor: Efrat LifshitzOrganic–inorganic halide perovskites, a class of materials with great potential in both the semiconductor and scintillator communities [1,2], have been applied in various scientific research fields, such as optical communication, solar cells, sensing, radiation detection, and imaging [3,4,5,6].As scintillator materials, perovskites effectively absorb light in a wide range from the ultraviolet to the visible and near-infrared region [7] and yield light of various wavelengths.In previous works [8,9], the absorption efficiency of lead halide perovskites for 250 nm to 450 nm light was over 97%. Organic–inorganic halide perovskites, a class of materials with great potential in both the semiconductor and scintillator communities [1,2], have been applied in various scientific research fields, such as optical communication, solar cells, sensing, radiation detection, and imaging [3,4,5,6]. Perovskites effectively absorb light in a wide range from the ultraviolet to the visible and near-infrared region [7] and yield light of various wavelengths. In previous works [8,9], the absorption efficiency of lead halide perovskites for 250 nm to 450 nm light was over 97%. When excited by an X-ray beam, perovskites can yield color-tunable emissions Large absorption coefficients indicated that a hundrednanometer layer of perovskite was sufficient for almost complete light absorption.

Methods

Results

Discussion

Conclusion