Metal halide perovskite nanocrystals for x-ray scintillators

Abstract

Radiation detection, converting high-energy (keV) photons to lower energy (1.7-3 eV) photons, is of great importance in various fields, including medical diagnostics, quality inspection, and security checking. High-resolution scintillation imaging based on lead halide perovskite nanocrystals is very promising for these applications owing to their high absorption cross-section for X-rays, fast decay time, room temperature fabrication, tunable bandgap, low trap density, and near-unity photoluminescence quantum yield. Although considerable achievements have been obtained, challenges remain for future industrialization. Herein, the progress of scintillators based on lead halide perovskite nanocrystals is reviewed, including their working mechanism, key parameters, and the relationship between growth condition and performance. An overview of the current state of the art in this promising research area toward high-performance X-ray scintillators is provided, along with a look at some of the challenges and opportunities that lie ahead.

Nanocrystalline Lead Halide Perovskites to Boost Time‐of‐Flight Performance of Medical Imaging Detectors

“…[ 12,13 ] Especially bromides have also been extensively studied as scintillators, with a focus on their application as scintillating screens for low‐energy imaging techniques. [ 14 ]…”

“…[12,13] Especially bromides have also been extensively studied as scintillators, with a focus on their application as scintillating screens for low-energy imaging techniques. [14] Recently, given the very fast emission with sub-nanosecond decay time components, their use to improve the timing performance of radiation detectors is been investigated for various applications, including both medical imaging and high energy physics experiments. [15,16] In this case, the main drawback is the need for macroscopic (cm 3 -scale) large detectors in order to achieve a reasonable stopping power.…”

Thermally Activated Delayed Fluorescence Triplet State Excitons for High‐Performance Organic Photodetectors: A Novel Strategy

“…In high-performance OPDs, efficient PL perovskite materials are widely utilized, [22,[25][26][27] whereas highly quantum-efficient PL TADFs have not yet been explored. Furthermore, the extraction and population of triplet-state excitons in TADFs is a desirable but understudied aspect of photodetectors.…”