# Improvement of Light Output of MAPbBr3 Single Crystal for Ultrafast and Bright Cryogenic Scintillator

## TL;DR

This paper shows how optimizing the synthesis of MAPbBr3 single crystals improves their scintillation performance at low temperatures, making them suitable for X-ray timing applications.

## Contribution

The study introduces a synthesis method that enhances the light output and speed of MAPbBr3 scintillators at cryogenic temperatures.

## Key findings

- THF-0.4M SCs show over 2-fold higher radioluminescence light yield than Control-1M SCs.
- THF-0.4M SCs have an ultrafast decay component of 0.52 ns (82.2%) at low temperatures.
- The improved scintillation properties make THF-0.4M SCs ideal for X-ray timing applications.

## Abstract

The remarkable brightness
and rapid scintillation observed
in perovskite
single crystals (SCs) become even more striking when they are operated
at cryogenic temperatures. In this study, we present advancements
in enhancing the scintillation properties of methylammonium lead bromide
(MAPbBr3) SCs by optimizing the synthesis process. We successfully
synthesized millimeter-sized MAPbBr3 SCs with bright green
luminescence under UV light. However, both MAPbBr3 (Control-1M
and THF-0.4M) SCs display notable radioluminescence exclusively at
low temperatures due to their phase transitions. Notably, the THF-0.4M
SCs exhibit a remarkable improvement in radioluminescence light yield,
surpassing Control-1M SCs more than 2-fold. Further, THF-0.4M SCs
demonstrate an ultrafast decay component of 0.52 ns (82.2%) and a
slower component of 1.80 ns (17.8%), contributing to a rapid scintillation
response at low temperatures. Therefore, the amalgamation of ultrafast
decay components and improved radioluminescence light yield equips
THF-0.4M SCs to emerge as a top choice for perovskite scintillators
for X-ray timing applications.