Mahato Somnath, Makowski Michal, Bose Shaona, Kowal Dominik, Kuddus Sheikh Md Abdul, Braueninger-Wemer Philipp, Witkowski Marcin E, Ray Samit Kumar, Drozdowski Winicjusz, Birowosuto Muhammad Danang
Lukasiewicz Research Network - PORT Polish Center for Technology Development, Wroclaw 54-066, Poland.
Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur-721 302, India.
J Phys Chem Lett. 2024 Apr 11;15(14):3713-3720. doi: 10.1021/acs.jpclett.4c00379. Epub 2024 Mar 28.
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 (MAPbBr) SCs by optimizing the synthesis process. We successfully synthesized millimeter-sized MAPbBr SCs with bright green luminescence under UV light. However, both MAPbBr (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.
当钙钛矿单晶（SCs）在低温下运行时，其显著的亮度和快速闪烁现象变得更加引人注目。在本研究中，我们展示了通过优化合成工艺来增强甲基溴化铅（MAPbBr）SCs闪烁性能的进展。我们成功合成了毫米级的MAPbBr SCs，在紫外光下发出明亮的绿色荧光。然而，由于其相变，MAPbBr（Control - 1M和THF - 0.4M）SCs仅在低温下显示出显著的放射性发光。值得注意的是，THF - 0.4M SCs在放射性发光光产额方面有显著提高，比Control - 1M SCs高出两倍多。此外，THF - 0.4M SCs表现出0.52 ns（82.2%）的超快衰减成分和1.80 ns（17.8%）的较慢成分，这有助于在低温下实现快速闪烁响应。因此，超快衰减成分和改进的放射性发光光产额的结合使THF - 0.4M SCs成为用于X射线计时应用的钙钛矿闪烁体的首选。
