Danwen Zhang, Lu Cheng, Xiaoyu Song, Xin Zhang, Lixin Zhang, Siqi Zhu, Mingxi Hu, Yang Liu, Xiaoping Ouyang, Prof. Wei Zheng
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Ultrafast (600 ps) Vacuum-UV Reflective Scintillation Enabled by Surface Exciton Recombination in Layered Perovskite PEA2PbBr4
Vacuum ultraviolet (VUV) photodetection is pivotal for space exploration and radiation monitoring, yet its dynamic imaging capability is significantly hindered by the slow response of conventional scintillators. However, existing scintillators exhibit microsecond-to-nanosecond decay time, failing to meet sub-nanosecond ultrafast imaging demands. Here, we uncovered a surface exciton recombination mechanism in layered perovskite PEA2PbBr4, where lattice contraction induced exciton localization, achieving ultrafast decay time of 600 ps—over 100-fold faster than commercial scintillation. A reflective optical configuration was designed to suppress self-absorption, improving the light utilization efficiency. This work established a material paradigm for ultrafast dynamic imaging and opens avenues for advancing space science and high-energy physics detection.
期刊介绍：
Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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