Ultrafast (600 ps) Vacuum‐UV Reflective Scintillation Enabled by Surface Exciton Recombination in Layered Perovskite PEA <sub>2</sub> PbBr <sub>4</sub>
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 PEA<sub>2</sub>PbBr<sub>4</sub>, 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.
Authors
- Cheng Lü (ORCID: https://orcid.org/0000-0002-5872-4461)
- Mingxi Hu (ORCID: https://orcid.org/0000-0002-3813-9222)
- Danwen Zhang (ORCID: https://orcid.org/0009-0006-9548-8425)
- Yang Liu (ORCID: https://orcid.org/0000-0002-9725-6007)
- Xiaoping Ouyang (ORCID: https://orcid.org/0000-0002-9443-1084)
- Wei Zheng (ORCID: https://orcid.org/0000-0003-4329-0469)
- Lixin Zhang (ORCID: https://orcid.org/0000-0001-8367-6935)
- Xiaoyu Song (ORCID: https://orcid.org/0000-0002-4797-7367)
- Siqi Zhu (ORCID: https://orcid.org/0000-0003-1113-8294)
- Xin Zhang (ORCID: https://orcid.org/0000-0001-6036-2685)
Institutions
- North China Electric Power University (CN)
- Sun Yat-sen University (CN)
- Vision Technology (United States) (US)
- Northwest Institute of Nuclear Technology (CN)
- Shenzhen Technology University (CN)
Publication Details
- Journal
- Angewandte Chemie International Edition
- Published
- 2025-06-18
- DOI
- https://doi.org/10.1002/anie.202505665
- Citations
- 6
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 4.38
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China