Sub-Nanosecond 2D Perovskite Scintillators by Dielectric Engineering

Sub-Nanosecond 2D Perovskite Scintillators by Dielectric Engineering

© 2023 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 35(2023), 18 vom: 14. Mai, Seite e2211769
1. Verfasser: Xia, Mengling (VerfasserIn)
Weitere Verfasser: Xie, Zuoxiang, Wang, Hanqi, Jin, Tong, Liu, Linyue, Kang, Jun, Sang, Ziru, Yan, Xianchang, Wu, Boning, Hu, Hao, Tang, Jiang, Niu, Guangda
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2023
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article 2D perovskite dielectric engineering sub-nanosecond scintillator ultrafast scintillator π-conjugated molecule
Beschreibung
Zusammenfassung:© 2023 Wiley-VCH GmbH.
Perovskite materials have demonstrated great potential for ultrafast scintillators with high light yield. However, the decay time of perovskite still cannot be further minimized into sub-nanosecond region, while sub-nanosecond scintillators are highly demanded in various radiation detection, including high speed X-ray imaging, time-of-flight based tomography or particle discrimination, and timing resolution measurement in synchrotron radiation facilities, etc. Here, a rational design strategy is showed to shorten the scintillation decay time, by maximizing the dielectric difference between organic amines and Pb-Br octahedral emitters in 2D organic-inorganic hybrid perovskites (OIHP). Benzimidazole (BM) with low dielectric constant inserted between [PbBr6 ]2- layers, resulting in a surprisingly large exciton binding energy (360.3 ± 4.8 meV) of 2D OIHP BM2 PbBr4 . The emitting decay time is shortened as 0.97 ns, which is smallest among all the perovskite materials. Moreover, the light yield is 3190 photons MeV-1 , which is greatly higher than conventional ultrafast scintillator BaF2 (1500 photons MeV-1 ). The rare combination of ultrafast decay time and considerable light yield renders BM2 PbBr4 excellent performance in γ-ray, neutron, α-particle detection, and the best theoretical coincidence time resolution of 65.1 ps, which is only half of the reference sample LYSO (141.3 ps)
Beschreibung:Date Completed 07.05.2023
Date Revised 07.05.2023
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202211769