Organo-Metal Halide Scintillator with Weak Thermal Quenching Up to 200 °C

Summary, in English

The prominent thermal quenching (TQ) effect of organic-inorganic metal halides limits their applications for lighting and imaging. Herein, we report an organo-metal halide scintillator (TTPhP)₂MnCl₄(TTPhP⁺= tetraphenylphosphonium cation), which exhibits a weak TQ effect up to 200 °C under ultraviolet-visible light (efficiency loss of 5.5%) and X-ray radiation (efficiency loss of 37%). The light yield of the (TTPhP)₂MnCl₄scintillator (37 »000 photons MeV^-1at 200 °C) under X-ray radiation is >2 times that of the commercial scintillator LuAG:Ce (15 »000 photons MeV^-1at 200 °C). The microscopic mechanism of the weak TQ effect is demonstrated to be the scintillator having the ability to compensate for the emission losses from trapped charges and the large Mn-Mn distance (10.233 Å) suppressing nonradiative recombination at high temperatures. We further demonstrate the applications of (TTPhP)₂MnCl₄as high-power white-light-emitting diodes operated at currents of ≤300 mA and X-ray imaging at 200 °C with a high spatial resolution.

• Author: Yanqing Wu; Junsheng Chen; Daoyuan Zheng; Xusheng Xia; Songqiu Yang; Yang Yang; Jiaxin Chen; Tõnu Pullerits; Keli Han; Bin Yang
• Department/s: LTH Profile Area: Photon Science and Technology; LTH Profile Area: Nanoscience and Semiconductor Technology; Chemical Physics; NanoLund: Centre for Nanoscience
• Publishing year: 2022-06-30
• Language: English
• Pages: 5794-5800
• Publication/Series: Journal of Physical Chemistry Letters
• Volume: 13
• Issue: 25
• Links: http://dx.doi.org/10.1021/acs.jpclett.2c01573
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Atom and Molecular Physics and Optics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1948-7185