One-Dimensional Exciton-Luminescent Metal Halides for Efficient X-Ray Scintillation Imaging
Muyi Zhang a b, Guangda Niu b, Jiang Tang b
a Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
b Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China.
Proceedings of nanoGe Fall Meeting 2021 (NFM21)
#PerFun21. Perovskites I: Solar Cells, Lighting, and Related Optoelectronics
Online, Spain, 2021 October 18th - 22nd
Organizers: Eva Unger and Feng Gao
Poster, Muyi Zhang, 262
Publication date: 23rd September 2021

Perovskites are considered the most promising semiconductors in the field of optoelectronics. As perovskite-inspired materials, metal halides have attracted new-round attention. One of their interesting features is the efficient excitonic luminescence due to the low-dimensional structure. We develop the one-dimensional (1D) metal halides CsCu2I3 and Rb2AgBr3 with high luminescence capacity based on two different emission mechanisms, self-trapped exciton (STE) and defect-bound exciton (DBE) emission. These two exciton emissions make metal halides demonstrate bright luminescence and ultra-short decay time respectively, fulfilling the ideal request on static and dynamic X-ray scintillation imaging. On the other hand, the 1D structure enables the design of the oriented waveguide structure within the panel device, which could effectively reduce the optical crosstalk and enhance the imaging performance. Our works are eventually applied in the large-area panel X-ray detectors and realize the workable performance. Also, we preliminarily study the mechanism of DBE emission and hope to provide new thinking about the relationship between material property and device performance.

The authors thank the financial support of the Knut and Alice Wallenberg Foundation of Sweden, the Major State Basic Research Development Program of China, and the National Natural Science Foundation of China.

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