Highly Resolved X‐Ray Imaging Enabled by In(I) Doped Perovskite‐Like Cs3Cu2I5 Single Crystal Scintillator. Issue 11 (11th April 2022)

• Record Type: Journal Article
• Authors: Wang, Qian; Zhou, Quan; Nikl, Martin; Xiao, Jiawen; Kucerkova, Romana; Beitlerova, Alena; Babin, Vladimir; Prusa, Petr; Linhart, Vladimir; Wang, Jingkang; Wen, Xuemin; Niu, Guangda; Tang, Jiang; Ren, Guohao; Wu, Yuntao
• Is Part Of: Advanced optical materials. Volume 10:Issue 11(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-11
• Subjects: low‐dimensional perovskite -- scintillator -- single crystal -- X‐ray imaging; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202200304
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Low‐dimensional perovskite halides have shown a great potential as X‐ray detection materials because of efficient exciton emissions originating from strongly spatially localized charge carriers. Nonetheless, most of them have a scintillation yield far below their theoretical limits. Here, it is found that the harvesting efficiency of produced charge carriers can be significantly enhanced via a small amount of In + doping in these highly localized structures. A bright and sensitive zero‐dimensional Cs3 Cu2 I5 :In + halide with efficient and tunable dual emission is reported. The radioluminescence emission of Cs3 Cu2 I5 :In + crystals under X‐ray excitation consists of a self‐trapped exciton emission at 460 nm and an In + ‐related emission at 620 nm at room temperature. In + doping enhances the photoluminescence quantum efficiency (PLQY) of Cs3 Cu2 I5 from 68.1% to 88.4%. Benefiting from the higher PLQY, Cs3 Cu2 I5 :In + can achieve an excellent X‐ray detection limit of 96.2 nGyair s −1, and a superior scintillation yield of 53 000 photons per MeV, which is comparable to commercial CsI:Tl single crystals. As a result, a remarkable X‐ray imaging resolution of 18 line pairs mm –1 is demonstrated, which is so far a record resolution for single crystal perovskite‐based flat‐panel detectors. These results highlight the importance of efficient harvesting of carriers (and excitons) in low‐dimensional perovskites for radiation detection applications. Abstract : A remarkable X‐ray imaging resolution of 18 line pairs mm −1 is demonstrated by using bright and sensitive zero‐dimensional Cs3 Cu2 I5 :In + single‐crystal scintillators, which is so far a record resolution for single‐crystal perovskite scintillator‐based flat‐panel detectors. The result highlights the importance of efficient harvesting of carriers (and excitons) in low‐dimensional perovskites for efficient radiation detection applications.