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Abstract Organic‐inorganic hybrid cuprous halides (OHCHs) are intriguing candidates for the next generation of scintillators due to their environmental friendliness, simple preparation, and excellent luminescent properties. Herein, a series of efficient OHCHs based on inorganic building blocks Cu 4 Br 6 2− clusters, designated as (TMAA) 2 Cu 4 Br 6 , (EtTPPh) 2 Cu 4 Br 6 , and (MtTBA) 2 Cu 4 Br 6 (TMAA = N,N,N ‐trimethyltrimethyl‐1‐adamantylammonium; EtTPPh = ethyltriphenylphosphonium; MtTBA = methyltri‐n‐butylammonium), are synthesized via a simple solution method. The three OHCHs exhibit broadband yellow emissions. Remarkably, the 0D (TMAA) 2 Cu 4 Br 6 shows a near‐unity photoluminescence quantum yield, which can be attributed to the highly localized excitons and rigid environment. Impressively, it is demonstrated to show excellent scintillation performance with a high light yield of 46700 photon MeV −1 and a low detection limit of 56.12 nGy air s −1 . Photophysical studies reveal that the bright emission in (TMAA) 2 Cu 4 Br 6 originates from self‐trapped excitons. This work opens an inspirational avenue in structure design for OHCHs as high‐performance X‐ray scintillators.
Zhu et al. (Thu,) studied this question.