Solvent‐Mediated Structural and Luminescence Diversification of Organic Copper(I) Halides
Yuming Sun, Ziqi Yu, Zixian Li, Zhaoyang Hu, Yushuang Li, Qiying Wang, Xiaowu Lei, Lingyan Wang, Zhiwei Chen, Chengyang YueABSTRACT
Low‐dimensional organic‐inorganic hybrid halides have emerged as a new kind of promising scintillators owing to their high light output and tunable emission across the full visible spectrum. Exploration of new Cu‐based halides for x‐ray applications has become a current research hotspot. Herein, we performed a solvent‐mediated structural design strategy and prepared two new Cu(I)‐based halides of (AEMP) 4 [Cu 2 Br 6 ] 3 and (AEMP)[Cu 3 Br 6 ]·H 2 O (AEMP = 1‐(2‐Aminoethyl)‐4‐Methyl‐Piperazine), in a system. Interestingly, (AEMP) 4 [Cu 2 Br 6 ] 3 contains 0D [Cu 2 Br 6 ] 4− dimer, while (AEMP)[Cu 3 Br 6 ]·H 2 O is composed of 1D [Cu 3 Br 6 ] 3− chain building from corner‐shared [Cu 3 Br 6 ] trimers. In contrast to unstable (AEMP) 4 [Cu 2 Br 6 ] 3 , (AEMP)[Cu 3 Br 6 ]·H 2 O exhibits stable and highly efficient photoluminescence and radioluminescence emission with a near‐unity photoluminescence quantum yield of 99.45% and a promising radioluminescence light yield of 27,185 photons MeV −1 , respectively. Meanwhile, the detection limit of 66.31 n Gy air s −1 is much lower than the x‐ray dose required for diagnosis (5.5 µ Gy air s −1 ). A flexible film with excellent foldability and crack resistance was fabricated for x‐ray imaging, which achieves a high spatial resolution of 10 lp mm −1 . Combining multiple advantages, including low cost, high luminescence efficiency, and excellent scintillation performance, enable this cuprous halide to stand out as a promising x‐ray scintillator.