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CSCD
Self-trapped excitons (STEs) emission from halide perovskites with strong exciton-phonon coupling has attracted considerable attention due to the widespread application in optoelectronic devices. Nevertheless, the in-depth understanding of the relationship between exciton-phonon coupling and luminescence intensity remains incomplete. Herein, a doping-enhanced exciton-phonon coupling effect is observed in Cs3Cu2I5 nanocrystals (NCs), which leads to a remarkable increasement of their STEs emission efficiency. Mechanism study shows that the hetero-valent substitution of Cu+ with alkaline-earth metal ions (AE2+) causes a greater degree of Jahn–Teller distortion between the ground state and excited state structures of [Cu2I5]3− clusters as evidenced by our spectral analysis and first-principles calculations. As a consequence, an X-ray detector based on these Cs3Cu2I5:AE NCs delivers an X-ray imaging resolution of up to 10 lp·mm−1 and a low detection limit of 0.37 μGyair·s−1, disclosing the potential of doping-enhanced exciton-phonon coupling effect in improving STEs-emission and practical application for X-ray imaging.
This work is supported by the Fund of Fujian Science & Technology Innovation Laboratory for Optoelectronic Information (Nos. 2020ZZ114 and 2022ZZ204), the Key Research Program of Frontier Science CAS (No. QYZDY-SSW-SLH025), the National Natural Science Foundation of China (Nos. 21731006 and 21871256), and the Fund of Advanced Energy Science and Technology Guangdong Laboratory (No. DJLTN0200/DJLTN0240).