Achieving Ultrahigh Photoluminescence Quantum Yield in Highly Stable Cs3Cu2I5 Perovskite Single Crystals Through Melt Growth

Weina Nan, Liang Zhang, Sijia Li, Peng Jin, Boru Zhou, Ziang Yin, Tao Wang, Ning Ye, Zhanggui Hu, Yicheng Wu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Low-dimensional halide perovskites Cs3Cu2I5 have garnered increasing attention for their exceptional luminescent properties, attributed to their stability, high photoluminescence quantum yield (PLQY), and scintillation efficiency. Here, we report the growth of transparent Cs3Cu2I5 crystals via the Bridgman method, emphasizing precise control of melt stoichiometry for optimal performance. Through melt composition optimization, significant improvements in crystal clarity and structural integrity were achieved, enhancing transmittance from 30% to over 80% and achieving nearly 100% PLQY. Notably, it exhibited self-absorption-free behavior due to a large Stokes shift of 1.15 eV, indicative of a substantial exciton binding energy (383 meV) associated with exciton self-trapping. Lastly, under 241Am γ-ray irradiation at 59.5 keV, the energy resolution improved to 14.9% with the transparent Cs3Cu2I5 crystals, demonstrating its potential for high-performance scintillation applications.

Original languageEnglish
Pages (from-to)23691-23697
Number of pages7
JournalInorganic Chemistry
Volume63
Issue number50
DOIs
StatePublished - 16 Dec 2024

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