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- Title
Efficient White Light-Emitting Diodes Based on Cu(I) Activated Single-Phase Halide Single Crystals.
- Authors
Shuangliang Cheng; Beitlerova, Alena; Kucerkova, Romana; Nikl, Martin; Buryi, Maksym; Chongyun Shao; Guohao Ren; Yuntao Wu
- Abstract
Single-phase white light emitters have become a potential substitute for tricolor phosphor mixtures for the white light-emitting diodes (WLEDs) application to simplify device structure and eliminate self-absorption. Newly developed lowdimensional halides, noted for their highly efficient luminescent characteristics, have seen increasing interest in recent years. Herein, highly efficient white-light emission is demonstrated in single-phase zero-dimensional halide single crystal, namely monovalent Cu-doped Cs2HfCl6. Cs2HfCl6:Cu single crystals have three luminescent centers. Two emission peaks at 365 nm and 380 nm correspond to the intrinsic self-trapped excitons emission and a defect-related trapped exciton emission, respectively. Cu doping introduces an intense Cu-bound exciton emission peaking at 540 nm with a large Stokes shift of 250 nm and a high photoluminescence quantum yield of 68%. With different excitation wavelengths and Cu-doping concentrations, Cs2HfCl6:Cu single crystals show tunable emissions. Under 254 nm ultraviolet light excitation, Cs2HfCl6:0.5%Cu yields cold white light with a high color rendering index (Ra = 87.3). These findings demonstrate the potential of Cs2HfCl6:Cu as a promising phosphor for cold WLEDs.
- Subjects
SINGLE crystals; LIGHT emitting diodes; COPPER; STOKES shift; ULTRAVIOLET radiation; HALIDES
- Publication
Physica Status Solidi - Rapid Research Letters, 2024, Vol 18, Issue 4, p1
- ISSN
1862-6254
- Publication type
Article
- DOI
10.1002/pssr.202300463