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Updated: Jul 10, 2026
Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
Published on: November 15, 2016
Cuprous-Hybrid Metal Halides with Multimode Self-Trapped Excitons Enable Full-Spectrum White-Light Emission with
Bing Wang1, Yuxin Zhan1, Shen Yan2
1College of Optical and Electronic Technology, China Jiliang University, Hangzhou, Zhejiang 310018, China.
Abstract:
Zero-dimensional (0D) cuprous-based metal halides have recently gained prominence as advanced luminescent materials owing to their structural tunability and distinctive broadband self-trapped exciton (STE) emission. Herein, a 0D structure, ETPA2Cu2Br2I2 (ETPA+ = ethyltripropylammonium) crystal, was synthesized via a solution growth method. The rigid dimer [Cu2Br2I2]2-, formed due to the mixed-halide effect, effectively suppresses nonradiative recombination at room temperature. Temperature-dependent photoluminescence and Raman spectroscopic analyses systematically reveal dual STE emission channels originating from multimode vibronic coupling, achieving full-visible-spectrum white light emission with Commission Internationale de l'Éclairage (CIE) coordinates (0.3337, 0.3449) and a near-unity photoluminescence quantum yield of 95.94%. A prototype white LED fabricated with a 295 nm UV chip exhibits a high color rendering index (CRI = 88.4) and warm-white emission, demonstrating its potential for next-generation solid-state lighting and visible light communication systems.
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01:14Photoluminescence: Applications
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.