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Journal of Alloys and Compounds

Journal of Alloys and Compounds

IF: 5.79
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Interstitial Oxygen Defect Inducing Near-Infrared Luminescence in Ca3La2W2O12 Phosphor

Published:12 December 2024 DOI: 10.1016/j.jallcom.2024.177970
Wenfei Qin, Peng Zhang, Xuan Miao, Yuzhu Yang, Sixia Li, Sai Zhou, Weisheng Liu

Abstract

Self-activated near-infrared (NIR) phosphors have recently gained extensive attention in special illumination and biomedical applications owing to its non-toxicity, inexpensiveness and especially undoped luminescence center ions. However, high photoluminescence quantum yields (PLQY) and thermal stability remain challenges for NIR-emitting phosphors. In this study, a self-activated phosphor Ca3La2W2O12 (CLWO) successfully achieved a NIR emission and high thermal stability. Under 350?nm excitation, the optimal CLWO:0.2%Bi3+ phosphor shows a narrowband emission in the range of 650-800?nm and a full width of half maximum (FWHM) of 36?nm. Mechanism studies demonstrate that the interstitial oxygen within CLWO host can work as the luminescence center, and enables self-activated emission in NIR waveband. Moreover, CLWO:0.2%Bi3+ phosphor shows a high PLQY of 48.84% and excellent thermal stability (I420 K/I300 K = 69.09%). A NIR phosphor-converted LED (pc-LED) based on a Ca3La2W2O12:Bi3+ (CLWO:Bi3+) phosphor is fabricated on a 350?nm LED chip, demonstrating its potential in NIR night-vision monitoring. This work certainly designs novel insights for outstanding thermal stability of self-activated phosphors and develops new research avenues for self-activated NIR LED light sources applications.

Substances (1)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Calcium carbonate 471-34-1 CCaO3 879 suppliers $10.00-$12730.00

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