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Strategies to approach high performance in Cr³+-doped phosphors for high-power NIR-LED light sources

Engineering and Technology

Strategies to approach high performance in Cr³+-doped phosphors for high-power NIR-LED light sources

Z. Jia, C. Yuan, et al.

Discover how a remarkable new method enhances the efficiency of near-infrared-emitting phosphors for next-generation NIR light sources. This exciting research led by Zhenwei Jia and colleagues reveals a way to achieve a staggering internal quantum efficiency of 92.3% and outstanding thermal stability, paving the way for powerful NIR-LED devices.

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Playback language: English
Abstract
Broadband near-infrared (NIR)-emitting phosphors are key for next-generation smart NIR light sources based on blue LEDs. To achieve excellent NIR phosphors, a strategy of enhancing crystallinity, modifying micromorphology, and maintaining the valence state of Cr³⁺ in Ca₃Sc₂Si₃O₁₂ garnet (CSSG) is proposed. By adding fluxes and sintering in a reducing atmosphere, the internal quantum efficiency (IQE) is greatly enhanced to 92.3%. The optimized CSSG:6%Cr³⁺ exhibits excellent thermal stability (maintaining 97.4% of room temperature NIR emission at 150 °C). The fabricated NIR-LED device emits a high optical power of 109.9 mW at 520 mA. The mechanism for optimization is investigated, and an application of the NIR-LED light source is demonstrated.
Publisher
Light: Science & Applications
Published On
Jan 31, 2020
Authors
Zhenwei Jia, Chenxu Yuan, Yongfu Liu, Xiao-Jun Wang, Peng Sun, Lei Wang, Haochuan Jiang, Jun Jiang
Tags
near-infrared
phosphors
quantum efficiency
thermal stability
garnet
Ca₃Sc₂Si₃O₁₂
NIR-LED

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