Near-Unity and Zero-Thermal-Quenching Far-Red-Emitting Composite Ceramics via Pressureless Glass Crystallization,Laser & Photonics Reviews

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Near-Unity and Zero-Thermal-Quenching Far-Red-Emitting Composite Ceramics via Pressureless Glass Crystallization
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-06-04 , DOI: 10.1002/lpor.202100060
Guojun Zheng ₁ , Wenge Xiao ₁ , Huajun Wu ₂ , Jianhong Wu ₁ , Xiaofeng Liu ₃ , Jianrong Qiu _{1,

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Affiliation

Laser-driven (LD) lighting is emerging as the next-generation high-power solid-state lighting technology. All-inorganic color converters with high quantum efficiency (QE), small thermal quenching, high thermal conductivity, and high thermal and chemical stabilities are crucial to coping with the enormous heat generated in LD lighting. Although luminescent translucent ceramics are the most promising class of color converters, only green/yellow-emitting ones with satisfactory performance are developed before. Here, a far-red-emitting composite ceramics Y₃Al₅O₁₂ (YAG)–Al₂O₃:Cr³⁺ with near-unity internal QE and zero-thermal quenching are prepared via pressureless glass crystallization, where the inside light scattering is finely tuned by simply manipulating the temperature to induce controllable grain growth. The commonly used inert matrix Al₂O₃ here becomes an optically active component as YAG, thus alleviating the undesired concentration quenching while maintaining strong light absorption. Therefore, a high-power LD far-red lighting source with luminescence saturation threshold up to 21.4 W mm⁻² is demonstrated, which may find broad applications in plant growth lighting, solar simulators, and phototherapy.

中文翻译：

通过无压玻璃结晶的近统一和零热淬火远红光复合陶瓷

激光驱动 (LD) 照明正在成为下一代高功率固态照明技术。具有高量子效率 (QE)、小热猝灭、高导热率以及高热和化学稳定性的全无机颜色转换器对于应对 LD 照明产生的巨大热量至关重要。虽然发光半透明陶瓷是最有前途的一类颜色转换器，但以前只开发了性能令人满意的绿/黄发光陶瓷。这里，发射远红光的复合陶瓷 Y ₃ Al ₅ O ₁₂ (YAG)–Al ₂ O ₃ :Cr ³⁺通过无压玻璃结晶制备具有接近统一的内部 QE 和零热淬火的材料，其中通过简单地操纵温度来微调内部光散射以诱导可控的晶粒生长。此处常用的惰性基质 Al ₂ O ₃变成了作为 YAG 的光学活性组分，从而在保持强光吸收的同时减轻了不希望的浓度猝灭。因此，展示了一种发光饱和阈值高达21.4 W mm ^-2的大功率LD远红光光源，可广泛应用于植物生长照明、太阳模拟器和光疗。

更新日期：2021-07-08

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