荧光粉
发光二极管
材料科学
光电子学
镥
发射强度
量子效率
吸收(声学)
二极管
半最大全宽
兴奋剂
钇
冶金
氧化物
复合材料
作者
Heng Liang,Shihao Wu,Yan Li,Jiaxing Zuo,Biqing Song,Peng Jie,Xinyu Ye
标识
DOI:10.1016/j.jallcom.2022.168374
摘要
Near-infrared phosphor-converted light emitting diodes (NIR pc-LEDs) is developing rapidly in plant cultivation because of its low cost, compact size and high efficiency. The NIR light of 700 ∼ 760 nm is known to be beneficial for seed germination and growth. Therefore, the exploration of NIR phosphors with specific wavelength and high efficiency is essential for the development of high-performance plant cultivation pc-LEDs. In this study, a highly efficient and thermal stable Cr3+ doped Lu2CaAl4SiO12 (LCAS) phosphor with broadband NIR emission covering phytochrome Pfr absorption range was successfully realized via Ca2+-Si4+ co-substitution of Lu3+-Al3+ pairs. The LCAS:0.07 Cr3+ exhibits a major emission peak of 740 nm with a FWHM of 160 nm and its internal/external quantum yield (IQY/EQY) is as high as 80%/30.5%. The integrated emission intensity of LCAS:0.07Cr3+ at 423 K lost only 33.8% of its initial intensity, indicating that it has a good thermal stability. When the LCAS:0.07Cr3+ was packaged into a pc-LED with a driving current of 320 mA, the device output power and photoelectric efficiency reached 90.6 mW and 8.6%, respectively, demonstrating that this phosphor has potential application in plant cultivation lighting.
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