Novel Cr3+-Doped Garnet Phosphor with Broadband Efficient Far-Red Emission for Photochrome Matching Plant-Lighting

作者：Dai, Xiangyi; Zou, Xikun; Zhang, Haoran; Chen, Weibin; Yang, Chaowei; Molokeev, Maxim S.; Xia, Zhiguo; Liu, Yingliang; Zhang, Xuejie; Zheng, Mingtao; Lei, Bingfu^*

来源：Advanced Optical Materials, 2023.

DOI：10.1002/adom.202302380

• Ca2YAl3-xGe2O12:xCr(3+)
• garnets
• plant growth LEDs
• pc-LEDs
• photoluminescence

Cr3+-doped phosphors are highly recognized in various fields for their remarkable luminous efficiency and spectral flexibility, including modern agriculture and horticulture. However, the shortage of suitable Cr3+-doped phosphors for far-red LED devices has inhibited their popularization in plant lighting. Herein, an innovative Cr3+-doped phosphor Ca2YAl3Ge2O12:Cr3+ (CYAG:Cr3+), achieving a broad far-red emission at 770 nm upon 450 nm blue light excitation is designed. The optimal CYAG:Cr3+ phosphor exhibits a high internal quantum yield of 78.2% and low thermal-quenching behavior of 85%@373 K. Thus, the fabricated phosphor-converted LEDs (pc-LEDs) for plant far-red lighting have a high output power of 33.3 mW and photovoltaic conversion efficiency of 11.5% at 100 mA. The potential of CYAG:Cr3+ in plant lighting is assessed by supplementing the far-red lighting of Italian lettuce with fabricated pc-LEDs, and the biomass of Italian lettuce is significantly increased by 33%. The successful development of CYAG:Cr3+ phosphors provides a high-quality option for plant far-red light devices and further stimulates the development of new Cr3+-doped plant-lighting phosphors.

• 单位
  华南农业大学