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

Author:

Dai Xiangyi1,Zou Xikun1,Zhang Haoran12,Chen Weibin1,Yang Chaowei1,Molokeev Maxim S.3,Xia Zhiguo4,Liu Yingliang1,Zhang Xuejie12,Zheng Mingtao12,Lei Bingfu12ORCID

Affiliation:

1. Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and Energy South China Agricultural University Guangzhou Guangdong 510642 P. R. China

2. Maoming Branch Guangdong Laboratory for Lingnan Modern Agriculture Maoming Guangdong 25100 P. R. China

3. SB RAS Kirensky Inst Phys Lab Crystal Phys Krasnoyarsk 660036 Russia

4. The State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques School of Physics and Optoelectronics South China University of Technology Guangzhou 510641 P. R. China

Abstract

AbstractCr3+‐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.

Funder

Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams

National Natural Science Foundation of China

Publisher

Wiley

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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