An efficient far-red emission Sr2InSbO6:Mn4+, M (M = Li+, Na+, and K+) phosphors for plant cultivation LEDs

作者：Xie, Yan; Geng, Xue; Wang, Yuan; Guo, Jiang; Lu, Yuhui; Lv, Qiuyi; Ma, Zhijiang; Zhang, Dan; Zhao, Jin; Deng, Bin^*; Yu, Ruijin^*

来源：Journal of the American Ceramic Society, 2022, 105(2): 1300-1317.

DOI：10.1111/jace.18115

• luminescence
• phosphor
• plant cultivation LEDs
• Sr2InSbO6
• Mn4+

High-efficiency and far-red light phosphors based on Mn4+-doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn4+-doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn4+-activated oxide phosphors. Herein, a series of Sr2InSbO6:Mn4+, M (SISO:Mn4+, M) (M = Li+, Na+, and K+) far-red-emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of similar to 1.60 eV. The SISO:Mn4+ samples showed a far-red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far-red-phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole-dipole interaction by combining the Dexter theory and the Inokuti-Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li+, Na+, and K+) could improve the luminescent intensity of SISO:Mn4+. The optimum sintering temperature was 1300 degrees C. The internal quantum efficiencies of SISO:0.006Mn(4+) and SISO:0.006Mn(4+), 0.006Li(+) phosphors are 22.67% and 60.56%, respectively. SISO:Mn4+, Li+ phosphors-based plant growth light-emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs.

• 单位
  西北农林科技大学