WANG Sanhai ¹, WANG Lianjun ^{1, 2}, JIANG Wan ^{1, 2}, JIANG Weihui ¹, CHEN Ting ^{1, 3}, ZHANG Xiaojun ¹, WANG Wenqiang ¹, XIAO Zhuohao ¹, KONG Lingbing ⁴

(1. Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China; 2. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China; 3. College of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China; 4. College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, Guangdong, China)

Abstract: The weak absorption of Eu³⁺ activated red phosphors has limited their application. Although broadband excitation has been achieved in BaBi₂(MoO₄)₄:Eu³⁺ phosphors, the structure and luminescence mechanism have not been well studied and the absorption intensity needs to be further optimized. In this study, BaBi₂(MoO₄)₄:Eu³⁺ red phosphors were prepared by using the solid-state reaction method. The effects of doping with Sr²⁺ and Y³⁺, structural variation and the distribution of Bi³⁺ ions on the luminescence properties of  BaBi₂(MoO₄)₄:Eu³⁺ were systematically studied. When the calcination temperature is 750 ℃, the luminescence is the strongest under the excitations of near-ultraviolet light with different wavelengths. The addition of Sr²⁺ led to structural changes, whereas the doping of Y³⁺ altered the distribution of Bi³⁺ ions and further enhanced the PLE intensity. However, excessive Y³⁺ resulted in reduction in PLE intensity. Our study can be used as a reference for understanding the mechanism of Bi³⁺ ions in Eu³⁺ activated red phosphors.

Key words: red phosphor; Eu³⁺ ion; broadband excitation; luminescence mechanism; white LEDs