Enhancement of luminescence, thermal stability and quantum efficiency with Ce3+ co-doped SrMg1·06Al9·94O17:Tb3+ phosphor

• DOI: 10.1016/j.heliyon.2023.e14492
• Publication Date: 2023-03-11T02:10:32Z
• Authors: Chenjing Shan; Qiyu Wang; Peng Xue; Lianhua Tian
• Keywords: Social sciences (General); H1-99; Q1-390; Science (General); Energy transfer; Thermal stability; 7. Clean energy; Phosphors

In this study, the photoluminescence properties of a series of SrMg1·06Al9·94O17 (SMAO):Ce3+, Tb3+, and SMAO:Tb3+ phosphors were investigated. At an excitation wavelength of 230 nm, the SMAO:Tb3+ phosphor emitted green light at 544 nm. When Ce3+ ions were co-doped into SMAO:Tb3+, the excitation band red-shifted from 230 to 269 nm, and the emission intensity was enhanced up to approximately 28 times compared with that of Ce3+-free SMAO:Tb3+ because of the efficient energy transfer from Ce3+ → Tb3+ in the SMAO host. Moreover, with the introduction of Ce3+, the thermal stability of the phosphors improved significantly. The luminescence intensity of the SMAO:3 mol%Tb3+ phosphor at 450 K was approximately 47% of that at room temperature. With the co-doping of Ce3+ ions, the emission intensity at 450 K was as high as 67%. The internal quantum efficiency (IQE) of SMAO:3 mol%Tb3+, 3 mol%Ce3+ increased to 55.14%. The SMAO:Tb3+,Ce3+ phosphors have potential applications in solid-state lighting.