Enhancement of luminescence, thermal stability and quantum efficiency with Ce3+ co-doped SrMg1·06Al9·94O17:Tb3+ phosphor
Chenjing Shan, Qiyu Wang, Peng Xue, Lianhua Tian
Abstract
In this study, the photoluminescence properties of a series of SrMg 1·06 Al 9·94 O 17 (SMAO):Ce 3+ , Tb 3+ , and SMAO:Tb 3+ phosphors were investigated. At an excitation wavelength of 230 nm, the SMAO:Tb 3+ phosphor emitted green light at 544 nm. When Ce 3+ ions were co-doped into SMAO:Tb 3+ , 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 Ce 3+ -free SMAO:Tb 3+ because of the efficient energy transfer from Ce 3+ → Tb 3+ in the SMAO host. Moreover, with the introduction of Ce 3+ , the thermal stability of the phosphors improved significantly. The luminescence intensity of the SMAO:3 mol%Tb 3+ phosphor at 450 K was approximately 47% of that at room temperature. With the co-doping of Ce 3+ ions, the emission intensity at 450 K was as high as 67%. The internal quantum efficiency (IQE) of SMAO:3 mol%Tb 3+ , 3 mol%Ce 3+ increased to 55.14%. The SMAO:Tb 3+ ,Ce 3+ phosphors have potential applications in solid-state lighting.