论文部分内容阅读
以柠檬酸为燃烧剂,采用柠檬酸燃烧法制备Er,Yb:YSAG纳米粉体。通过对不同煅烧温度下样品的X射线衍射和扫描电子显微镜分析,确定最佳煅烧温度为900℃。测试了室温条件下样品的激发和发射光谱。结果表明:在381 nm处激发峰最强,对应Er~(3+)的~4I_(15/2)→~2H_(9/2)能级跃迁;最强发射峰在1 547 nm处,对应Er~(3+)的~4I_(13/2)→~4I_(15/2)能级跃迁。测试了样品的上转换荧光光谱,研究了Er~(3+)和Yb~(3+)掺杂量对样品发光强度的影响,得到了Er~(3+)和Yb~(3+)的最佳掺杂量分别为3%和9%,讨论了绿光、红光的发光跃迁机制,验证样品发光为双光子过程。
Using citric acid as fuel, Er, Yb: YSAG nanopowders were prepared by citric acid combustion method. Through the X - ray diffraction and scanning electron microscopy analysis of the samples at different calcination temperatures, the optimal calcination temperature was 900 ℃. The excitation and emission spectra of the samples were tested at room temperature. The results show that the strongest excitation peak at 381 nm corresponds to ~ 4I_ (15/2) → ~ 2H_ (9/2) transitions at Er ~ (3+). The strongest emission peak at 1 547 nm corresponds to ~ 4I_ (13/2) → ~ 4I_ (15/2) transitions of Er ~ (3+). The up-conversion fluorescence spectra of the samples were tested. The effects of Er 3+ and Yb 3+ doping on the luminescence intensity of the samples were investigated. The results showed that Er 3+ and Yb 3+ The optimal doping amount is 3% and 9% respectively. The mechanism of the luminescence transition of green and red light is discussed. The two-photon process is verified.