共沉淀法制备Tm:YbSAG纳米粉体及其发光性能

Preparation of Tm:Yb SAG Nano-Powder by Coprecipitation Method and Its Optical Property

以聚乙二醇为分散剂,采用共沉淀法制备Tm:Yb3Sc Al4O12纳米粉体。最佳工艺条件为:煅烧温度1 000℃,煅烧时间2 h。通过对样品的扫描电子显微镜分析,得到纳米粉体平均粒径约为90 nm。测试了样品的激发和发射光谱,结果表明:在360 nm处激发峰最强,对应Tm3+的1D2→3H6能级跃迁;最强发射峰位于456 nm处,对应于1G4→3H6能级跃迁。测试了样品的上转换光谱,得到掺杂Tm3+的摩尔分数为2%时样品的发光强度较好,讨论了上转换发光机理,红光和绿光的发射是双光子吸收过程,蓝光发射源于1个三光子吸收过程。

Tm：YbSAG nano-powder was prepared by a coprecipitation results show that the nano-powder with the around average particle size method with polyethylene glycol as a dispersing agent. The of 90 nm can be obtained under the optimum conditions （i. e., calcination temperature of 1 000℃ and calcination time of 2 hours）. The features of excitation and emission spectra of Tm：YbSAG ceramics at room temperature were investigated. The most intense excitation and emission peaks are centered at 360 nm and 456 nm, which are corresponding to the 1D2→3H6 and 1G4--）.3H6 level transitions of Tm3＋. The better luminous intensity of the sample with 2% Tm3＋ doped was obtained. In addition, the light transition mechanism was also discussed.