高温固相法制备了Yb3+/Tm3+共掺的Sb2O4发光粉体, 研究了其上转换发光性质。 在980 nm半导体激光器的激发下, 样品发射较强的近红外(800 nm)和较弱的蓝色(480 nm)及红色(680 nm)上转换发光。 粉末样品中稀土Yb3+及Tm3+浓度对上转换发光性质具有显著的影响, 随着Yb3+或Tm3+浓度的增加, 上转换发光增强; Tm3+掺杂浓度达08%时其上转换发光强度达到最大, 之后上转换发光随Tm3+浓度的增加而减弱, 这是由于浓度猝灭引起的。 探讨了粉末样品的上转换发光机理, 在980 nm激发下Tm3+的蓝光和近红外上转换发光均属于二光子的上转换发光过程。

The Sb2O4∶Yb3+, Tm3+ up-conversion luminescence powder with excellent physical, chemical stability and relative low phonon energy was synthesized by the high temperature solid-state reaction and its up-conversion luminescence property was investigated. Under the 980 nm excitation, infrared and blue up-conversion emissions centered at 800 and 480 nm were observed, which were assigned to the 1G4→3H6 and 3H4→3H6 transitions of Tm3+, respectively. The influence of Yb3+ and Tm3+ concentration on the up-conversion emission property was also obtained. The up-conversion luminescence increases with increasing of Yb3+ and Tm3+ concentration. Additionally, the up-conversion luminescence mechanism was discussed based on the dependence of Tm3+ up-conversion luminescence on pump power. It is interesting that two photon excitation processes for blue and infrared emission were observed in the Sb2O4∶Yb3+, Tm3+ powder under a 980 nm excitation. Based on the energy level diagram of Tm3+ and Yb3+ ions, we think that two photons blue emission is contributed to the cooperation energy transfer between Tm3+ and Yb3+ ions. We believe that the Sb2O4∶Yb3+, Tm3+ up-conversion luminescence powder will have potential application for new optical devices in up-conversion color displays, sensors, detection of infrared radiation, and lasers.