在980 nm LED激光器激发下, 研究了 Yb3+-Er3+共掺杂的Y2O3, Y2O2S和NaYS2粉末材料的上转换发射特性。比较了Y2O3∶0.20 Yb3+, 0.03Er3+和Y2O2S∶0.20 Yb3+, 0.03Er3+以及NaYS2:0.20 Yb3+, 0.03Er3+粉末样品的上转换发光光谱, 探讨了Er3+上转换发射对基质的依赖性,分析了S2--Yb3+和S2--Er3+电荷转移态对Yb3+-Er3+间能量传递和能级间跃迁几率的影响, 借助于能级图解释了在不同基质中Yb3+-Er3+间的能量传递和Er3+的上转换发光机制。

Y2O3∶0.20Yb3+, 0.03Er3+ and Y2O2S∶ 0.20Yb3+, 0.03Er3+ and NaYS2∶0.20Yb3+, 0.03Er3+powder samples were synthesized with solid-state and solution reacting methods, respectively. The upconversion (UC) emission properties under a continuous-wave semiconductor laser diode excitation at 980 nm were studied. The relationship between UC emission features and the hosts was explored. Effects of the S2--Yb3+ and S2--Er3+ charge transfer state (CTS) on the transfer-energy rate from Yb3+ to Er3+ and the transition rate between the Er3+ levels were analyzed in details. Furthermore, the energy-transfer processes between Yb3+ and Er3+ based on the energy matching conditions and the UC emission mechanism were discussed with schematic energy-level schemes.