Xu Beibei, Bai Gongxun, Wang Juechen, Guo Qiangbing, Tan Dezhi, Chen Weibo, Liu Xiaofeng, Zhou Shifeng, Hao Jianhua, Qiu Jianrong
Opt Lett. 2014 May 15;39(10):3022-5. doi: 10.1364/OL.39.003022.
We report enhanced green and red upconversion (UC) luminescence in Ho3+-doped oxyfluoride germanate glass by introducing bismuth near-infrared active centers as sensitizers. The UC excitation bands at 750 and 970 nm show a full width at half-maximum of 20 and 45 nm, respectively. Energy transfer from sensitizers, the excited-state absorption, and phonon-coupled absorption of Ho3+ jointly contribute to the enhanced UC luminescence. Our approach provides an efficient methodology to broaden the excitation bandwidth of UC luminescent materials, which may have the potential for promising application in solar cells.
我们报道了通过引入铋近红外活性中心作为敏化剂，在掺Ho3+的氟氧化物锗酸盐玻璃中增强了绿色和红色上转换（UC）发光。750和970 nm处的UC激发带半高宽分别为20和45 nm。来自敏化剂的能量转移、Ho3+的激发态吸收和声子耦合吸收共同促成了增强的UC发光。我们的方法提供了一种拓宽UC发光材料激发带宽的有效方法，这可能在太阳能电池中有潜在的应用前景。
