Sensitization mechanisms of 1 µm luminescence in Tb3+–Yb3+ co‐doped borate glasses
Sensitization mechanisms of 1 µm luminescence in Tb3+–Yb3+ co‐doped borate glasses
复制标题
DOI：
10.1002/pssa.201084072
复制
发表时间：
2011-08
期刊：
影响因子：
--
通讯作者：
J. Ueda;S. Tanabe
中科院分区：
文献类型：
--
作者：
J. Ueda;S. Tanabe
制备了Tb 3 +-Yb 3+共掺硼酸盐玻璃，并通过光致发光（PL）、PL激发（PLE）光谱和寿命测量研究了Yb 3+的红外发光的紫外/可见敏化作用。Tb3+：在378和488 nm激发下，观察到5D4- 7 FJ的可见光发光和Yb 3+：2F 5/2- 2F 7/2的1000 nm发光。基于Yb 3+：2F 7/2能级的积分PL强度和寿命的Yb 3+浓度依赖性的行为的差异，通过UV和蓝色激发的能量转移（ET）路径是不同的。在监测Yb ~（3+）发光的PLE谱中观察到Tb ~（3+）-Yb ~（3+）对之间的价间电荷转移（IVCT）带。结果表明，在488 nm波长下Tb ~（3+）的5D4能级激发下的电子转移是由声子辅助的电子转移或合作下转换引起的。
Tb3+–Yb3+ co‐doped borate glasses were prepared and the ultraviolet/visible sensitization of infrared luminescence of Yb3+ has been evaluated by the photoluminescence (PL), the PL excitation (PLE) spectra, and the lifetime measurement. The Tb3+: 5D4–7FJ luminescence in visible range and the Yb3+: 2F5/2–2F7/2 luminescence at 1000 nm were observed upon the excitation of Tb3+: 4f levels by 378 and 488 nm. On the basis of the difference in behavior of the Yb3+ concentration dependence of the integrated PL intensity and lifetimes of the Yb3+:2F7/2 level by UV and blue excitations, the energy transfer (ET) paths by the UV, and blue excitation are different. The intervalence charge transfer (IVCT) band between the Tb3+–Yb3+ pair were observed in the PLE spectra monitoring the Yb3+ emission. We conclude that the ET is caused through the IVCT state by the UV excitation and the ET upon the 5D4 level excitation of Tb3+ by 488 nm is caused by phonon assisted ET or cooperative downconversion.