Optical transition and upconversion luminescence in Er3+ doped and Er3+-Yb3+ co-doped fluorophosphate glasses
Optical transition and upconversion luminescence in Er3+ doped and Er3+-Yb3+ co-doped fluorophosphate glasses
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DOI：
10.1016/j.optmat.2010.03.023
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发表时间：
2010-07-01
影响因子：
3.9
通讯作者：
Su, Qiang
中科院分区：
文献类型：
--
作者：
Lai, Boyuan;Feng, Li;Su, Qiang
制备了掺Er~（3+）和Er~（3+）-Yb~（3+）的YF_3-BaF_2-Ba（PO_3）_2氟磷酸盐玻璃，并对其结构进行了初步研究。根据Judd-Ofelt理论计算了实验强度参数，得到了Er3+的辐射跃迁几率、荧光分支比和辐射寿命。在980 nm半导体激光器激发下，观察到Er3 +-Yb3+共掺样品的明亮的绿色和红色上转换发光，并通过研究发光强度与激发功率的关系，确定了发光的双光子吸收过程。Er 3+浓度对上转换发光强度和衰减时间的影响表明，Er 3+浓度的增加降低了Yb 3+向Er 3+连续能量转移的几率，从而增加了红光与绿色光的强度比。温度对不同发射带的强度比的影响表明，基于荧光强度比（FIR）的最大换能器灵敏度在6 ° C时计算为0.0015/° C。
Fluorophosphates glasses YF3–BaF2–Ba(PO3)2doped with Er3+and Er3+–Yb3+were prepared and the structures of the samples were briefly investigated. The experimental intensity parameters were calculated according to the Judd–Ofelt theory, from which the radiative transition probabilities, fluorescence branching ratios, and radiative lifetimes of Er3+were obtained. Bright green and red upconversion emissions was observed in Er3+–Yb3+co-doped samples excited by 980nm laser diode, and two-photons absorption processes were determined for the emissions by examining the dependence of the emission intensity on the excitation power. The concentration effects on the intensity and decay time of the upconversion emission revealed that growing Er3+concentration declined the probability of sequential energy transfer from Yb3+to Er3+, and thus increasing the intensity ratio of the red emission to the green ones. The temperature effects on the intensity ratios of different emission bands showed that the maximum transducer sensitivity based on the fluorescence intensity ratio (FIR) was calculated to be 0.0015/°C at 6°C.