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1.
Pr3+掺杂的LaF3纳米微晶/氟氧化物玻璃陶瓷的激光选择激发 总被引:4,自引:3,他引:4
研究了Pr^3 掺杂纳米晶/氟氧化物玻璃陶瓷的光谱性质,选择激发光谱分辨了氟氧化物玻璃陶瓷和其中的LaF3纳米微晶内的Pr^3 离了,可以看到LaF3纳米微晶/氟氧化物玻璃陶瓷体系在光谱上未表现出明显的界面效应,这对良好的发光性质可能是一种有利因素,纳光微粒小的尺寸和大表面增加了掺杂离子的局域环境的离散性,使纳米微粒中谱线的非均匀线宽比体材料中大,且随粒径减小而增加,掺杂离子在微晶中富集,或在界面附近富集,提高了微晶中或微晶内局部范围中的浓度,增加了交叉迟豫的几率,出现浓度猝灭,因此Pr^3 离子在LaF3中的富集而引起的浓度猝灭是发光能级寿命缩短的主要原因。 相似文献
2.
在组成为15Li2O-15Nb2O5-70TeO2-0.1Er2O3-0.4Yb2O3(%, 摩尔分数)的碲酸盐玻璃基础上, 采用两步热处理法制备了透明的含纳米晶颗粒碲酸盐玻璃陶瓷. 通过X射线衍射(XRD)测试表明, 玻璃陶瓷中的晶体颗粒组成为Yb6Te5O19.2或Er6Te5O19.2, 晶粒尺寸约为55 nm. 根据Judd-Ofelt理论计算了Er^3+离子在基质玻璃和玻璃陶瓷中的光谱参数Ωt(t=2, 4, 6)以及Er^3+:4I15/2→4I13/2跃迁自发辐射几率, 根据McCumber理论计算了Er^3+:4I13/2→4I15/2跃迁的发射截面. 测试了基质玻璃和玻璃陶瓷的拉曼光谱, 对比研究了铒离子在基质玻璃和玻璃陶瓷中1.5 μm处荧光和上转换光谱特性. 相似文献
3.
Pr3+掺杂的LaF3纳米微晶/氟氧化物玻璃陶瓷的VUV光谱 总被引:1,自引:0,他引:1
The vacuum ultraviolet (VUV) spectroscopic properties of praseodymium (Pr3+, 1at%) doped LaF3 nanocrystals/glass at room temperature and 20 K are reported. Two types of Pr3+ ions, those in LaF3 nanocrystals and those in the glass host, were excited to 4f 5d band by VUV using synchrotron radiation as an excitation source, and emissions of 1S0 → 1D2 (336 nm), 1S0 → 1I6 (397 nm ) of Pr3+ in the nanocrystals and emissions of 4f 5d → 3HJ, 3FJ of Pr3+ in the glass appeared at the same time. But unlike in the bulk sample crystals, emission of 3P0 → 3HJ, 3FJ as the second step of the quantum splitting (QS) of Pr3+ in the LaF3 nanocrystals was not observed at room temperature, which could be explained that Pr3+ ions in the glass absorbed the energy of 3P0→ 3H4 of Pr3+ in the nanocrystals. Two types of excitation spectra monitoring different emissions were also measured, so it could be observed that the lowest energy of 4f 5d band of Pr3+ in the nanocrystals was about 53 500 cm-1 (186 nm) and in the glass about 33 800 cm-1(295 nm), respectively. These emission and excitation spectra were contrasted to those of bulk sample crystals LaF3∶Pr3+. 相似文献
4.
本文系统制备了980nm半导体崩浦的应用于1.54μm波段微片激光器的高Er^3 /Yb^3 共掺杂的氟铝酸盐玻璃。通过玻璃的吸收光谱,发射光谱和上转换荧光光谱的测试,对其光学性质、浓度淬灭及其淬灭机制进行了分析和讨论。当玻璃中Er^3 离子掺杂浓度低于10mol%的情况下,浓度淬灭现象较弱,Er^3 /Yb^3 共掺杂的氟铝酸盐玻璃在由于Er^3 离子^4 I13/2→4^I 15/2跃迁所引起的1.54μm波段的发射强度比Er^3 单掺杂的氟铝酸盐玻璃中的荧光强度要强。在Er^3 离子掺杂浓度高于10mol%的情况下,由于Er^3 与Yb^3 之间的反能量转移过程,Er^3 /Yb^3 共掺杂的氟铝酸盐玻璃的1.54μm波段的荧光浓度淬灭效应比Er^3 离子单掺杂的情况下明显。在Er^3 离子掺杂浓度小于10mol%的情况下,实验中发现可获得1.54μm波段高发射效率的Er^3 与Yb^3 离子最佳摩尔浓度掺杂比例约为1:1。 相似文献