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1. 中国科学院长春光学精密机械与物理研究所, 激发态物理重点实验室,吉林 长春,130033
2. 宁波大学, 光电材料研究所,浙江 宁波,315211
收稿日期:2002-09-11,
修回日期:2002-11-06,
纸质出版日期:2003-01-20
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王绩伟, 宋宏伟, 夏海平, 孔祥贵, 许武, 张家骅. Eu<sup>3+</sup>掺杂铌酸盐玻璃的光谱性质[J]. 发光学报, 2003,24(1): 81-86
WANG Ji-wei, SONG Hong-wei, XIA Hai-ping, KONG Xiang-gui, XU Wu, ZHANG Jia-hua. Fluorescence Properties of Trivalent Europium Doped in Various Niobate Codoped Glasses[J]. Chinese Journal of Luminescence, 2003,24(1): 81-86
王绩伟, 宋宏伟, 夏海平, 孔祥贵, 许武, 张家骅. Eu<sup>3+</sup>掺杂铌酸盐玻璃的光谱性质[J]. 发光学报, 2003,24(1): 81-86 DOI:
WANG Ji-wei, SONG Hong-wei, XIA Hai-ping, KONG Xiang-gui, XU Wu, ZHANG Jia-hua. Fluorescence Properties of Trivalent Europium Doped in Various Niobate Codoped Glasses[J]. Chinese Journal of Luminescence, 2003,24(1): 81-86 DOI:
研究了Eu
3+
掺杂铌磷与铌硅系列玻璃的发射光谱
声子边带谱及5D0能级寿命
计算了样品的强度参数.随着Nb
2
O
5
浓度的增加
Eu-O键强增大
共价性增强
Eu
3+
的局域环境对称性降低
电声子耦合增强
5D0能级的无辐射过程加快
寿命变短
温度猝灭加剧.研究了从77~690K铌磷与铌硅系列玻璃中Eu
3+
离子在488nm激光激发下的变温荧光发射特性
求出了温度猝灭速率.分析了发光强度增强与减弱的原因
即热布居与无辐射过程随温度的变化关系
研究了谱线宽度与峰值位置随温度的变化关系.
Series of niobate-phosphate and niobate-silicate glasses doped with Eu
3+
ions were prepared. The emission
phonon-side band spectra and fluorescence lifetimes of these glasses were studied and the intensity parameters Ω
2
of Eu
3+
were obtained. The temperature-dependence of emission intensity of the Eu
3+
-ion in these niobate glasses was investigated. The temperature-quenching rates were determined. The results indicate that in niobate glasses
as the concentration of Nb
2
O
5
increases
the covalence becomes strong
the symmetry becomes low and the electron-phonon coupling strength becomes strong
thus the lifetimes become short
the nonradiative transition processes and the temperature-quenching become strong. The temperature-dependent behavior of the Eu
3+
ion was studied in various niobate glasses. The variation of the emission intensity of Eu
3+
with temperature was attributed to two factors
the thermally excited emission from
7
F
2
to
5
D
2
and the temperature-quenching effect. The former tends to cause the intensity of Eu
3+
increase with temperature
while the later tends to cause the intensity decrease. The temperature-quenching rates in various glasses were obtained. They increase with the increasing concentration of Nb
2
O
5
. The temperature-dependencies of the peak energies and the line widths of
5
D
0
→
7
F
J
(
J
=0
1)were experimentally determined.
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