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首页> 外文期刊>Optical Materials >Resonant excited UV luminescence of the Gd~(3+) centres in borate glasses, co- doped with Gd and Ag
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Resonant excited UV luminescence of the Gd~(3+) centres in borate glasses, co- doped with Gd and Ag

机译：掺有Gd和Ag的硼酸盐玻璃中Gd〜（3+）中心的共振激发紫外发光

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摘要

The Li2B4O7:Gd, CaB4O7:Gd, LiCaBO3:Gd, and Li2B4O7:Gd, Ag glasses of high optical quality, obtained by standard technology, have been investigated by electron paramagnetic resonance (EPR) and optical spectroscopy at room temperature. The Gd impurity was added in the raw materials as Gd2O3 oxide in amounts 0.5 and 1.0 mol.%. The Ag impurity was introduced into the Li2B4O7 composition as AgNO3 and as highly dispersed metallic Ag in amount 2.0 mol.%. In all Gd-doped glasses was observed typical for glasses EPR U-spectrum of the Gd3+ (S-8(7/2), 4f(7)) ions. In the Gd-doped glasses upon the 273 rim excitation was observed weak UV emission line at 311 nm that is attributed to the P-6(7/2)-> S-8(7/2) intraconfiguration 4f - 4f transition of the Gd3+ ions. In the Li2B4O7:Gd, Ag glass has been observed significant (similar to 100 times) increasing of peak intensity of the Gd3+ emission line at 311 nm in comparison with this line in CaB4O7:Gd glass. In luminescence excitation spectra of the CaB4O7:Gd and Li2B4O7:Gd, Ag glasses are observed characteristic groups of lines corresponding to the S-8(7/2) -> I-6(J), D-6(J) transitions of the Gd3+ ions. Significant increasing of the Gd3+ emission line at 311 nm in the Li2B4O7:Gd, Ag glass is explained by energy transfer from Ag+ (4d(10)) to Gd3+ (4f(7)) upon 273 rim excitation that is resonant for 4d(10)-> 4d(9) 5s(1) (S-1(0) -> D-1(2)) and S-8(7/2) -> I-6(J) transitions of the Ag+ and Gd3+ ions. Luminescence kinetics of the Gd3+ and Ag+ centres was investigated and analysed. Obtained results show that the borate glasses, co-activated by Gd3+ and Ag+, can be promising materials for effective UVB light sources for biomedical applications.
机译：通过标准技术获得的高光学质量的Li2B4O7：Gd，CaB4O7：Gd，LiCaBO3：Gd和Li2B4O7：Gd Ag玻璃在室温下通过电子顺磁共振（EPR）和光谱进行了研究。将Gd杂质作为Gd 2 O 3氧化物以0.5和1.0摩尔％的量添加到原料中。将Ag杂质作为AgNO 3和作为高度分散的金属Ag以2.0摩尔％的量引入Li 2 B 4 O 7组合物中。在所有掺Gd的玻璃中，通常观察到Gd3 +（S-8（7/2），4f（7））离子的玻璃EPR U谱。在273边缘激发时，在掺Gd的玻璃中观察到311 nm处弱的紫外线发射线，这归因于P-6（7/2）-> S-8（7/2）的内部构型4f-4f跃迁。 Gd3 +离子。在Li2B4O7：Gd中，已观察到与CaB4O7：Gd玻璃中的Ag玻璃相比，Ag玻璃在311 nm处的Gd3 +发射谱线的峰值强度显着（接近100倍）增加。在CaB4O7：Gd和Li2B4O7：Gd的发光激发光谱中，观察到Ag玻璃对应于S-8（7/2）→I-6（J），D-6（J）跃迁的线的特征组。 Gd3 +离子。 Li2B4O7：Gd中的311 nm处的Gd3 +发射线的显着增加是由273个边缘激发共振后从Ag +（4d（10））到Gd3 +（4f（7））的能量转移引起的，该能量共振了4d（10 ）-> 4d（9）5s（1）（S-1（0）-> D-1（2））和S-8（7/2）-> I-6（J）Ag +和Gd3 +的转变离子。研究和分析了Gd3 +和Ag +中心的发光动力学。所得结果表明，由Gd3 +和Ag +共激活的硼酸盐玻璃可以成为有希望的材料，用于生物医学应用的有效UVB光源。

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