Green and red up-conversion emissions and thermometric application of Er^(3+) -doped silicate glass

The green and red up-conversion emissions centred at about 534, 549 and 663 nm of wavelength, corresponding respectively to the ^2H11/2 → ^4I15/2, ^4S3/2 → ^4I15/2 and ^4F9/2 → ^4I15/2 transitions of Er^3＋ ions, have been observed for the Er^3＋-doped silicate glass excited by a 978 nm semiconductor laser beam. Excitation power dependent behaviour of the up-conversion emission intensity indicates that a two-photon absorption up-conversion process is responsible for the green and red up-conversion emissions. The temperature dependence of the green up-conversion emissions is also studied in a temperature range of 296-673 K, which shows that Er^3＋-doped silicate glass can be used as a sensor in high-temperature measurement.

Influence of CeO_2 on scintillating properties of Tb^(3+)-doped silicate glasses

A series of Tb3+-,Ce3+-doped,and Tb3+/Ce3+-codoped silicate glasses were synthesized by melt-quenching technique.Some properties of the investigated glasses were characterized by X-ray photoelectron spectroscopy(XPS),photoluminescence(PL),X-ray excited luminescence(XEL) and thermoluminescence(TL) spectra.The result of XPS revealed that both Ce3+ and Ce4+ ions coexisted in these silicate glasses,and energy transfer from Ce3+ to Tb3+ ions was observed under UV excitation.However,under X-ray excitation the XEL...

Tb^(3+)、Gd^(3+)对硅酸盐发光玻璃发光性能的影响

对Nb3 + 激活的硅酸盐发光玻璃进行了研究 ,讨论了Tb3+ 和Gd3 + 对玻璃发光性能的影响。结果表明 :Tb3+ 激活的硅酸盐玻璃在紫外线和X 射线的激发下 ,产生蓝色荧光和较强的绿色荧光 ;随着Tb3+ 离子浓度的增加 ,Tb3 + 离子5D3 能级的能量向5D4 能级转移 ,绿色荧光得到增强 ;Gd3 + 离子通过无辐射能量共振方式对Tb3+ 离子的发光起到了敏化作用 ,加入Gd3+ 进一步提高了Tb3+

Tb^3＋掺杂硅酸盐玻璃发光性能的浓度依赖关系

利用高温熔融法制备了不同浓度的Tb3+掺杂硅酸盐玻璃,并分别测量了紫外和X射线激发时的发射光谱。光谱结果表明,不同浓度Tb3+掺杂硅酸盐玻璃在紫外和X射线激发时发光行为具有相似的浓度依赖关系:低浓度Tb4O7掺杂时主要以蓝光(5D3→7FJ)发射为主,而高浓度掺杂时以绿光(5D4→7FJ)发射为主。Tb3+发光强度与掺杂浓度的关系分析表明,5D3的浓度猝灭是电偶极-电偶极相互作用引起的,而5D4的浓度猝灭是交换相互作用引起的。

Tb^(3+)激活硅酸盐发光玻璃的研究进展

简要介绍了研究发光玻璃的必要性 ,发光玻璃的要求及分类 ,综合评述了Tb3+激活硅酸盐发光玻璃的研究现状 。