玻璃基质与纳米颗粒相互影响的光谱学研究

通过低温选择激发玻璃陶瓷中的LaF3:Tm3+的1D2能级,成功地分开了两种局域环境中Tm3+离子的发射谱,使一些频率的发射谱仅来自于晶相,而另一些则仪来自于玻璃相.讨论了玻璃陶瓷中形成玻璃的氧化物和以晶相析出的氟化物之间的相互作用对两种局域环境中Tm3+离子的光学性能的影响.结果表明:晶粒较大时,氧化物玻璃对处于纳米晶体局域环境的稀土离子的影响减弱,纳米晶体对处于氧化物玻璃局域环境的稀土离子的影响增强;晶粒较小时,氧化物玻璃和晶粒接触面的增加会降低处于纳米晶体局域环境的稀土离子的发光效率,但纳米晶体对处于氧化物玻璃局域环境的稀土离子的影响减弱.晶粒越大,氧化物玻璃对处于纳米品体局域环境的稀土离子的发光影响越小,发光性能越好.玻璃基质中SiO2的含量能影响两种局域环境的Tm3+离子发光效率.

Spectroscopic Study on the Interaction of Glass Matrixes and Nanoparticles in Tm3+Doped Oxyfluoride Glass Ceramics

Fluorescence emission spectra from Tm^3+ in crystal phase and glass phase were separated under selective excitation of ^1D2 level in Tm^3+ doped transparent oxyfluoride glass ceramics containing LaF3 nanocrystals. Emissions from the crystal phase and from the glass phase were detected. The influence of the interaction between glass matrix and nanoerystals on the optical characteristics of Tm^3+ ions in the two different local environments was investigated. The results indicate that the increase in nanocrystal size results in a decrease in the impact of oxides glass on Tm^3+ in the crystal phase, and an enhancement of the impact of nanocrystals on Tm^3+ in the glass phase. For smaller nanoparticles, the emission efficiency of Tm^3+ ions in the crystal phase was reduced, and the influence of nanocrystals on the ions in the glass phase was reduced too. The larger the nanocrystal size, the weaker the influence of oxide glass on the Tm^3+ ions in the crystal phase, and the better performance of fluorescence emission. It was also found that the content of SiO2 in glass matrix could affect the emission efficiency of Tm^3+ in both environments.