Ag纳米晶对Tm/Yb共掺碲酸盐玻璃上转换发光性能的影响

Influence of Silver Nanocrystallites on The Upconversion Properties in Tm/Yb Co-doped Tellurite Glasses

在稀土离子掺杂碲酸盐玻璃中引入Ag纳米晶,通过等离子共振(SPR)可使荧光发射得到增强,上转换发光效率得到明显提升。研究了Ag纳米晶对Tm3+/Yb3+共掺碲酸盐玻璃上转换发光的影响,分析了上转换发光机理。结果发现,经过(330℃,30 min)热处理后,玻璃中析出了Ag纳米颗粒,尺寸为5～8 nm。Ag纳米晶的引入可使玻璃上转换蓝、红光由三光子吸收转变为双光子吸收。由于局域场表面等离子体共振增强以及Ag与Tm3+之间的能量转移,使得含Ag纳米晶玻璃的荧光强度比不含Ag纳米晶的玻璃提高了约5倍。

By introducing Ag nanocrystallites into rare earth ions doped tellurite glass, the fluorescence intensity were enhanced through surface plasmon resonance （SPR） , and the up-conversion luminous efficiency were improved obviously. The influence of Ag nanoerystallites on Tin3＋/Yb3 ＋ codoped tellurate glass was studied, and the up-conversion luminescence mechanism was also discussed. The results show that Ag nanocrystallites with the size from 5 to 8 nm were gained by heat treatment under 330 ℃ for 30 min. After introducing Ag nanocrystallites, the three-photon absorption of blue-red transition in glass turn to two-photon absorption. Because of the enhanced local field surface plasmon resonance and the energy transfer between Ag and Tm3＋ , the fluorescence intensity of Ag-contained glass is 5 times more than glass without Ag nanocrystallites.