Compositional dependences on the mechanism of upconversion in Nd3+/Tm3+ co-doped chalcohalide glasses
Compositional dependences on the mechanism of upconversion in Nd3+/Tm3+ co-doped chalcohalide glasses
复制标题
DOI：
10.1016/j.jnoncrysol.2010.12.019
复制
发表时间：
2011-06
影响因子：
3.5
通讯作者：
Jihong Zhang;J. Heo;Xiujian Zhao;W. J. Chung
中科院分区：
文献类型：
--
作者：
Jihong Zhang;J. Heo;Xiujian Zhao;W. J. Chung
研究了Nd3+/Tm3+共掺Ge-Ga-S-CsBr乙醇化玻璃蓝光发射的组分依赖机理。随着玻璃中CsBr/Ga比的增加，Tm3+:1G4→3h6跃迁引起的蓝色上转换发光（以475nm为中心）减少，而Nd3+离子引起的其他上转换发光则增加。CsBr的加入改变了稀土离子的局部环境，显著增加了Nd3+离子内部的激发态吸收。这导致Nd3+→Tm3+的能量传递速率降低，导致蓝色上转换发射大幅下降。
Mechanisms of the compositional dependence of blue emission from Nd3+/Tm3+co-doped Ge–Ga–S–CsBr chalcohalide glasses were investigated. The blue upconversion emissions (centered at 475nm) due to the Tm3+:1G4→3H6transition decreased as the CsBr/Ga ratio in glasses while the other upconversion emissions from the Nd3+ions increased. Changes in the local environment of rare-earth ions incurred by the CsBr addition significantly increased the excited state absorption within Nd3+ions. This resulted in the decrease in the Nd3+→Tm3+energy transfer rates that led to the large decrease in blue upconversion emission.