Up-conversion luminescence properties and energy transfer of Er^3＋/Yb^3＋ co-doped oxyfluoride glass ceramic containing CaF2 nano-crystals

• Published in: 中国物理B：英文版 2014 (5), p.574-578
• Main Author: 马辰硕 焦清 李龙基 周大成 杨正文 宋志国 邱建备
• Format: Article
• Language: English
• Subjects: 上转换发光性质; 共掺杂; 晶体尺寸; 氟化钙晶体; 氟氧化物玻璃陶瓷; 纳米晶体; 能量传递过程; 透射电子显微镜
• ISSN: 1674-1056; 2058-3834

The Er^3＋/yb^3＋ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy （TEM） images showed that CaF2 nano-crystals of 20-30 nm in diameter precipitated uniformly in the glass matrix. luminescence of Er^3＋ at 540 nm and 658 nm was observed in Comparing with the host glass, high efficiency upconversion the glass ceramics under the excitation of 980 nm. Moreover, the size of the precipitated nano-crystals can be controlled by heat-treatment temperature and time. With the increase of the nano-crystal size, the intensity of the red emission increased more rapidly than that of the green emission. The energy transfer process of Er^3＋ and Yb^3＋ was convinced and the possible mechanism of Er^3＋ up-conversion was discussed.