Up-conversion of Er³⁺/Yb³⁺ co-doped transparent glass-ceramics containing Ba₂LaF₇ nanocrystals

详细信息    查看全文

• 作者：Ho Kim Dan ; Dacheng ZHOUA ; Wang Rongfei ; Tran Minh Hau ; Qing JIAO ; Xue YU ; Jianbei QIU
• 关键词：up-conversion ; Ba2LaF7 ; nanocrystals ; glass-ceramics ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：31
• 期：9
• 页码：843-848
• 全文大小：1340 K

文摘

The up-conversion of Er³⁺/Yb³⁺ co-doped transparent glass-ceramics 50SiO₂-10AlF₃-5TiO₂-30BaF₂-4LaF₃-0.5ErF₃-0.5YbF₃ containing Ba₂LaF₇ nanocrystals under the changing of heat treatment temperature and time were investigated. The Ba₂LaF₇ nanocrystals precipitated from the glass matrix was confirmed by X-ray diffraction (XRD). The structural investigation carried out by XRD and transmission electron microscopy (TEM) evidenced the formation of cubic Ba₂LaF₇ nanocrystals with crystal size of about 14 nm. Comparing with the samples before heat treatment, the high efficiency up-conversion emission of Er³⁺/Yb³⁺ co-doped samples was observed in the glass-ceramics under 980 nm laser diode excitation. The increase in red emission intensity bands was stronger than the green bands when the crystal size increased. The mechanism for the up-conversion process in the glass-ceramics and the reasons for the increase of Er³⁺/Yb³⁺ co-doped up-conversion intensity after heat treatment were discussed.