Energy transfer and upconversion emission of Er³⁺/Tb³⁺/Yb³⁺ co-doped transparent glass-ceramics containing Ba₂LaF₇ nanocrystals under heat treatment

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• 作者：Ho Kim Dan ; Dacheng Zhou ; Rongfei Wang ; Xue Yu ; Qing Jiao ; Zhengwen Yang ; Zhiguo Song ; Jianbei Qiu
• 关键词：Upconversion ; Ba2LaF7 ; Glass-ceramics ; Energy transfer ; Er3+/Tb3+/Yb3+
• 刊名：Optical Materials
• 出版年：January, 2014
• 年：2014
• 卷：36
• 期：3
• 页码：639-644
• 全文大小：1623 K

文摘

Transparent glass-ceramics SiO₂-AlF₃-BaF₂-TiO₂-LaF₃ (SABTL) containing Ba₂LaF₇ nanocrystals were successfully prepared by heat treatment process through conventional melting method. The crystal size in the glass-ceramics increased gradually under the changing of heat treatment temperatures and times, which was confirmed by the results of XRD, TEM measurements. The intensity of the blue, green and red upconversion luminescence around 490 nm, 525 nm, 546 nm, 657 nm which originate from the transitions ⁵D₄ 鈫?#xA0;⁷F_J (J = 6 and 5) of Tb³⁺ ions and (²H_11/2, ⁴S_3/2, ⁴F_9/2) 鈫?#xA0;⁴I_15/2 transitions of Er³⁺ ions, respectively, were strongly observed after heat treatment under 980 nm laser diode excitation. The intensity of upconversion luminescence was increased gradually with the increase of Yb³⁺ concentrations and reaches its maximum at 2.5 mol%. The upconversion luminescence and energy transfer process between Tb³⁺_, Yb³⁺ and Er³⁺ ions in the glass-ceramics were discussed.