Cooperative Energy Transfer Up-Conversion and Quantum Cutting Down-Conversion in Yb3+:TbF3 Nanocrystals Embedded Glass Ceramics

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• 作者：Daqin Chen ; Yunlong Yu ; Yuansheng Wang ; Ping Huang ; Fangyi Weng
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：April 23, 2009
• 年：2009
• 卷：113
• 期：16
• 页码：6406-6410
• 全文大小：265K
• 年卷期：v.113,no.16(April 23, 2009)
• ISSN：1932-7455

文摘

Yb³⁺-doped oxyfluoride glass ceramics were fabricated by melt-quenching and subsequent heating. X-ray diffraction and high-resolution transmission electron microscopy analyses evidenced that orthorhombic TbF₃ nanocrystals with a mean size of 22 nm were homogeneously precipitated among the aluminosilicate glass matrix. The incorporation of Yb³⁺ ions into TbF₃ crystals was confirmed by energy-dispersive X-ray spectroscopy. Under 976 nm near-infrared laser excitation, the glass ceramics exhibited intense green Tb³⁺:⁵D₄ → ⁷F_J (J = 3, 4, 5, 6) up-conversion luminescence due to the cooperative energy transfer from two Yb³⁺ ions to one Tb³⁺ ion. In comparison, under 485 nm excitation, they yielded near-infrared quantum cutting down-conversion emission corresponding to Yb³⁺:²F_5/2 → ²F_7/2 transition, ascribing to the cooperative energy transfer from one Tb³⁺ ion to two Yb³⁺ ions. The energy transfer processes between Tb³⁺ and Yb³⁺ ions were discussed, and the energy transfer efficiency was evaluated.