Abstract

Tm³⁺-Yb³⁺ codoped transparent oxyfluoride glass ceramics containing LaF₃ nanocrystals were obtained by thermal treatment on the as-made glasses. The formation of LaF₃ nanocrystals and the incorporation of Tm³⁺ and Yb³⁺ into LaF₃ nanocrystal lattice were confirmed by X-ray diffraction and high resolution transmission electron microscopy. Infrared quantum cutting involving Yb³⁺ 950-1100 nm (²F_5/2�?? ²F_7/2) emission was achieved upon the excitation of the ¹G₄ energy level of Tm³⁺ at 468 nm. We measured the photoluminescence properties of these glass ceramics. We also investigated the thermal treatment duration dependent quantum efficiency, and found that the quantum efficiency is 13% increased for the 0.5Tm³⁺-4Yb³⁺ doped glass ceramic with a maximum value of 144%, and 16% increased for the 0.5Tm3+-8Yb3+ doped glass ceramic with a maximum value of 162%, respectively.

© 2008 Optical Society of America

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History
Original Manuscript: April 3, 2008
Manuscript Accepted: May 22, 2008
Revised Manuscript: May 21, 2008
Published: June 3, 2008

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Author Affiliations

Song Ye, Bin Zhu, Jin Luo, Jingxin Chen, Gandham Lakshminarayana, Jianrong Qiu

Zhejiang University

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