光谱学与光谱分析 |
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Preparation and Up-Conversion Luminescence Dynamic Process of Yb3+/Er3+ Co-Doped BaGd2ZnO5 |
YANG Yan-min1, JIAO Fu-yun1, SU Hong-xin1*, LI Zi-qiang1, LIU Yun-feng2, LI Zhi-qiang1, YANG Zhi-ping1 |
1. College of Science and Technology, Hebei University, Baoding 071002, China 2. Industrial and Commercial College, Hebei University, Baoding 071002, China |
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Abstract Yb3+/Er3+ co-doped BaGd2ZnO5 phosphors were prepared by using the sol-gel method. The up-conversion luminescence powers and efficiencies were measured under different excitation densities. The obtained data showed that the green luminescence power was proportional to the second-order of that of the excitation power under the lower excitation density and linearly in the higher one. The up-conversion mechanism under different excitation power was described by a rate equation. Yb3+/Er3+ co-doped BaGd2ZnO5 was excited by 971 nm LD laser with a square wave signal modulation and the rise and decay processes of green up-conversion luminescence were measured. In a low excitation condition, the rate equation of the energy level 4S3/2 for Er3+ ions was used to fit the green rise and decay processes in order to fix the relevant parameters, and confirm that the population of 4S3/2 energy level of Er3+ ion mainly came from the energy transfer from Yb3+ to Er3+.
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Received: 2012-05-02
Accepted: 2012-07-28
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Corresponding Authors:
SU Hong-xin
E-mail: hongxinsu@163.com
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