Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1496379 | Optical Materials | 2009 | 4 Pages |
Abstract
A Eu, Dy co-doped SiO2 matrix xerogel with blue emission was prepared by the sol-gel method. Strong blue emission located between 425 nm and 525 nm with a peak at 486 nm is observed under UV laser excitation at room temperature, which is related to a 4f â 5d energy transition of Eu2+. Such techniques as FT-IR and TGA-DSC were used to measure the microstructure of the luminescent materials. The influence of Dy3+ ions on the luminescent property of Eu2+ was investigated. The emission intensity of Eu, Dy-codoped samples is stronger than that of Eu doped samples. The emission enhancement mechanism relating to Eu2+ is attributed to an energy transfer involving Dy3+ â Eu2+. Using energy transition theory, we speculate that the mechanism may be one of the resonance transfers via multi-polar interactions, and present a possible energy transfer model. The Eu2+ blue emission intensity reaches the maximum when the Dy3+ concentration is 0.1 mol%. When the concentration of Dy3+ is 0.3 mol%, a fluorescence quenching appears which might be related to the overlap part of Eu2+ excitation and emission levels, and also suggests the existence of Eu2+ â Eu2+ energy transfer.
Related Topics
Physical Sciences and Engineering
Materials Science
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Authors
Xiaoyun Hu, Jun Fan, Jing Pan, Jianhua Gao, Ting Li, Dekai Zhang, Xinliang Zheng, Dong Jiang, Enzhou Liu,