Tricolor white emitting phosphor co-doped with Eu, Dy in SiO2 matrix |
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Authors: | XiaoYun Hu Jun Fan DeKai Zhang YiPing Ma JinTao Bai ZhaoYu Ren Xun Hou |
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Institution: | (1) Department of Physics, Northwest University, Xi’an, 710069, China;(2) School of Chemical Engineering, Northwest University, Xi’an, 710069, China;(3) Institute of Photonics & Photon-Technology, Provincial Key Laboratory of Photo Electronic Technology, Northwest University, Xi’an, 710069, China;(4) State Key Laboratory of Transient Optics and Technology, Xi’an Institute of Optics & Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710068, China |
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Abstract: | A Eu, Dy co-doped SiO2 matrix, white emitting phosphor was prepared by the sol-gel technique. Strong red, green and blue emissions located at 618
nm, 573 nm and 400–550 nm were observed under UV laser excitation at room temperature. Such techniques as FT-IR and TGA-DSC
were used to measure the microstructure of the luminescent material. The influence of the preparation techniques on the luminescence
property of the Eu, Dy co-doped SiO2 matrix, such as anneal temperature, anneal time, dried atmosphere and the components of the matrix, was systematically studied,
and the luminescence mechanism was interpreted. The red emission is the strongest when annealed at 750°C. However, blue emission
appears when annealed at 700°C and is the intensest at 900°C. For the samples dried in vacuum, Eu3+ is more easily deoxidized to Eu2+ at lower temperatures, because the samples dried in the air compared with that dried in vacuum need higher temperature to
form network structures. Only the SA and SAB matrix annealed at 850°C had blue emission in the four matrices (SA, SAB, SB,
S) xerogel and the emission in the SAB matrix was stronger than that in the SA matrix. This may be due to the eutectic phase
formed by the oxide boron, alkaline oxide and alumina in the SAB matrix, which constructs network structures and stabilizes
the emission center and enhances the blue emission.
Supported by the National Natural Science Foundation of China (Grant No. 20876125) and the Technology Research Project of
Higher Education Office in Shaanxi Province (Grant No. 08JK451) |
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Keywords: | tricolor white-light sol-gel phosphor rare earth doped SiO2 matrix |
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