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| Preparation and Spectroscopic Characteristics of CaAl2Si2O8∶Eu, Ce, Tb Fluorescent Material |
| XU Dan-zhi1, FENG Jing1, YANG Xiao-yun2, ZU En-dong1, CUI Xiao-ying2, LIN Jin-chang2, DONG Kun2* |
1. School of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China |
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Abstract CaAl2Si2O8∶Eu, Ce, Tb fluorescent material were synthesized with high temperature solid phase method.The fluorescent materials were characterized with fluorescence spectroscopy (PL), Raman spectroscopy (Raman) and X-ray diffraction (XRD).The phase compositions of the samples were studied with XRD. It was shown that the Eu2+ substitution of Ca2+ did not induce the changes of the structure of the matrix. Raman spectroscopy confirmed the presence of silicon-oxygen tetrahedron and aluminum oxygen tetrahedrons. Raman spectra also confirmed that the amount of Eu2+ substitution Ca2+ was related to the degree of crystal morphology distortion. PL spectra of the samples shows that the emission peak at 325 nm wavelength excitation, the emission peak of the sample was shown to be a strong emission peak at 426 nm (blue region) and a weak emission peak at 541 nm (green region). The emission peaks can be fitted with Gaussian to three fitting peaks at 393, 419 and 474 nm. After combining the analysis and comparison, and ultimately determine when Eu∶Ce∶Tb=1∶1∶1. 5 the sample shows the strongest fluorescence intensity. CIE chromaticity diagram shows that the samples are emitting blue fluorescence. The material has good color rendering, color temperature is low, which is a kind of suitable blue fluorescent LED material with ultraviolet and near ultraviolet excitation.
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Received: 2016-08-21
Accepted: 2016-12-25
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Corresponding Authors:
DONG Kun
E-mail: 272146609@qq.com
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