CaAl2Si2O8∶Eu, Ce, Tb单基三元掺杂荧光材料的制备及其光谱学特征研究

doi:10.3964/j.issn.1000-0593(2017)06-1804-05

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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.

Key words：CaAl₂Si₂O₈; Rare earths; Photoluminescence spectroscopy; Raman spectroscopy; X-ray diffraction

Received: 2016-08-21 Accepted: 2016-12-25

ZTFLH:

O657.3

Corresponding Authors: DONG Kun E-mail: 272146609@qq.com

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2017)06-1804-05 OR https://www.gpxygpfx.com/EN/Y2017/V37/I06/1804