一种新型Ca3Mg3Si4O14∶Eu2+绿色荧光粉的制备及其性能研究

doi:10.3964/j.issn.1000-0593(2017)08-2627-05

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Abstract Green light-emitting Ca₃Mg₃Si₄O₁₄∶Eu²⁺ phosphors were prepared by solid-state reaction using CaCO₃, MgO, SiO₂ and Eu₂O₃ as raw materials. The effects of Eu-doping concentration and fluxes (NH₄Cl, BaF₂) on the crystal structure, luminescence property, and thermal stability of phosphor were studied, which were characterizes by X-ray diffraction (XRD), and photoluminescence (PL) spectra, respectively. The XRD results show that the crystal structure of Ca₃Mg₃Si₄O₁₄∶Eu²⁺ is consistent with the calculated patterns, which investigated the crystal structure of the compound Ca₃Mg₃Si₄O₁₄∶Eu²⁺. The phosphor has strong excitation around 360～450 nm and exhibits a broad emission band with a maximum at 530 nm under 440 nm excitation. With the increase of Eu²⁺ concentration, the phosphor shows a red-shift and the quenching concentration of Eu²⁺ is about 6%. With the introduction of NH₄Cl and BaF₂ as fluxes, the luminous intensity of Ca₃Mg₃Si₄O₁₄∶Eu²⁺ phosphor has been improved. Compared with the luminescence intensity of Ca₃Mg₃Si₄O₁₄∶Eu²⁺phosphor without flux, the photoluminescence intensity increased by 70% when adding NH₄Cl as flux. Furthermore, the emission intensity reduced by only 7.6% and 14% at 150 ℃ for Ca₃Mg₃Si₄O₁₄∶Eu²⁺ phosphor and commercial green phosphor. The Ca₃Mg₃Si₄O₁₄∶Eu²⁺ phosphor also possesses high thermal stability, and these luminescnce properties indicate that Ca₃Mg₃Si₄O₁₄∶Eu²⁺ phosphor is a promising green phosphor for use in solid-state white lighting.

Key words： Phosphor Luminescence properties Flux Thermal stability

Received: 2016-07-05 Accepted: 2017-01-16

ZTFLH:

O462.3

Corresponding Authors: WANG Le E-mail: calla@cjlu.edu.cn

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2017)08-2627-05 OR http://www.gpxygpfx.com/EN/Y2017/V37/I08/2627