硅酸盐学报Issue(7)：952-958,7.DOI:10.14062/j.issn.0454-5648.2015.07.16
白光 LED 用红色发光材料 CaLa2（MoO4）4：Eu3+的微波辅助溶胶-凝胶法合成及发光特性
Synthesis and Luminescent Properties of CaLa2(MoO4)4:Eu3+ Red-emitting Phosphors for White LED by Microwave-assisted Sol-gel Method
摘要
Abstract
The red-emitting CaLa2(MoO4)4:Eu3+ powders were prepared by a microwave-assisted sol-gel method, with citric acid as a chelating agent. The heat decomposion mechanism of the precursor, phase structure, morphology and luminescent properties of the samples were characterized. The influences of calcining temperature, Eu3+ content, mole ratio of citric to ethylene glycol (EG) and the dosage of H3BO3 on the luminescent properties of the samples were investigated. The results indicate that the target products of CaLa2–x(MoO4)4:xEu3+ are synthesized by calcining precursor in a temperature range from 700 ℃ to 900 ℃. The products are readily indexed to a pure tetragonal phase with scheelite structure. The excitation spectra consist of a broad band at 250–350 nm and the intense lines at 395 nm and 464 nm. The former is attributed to the Mo–O and Eu–O charge transfer transition, and the latter is due to 4f–4f transitions of Eu3+ ions. In the emission spectra, the main peak centered at 616 nm corresponds to the 5D0→7F2 electronic dipole transition. The luminescence intensity of the sample obtained at 800 ℃ is the maximum, and it increases gradually with the increase of Eu3+ concentration. Little concentration quenching occurs when the value of x is in the range of 0.2–1.0. In addition, the addition of an appropriate amount of ethylene glycol in the solvent may contribute to the grain refinement and the powder dispersion. A high concentration of ethylene glycol will reduce the luminescence intensity of the sample. The dosage of flux H3BO3 has a great effect on the luminescence intensity of the sample. When the dosage of H3BO3 is 3%, the luminescence intensity of the sample shows better luminescent properties.关键词
钼酸镧钙/铕离子/微波辅助溶胶-凝胶法/红色发光粉Key words
lanthanum calcium molybdate/europium ion/sol-gel method assisted by microwave/red-emitting phosphors分类
数理科学引用本文复制引用
翟永清,李金航,李璇,宋珊珊,曹丽丽..白光 LED 用红色发光材料 CaLa2（MoO4）4：Eu3+的微波辅助溶胶-凝胶法合成及发光特性[J].硅酸盐学报,2015,(7):952-958,7.基金项目
国家自然科学基金(21301046)资助项目。 （21301046）
