标题：
Synthesis and luminescence enhancement of CaySr4-x-yAl2O7:xEu(2+) phosphors by a novel halide-assisted solid-state reaction method
点击次数：
所属单位：
材料科学与技术学院
发表刊物：
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
关键字：
RED-EMITTING PHOSPHORS NANOCRYSTALLINE HYDROXYAPATITE LEDS IONS PHOTOLUMINESCENCE OXYNITRIDE MAGNESIUM EMISSION POWDERS DIODES
摘要：
Eu2+ doped strontium aluminate phosphors CaySr4-x-yAl2O7:xEu(2+) (0 x 0.1, 0 y 0.1) were synthesized via a novel halide-assisted solid-state reaction method. The phase structure and photoluminescence properties of CaySr4-x-yAl2O7:xEu(2+) were characterized via X-ray diffraction (XRD) and fluorescence spectrophotometer. The XRD patterns indicate that the alpha-Sr4Al2O7 phase structure with negligible impurities were produced in the samples of CaySr4-x-yAl2O7:xEu(2+) (x 0.1 and y 0.1) at 1450 A degrees C. Photoluminescence results show that the CaySr4-x-yAl2O7:xEu phosphor with NH4I as reductant presents typical intense Eu2+ red emission bands centered at 610 nm while excited by 450 nm. Accordingly, samples without NH4I only exhibit two weak Eu3+ emission peaks located at 598 and 619 nm, respectively. It can be ascribed to the reduction characteristic of I- ion. Furthermore, by partial replacement of Sr2+ with Ca2+ in Sr4Al2O7 host, the emission intensity is enhanced up to 260% with emission peak red shifted by 5-10 nm. These results indicate that partial substitution of Sr2+ by Ca2+ is an efficient way to increase the proportion of longer wavelength emission and luminescence intensity for Sr4Al2O7:Eu phosphors.
ISSN号：
0957-4522
是否译文：
否
发表时间：
2018-06-01
合写作者：
He, Qinjiang,Zhu, Haitao,He, Hong,Song, Xiufeng,Liu, Xuhai
通讯作者：
傅仁利
发表时间：
2018-06-01
学位：工学博士学位
职称：教授
所在单位：材料科学与技术学院