Citric sol-gel synthesis and luminescence characteristics of Ca sub(1-y)Sr sub(y)La sub(2-x)Eu sub(x) ZnO sub(5) phosphors

• Published in: Journal of materials science. Materials in electronics Vol. 26; no. 8; pp. 5618 - 5624
• Main Authors: Li, Bingyan, Liu, Yunfei, Lu, Yinong, Zhang, Xue, Song, Fei, Yang, Fengling
• Format: Journal Article
• Language: English
• Published: 01.08.2015
• Subjects: Emission; Emission spectroscopy; Field emission; Luminescence; Phosphors; Scanning electron microscopy; Sol gel process; Strontium
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-015-3111-3

The emission-tunable CaLa sub(2-x)Eu sub(x)ZnO sub(5) phosphors were synthesized by citric sol-gel method. The products were characterized by X-ray diffractometer, scanning electron microscope, energy dispersive spectroscopy and photoluminescence spectrometer. Through adjusting the dopant concentration of Eu super(3+) in CaLa sub(2)ZnO sub(5) phosphor, blue-green to orange-red emission with the 467 nm excitation could be obtained, which matches well with the emission of blue LED chip. Luminescence properties of Ca sub(1-y)Sr sub(y)La sub(1.9)Eu sub(0.1)ZnO sub(5) (0 less than or equal to y less than or equal to 1) indicated that increasing Sr super(2+) content enhances not only the emission intensity of super(5)D sub(0) arrow right super(7)F sub(2) transition but also the emission intensity ratio of super(5)D sub(0) arrow right super(7)F sub(2) to super(5)D sub(0) arrow right super(7)F sub(1) (asymmetry ratio). The Ca sub(0.6)Sr sub(0.4)La sub(1.9)Eu sub(0.1)ZnO sub(5) phosphors possess optimal integrated emission intensity, which is 20 % higher than that of CaLa sub(1.9)Eu sub(0.1)ZnO sub(5) phosphors, and the Commission International de L'Eclairage chromaticity coordinate is (0.658, 0.341). Ca sub(1-y)Sr sub( y)La sub(2-x)Eu sub(x)ZnO sub(5) phosphors may have potential applications in field emission displays based on their particle size, low-cost synthetic route, and diverse luminescent properties.