Eu³⁺ doped yttrium orthosilicate (Y₂SiO₅) phosphor was prepared by the sol-combustion method using citric acid as complexing agent in this experiment. The X-ray diffraction (XRD) pattern, excitation and emission spectra were used to investigate the crystal structure and luminescent properties of the phosphor. XRD pattern showed that pure Y₂SiO₅:Eu³⁺ phosphor was obtained. The excitation spectrum was composed of a broad band from 200-350 nm and a series of narrow bands from 350-500 nm, in which the excitation peaks at 400 nm and 470 nm were stronger. The emission spectrum showed the most intense emission peak was located at 613 nm, which corresponded to the ⁵D₀→⁷F₂ transition of Eu³⁺. The results showed that this phosphor could be excited by UV or blue light and emit red light. The luminescent intensity depends on the concentration of Eu³⁺ and it reached the maximum when the molar concentration of Eu³⁺ was 4 mol%. In this study, we found that the emission intensity reached maximum when the ratio of citric acid and Y³⁺ was 1.5:1. The results indicated that Y₂SiO₅:Eu³⁺ is a potential red-emitting candidate phosphor for white light-emitting diodes.

Date Published: 15 November 2010
PDF: 6 pages
Proc. SPIE 7852, LED and Display Technologies, 78521I (15 November 2010); doi: 10.1117/12.871775

Published in SPIE Proceedings Vol. 7852:
LED and Display Technologies
Gang Yu; Yanbing Hou, Editor(s)