Preparations of (Y1-xGdx)2O3:Eu3+ Phosphors Particles by Solvothermal Synthesis Using the 2-Methoxy Ethanol

Abstract

(<TEX>$Y_{l-x}$</TEX> <TEX>$Gd_{x}$</TEX> )<TEX>$O_2$</TEX><TEX>$_3$</TEX>: <TEX>$Eu^{ 3＋}$</TEX> red phosphors were prepared with the solvothermal synthesis using the 2-methoxy-ethanol solvents and the emission intensity was investigated that applied with the 254 nm wavelength and the maximum excitation wavelength for energy source. The used solvents for the solvothermal synthesis were made of nitrate salt solutions of Y, Gd and Eu. These solutions dropped in autoclave have be reacted with the solvothermal synthesis at <TEX>$200^{\circ}C$</TEX> for 5hrs and the red phosphors prepared here in were showed the pure cubic phase after annealing at <TEX>$1000∼1200^{\circ}C$</TEX>. The brightness of (<TEX>$Y_{l-x}$</TEX> <TEX>$Gd_{x}$</TEX>)<TEX>$_2$</TEX><TEX>$O_3$</TEX>: <TEX>$Eu^{3＋}$</TEX> phosphors particles was increased as an increase of Gd ratio. The maximum excitation wavelengths of (<TEX>$Y_{l-x}$</TEX> <TEX>$Gd_{x}$</TEX> )<TEX>$_2$</TEX><TEX>$O_3$</TEX>: <TEX>$Eu^{3＋}$</TEX> / phosphors particles were increased according to increasing Gd ratio from 253 nm to 259 nm wavelength. The maximum emission intensity of <TEX>$Gd_2$</TEX><TEX>$O_3$</TEX>: <TEX>$Eu^{3＋}$</TEX> (Y/Gd = 1/0) phosphors particles under UV 259 nm was found to be higher than the commercial product of <TEX>$Y_2$</TEX><TEX>$O_3$</TEX>: <TEX>$Eu^{3＋}$</TEX> phosphors.