Studies on the synthesis of europium activated yttrium oxide by wet-chemical method--1. Influence of precursor quality on phosphor photoluminescence properties

摘要

Europium activated yttrium oxide phosphor powders (Y_2O_3: Eu~(3+)) were prepared from yttrium-europium precursors obtained by wet-chemical method. With this purpose in view, precursors were prepared using the reagent simultaneous addition SimAdd technique from yttrium-europium nitrate and chloride as rare-earth supplier and urea, ammonium oxalate, ammonium carbonate and oxalic acid as precipitating agents. Precursors, obtained under controlled concentration, temperature and pH conditions, were fired at 1200 deg C in order to generate Y_2O_3: Eu~(3+) phosphor powders. Yttrium-europium precursors and Y_2O_3 :Eu~(3+) phosphor powders were investigated by FTIR, TGA-DTA, X-ray diffraction (XRD), scanning electronic microscopy (SEM) and photoluminescence spectroscopy (PL) in order to put in evidence the influence of the quality of yttrium-europium precursors obtained by wet-chemical method, using the SimAdd technique on the properties of Y_2O_3:Eu~(3+) phosphor powders.