抄録
Y2O3:Eu3+ red phosphor was prepared by the solvothermal synthesis using precursors, yttrium nitrate hydrate 0.001mol [Y(NO3)3 . 6H2O] and europium nitrate hydrate [Eu(NO3)3 . 5H2O], of metal salts in isopropyl alcohol-water solutions at 200°C for 5 hours. When the prepared phosphor powder sample was annealed at 1200°C for 4 hours, X-ray diffraction peaks for annealed powder were the evidences for cubic cell formation of Y2O3 with lattice parameter, a =10.6198Å, which was closely compatible to previously reported data(JCPDS Card File, 41-1105 a=10.6041Å). Typically, this morphology was a group of hexagonal flakes whose size was about 10 - 20μm in length and about 0.5 - 1μm in thickness. The emission intensity of Y2O3:Eu3+ red phosphor was characterized by changing activator concentrations and heat-treatment temperatures. The maximum emission intensity of this phosphor was obtained when the Eu concentration was 2 mole%.
