Luminescent properties of rare earth-activated Y1-XGdXVO4 phosphor thin films

摘要

Full-color emitting multicomponent oxide phosphors composed of YVO4 and GdVO4, doped with rare earth have been newly developed. The Y1XGdXVO4 phosphor thin films were deposited on thick BaTiO3 ceramic sheets by r.f. magnetron sputtering using powder targets and then postannealed at 1000 8C in air. A high-luminous efficiency for red, green or blue emissions in photoluminescence (PL) and cathodoluminescence (CL) was obtained in Y1XGdXVO4 phosphor thin films doped with Eu, Er or Tm, respectively. Full-color emissions in PL were obtained in Y1XGdXVO4/Eu,Er,Tm phosphor thin films prepared by controlling the amount of Eu, Er and Tm and the composition (X). White PL emission was obtained under N2 laser excitation in a Y0.2Gd0.8VO4/ Eu,Er,Tm thin film with a Eu, Er and Tm content of 0.2, 0.7.and 1 at.%, respectively: CIE chromaticity color coordinates, (X=0.354 and Y=0.345). In addition, a luminance of 3.2 cd/m2 in white emission was obtained in a thin-film electroluminescent (TFEL) device made with this thin film: driving voltage at 10 kHz.