Ce3+-Mn2+ cooperative Ba9Y2Si6O24 orthosilicate phosphors

Ce3+-Mn2+ cooperative barium-yttrium-orthosilicate phosphors composed of Ba9-3m/2-nCemMnnY2Si6O24 (m=0.005-0.4, n=0-0.5) were prepared using a solid-state reaction. The X-ray diffraction patterns of the resultant phosphors were examined to index the peak positions. The photoluminescence (PL) excitation and emission spectra of the Ce3+-activated phosphors were clearly monitored; furthermore, critical emission quenching as a function of Ce3+ content in the Ba9-3m/2CemY2Si6O24 was observed at relatively low concentrations of the activator. After doping the host structure with Ce3+ and Mn2+ emitters, intense blue and red emission lights observed in the PL spectra under near-ultraviolet (NUV) excitation were monitored. The dependence of the luminescent intensity of the Mn2+ co-doped (n=0, 0.1, 03, and 0.5) host lattices on Ce3+ content (m=0.025, 0.1, and 0.2) was also investigated. Co-doping Mn2+ into the Ce3+-doped host structure enabled high energy transfer from Ce3+ to Mn2+; this energy transfer mechanism is discussed. Using these phosphors, the desired CIE values including emissions throughout the blue and red regions of the spectra were achieved. (C) 2014 Elsevier B.V. All rights reserved.