Ce3+–Mn2+ cooperative Ba9Y2Si6O24 orthosilicate phosphors

Abstract

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, 0.3, 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.