Abstract
Single-phase and near-ultraviolet (NUV)–excitable materials composed of Y7(1−2(p+q)/3)Eu7pMn7qO6F9 (p =0.01, 0.05, q =0–0.1) were prepared via a flux-assisted method in reducing atmosphere. X-ray diffraction patterns of the obtained phosphors were examined to index the peak positions. After doping the host structure with Eu2+ and Mn2+ emitters, blue to intense orange emission lights that were observed in the photoluminescence spectra under NUV excitation were monitored. The dependence of the luminescent intensity of the Mn2+ co-doped (q =0.005–0.1) host lattices on the fixed Eu2+ content (p =0.01, 0.05) is also investigated. Co-doping Mn2+ into the Eu2+-doped host structure enabled green and orange Mn2+ transitions in different sites of Y7O6F9 host lattice was attained. Co-doping Mn2+ into the Eu2+-doped host structure enabled clear energy transfer from Eu2+ to Mn2+; this energy transfer mechanism is discussed. With these phosphors, the desired CIE values including emissions from the blue to orange regions of the spectra were achieved.
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