The effect of different lattice sites substitution on photoluminescence characteristics of Eu2+/Ce3+ doped M5(ZO4)3X

The empirical formula of Van Uitert is applied to calculating the emission wavelengths of haloapatite and silicon apatite phosphors doped with Eu2+/Ce3+. The relationship between emission wavelengths and occupied lattice sites of Eu2+/Ce3+ is discussed in haloapatite crystal. For phosphors of haloapatite and silicon apatite doped with Eu2+, the emission bands of the long-wave region are interpreted reasonably. Phosphors Sr5(PO4)2SiO4 doped with Eu2+/Ce3+ are synthesized by high temperature solid state reaction under two different atmospheres, the spectral characteristics of Eu2+/Ce3+ occupying different lattice sites are studied. The luminescent materials Sr5(PO4)2SiO4 doped with Eu2+/Ce3+ are promising blue-green phosphors for application in white-LEDs.