Abstract

A novel, near-ultraviolet-excited white-light-emitting phosphor ${\mathrm{Sr}}_3\mathrm{La}{({\mathrm{PO}}_4)}_3\text{:}{\mathrm{Eu}}^{2+}$, ${\mathrm{Mn}}^{2+}$ was synthesized by the solid-state method. Luminescence properties and the energy transfer mechanism were investigated in detail by photoluminescence spectra and decay curves. With the energy transfer between ${\mathrm{Eu}}^{2+}$ and ${\mathrm{Mn}}^{2+}$, a cold white light with chromaticity coordinates of (0.2790, 0.2273), correlated color temperature of 6501 K, Ra of 70, and external quantum efficiency of 35.5% was realized by changing the ratios of ${\mathrm{Eu}}^{2+}$ and ${\mathrm{Mn}}^{2+}$ in the ${\mathrm{Sr}}_3\mathrm{La}{({\mathrm{PO}}_4)}_3\text{:}{\mathrm{Eu}}^{2+}$, ${\mathrm{Mn}}^{2+}$ phosphors. Resonant energy transfer from ${\mathrm{Eu}}^{2+}$ to ${\mathrm{Mn}}^{2+}\mathrm{ions}$ has been demonstrated to be a dipole–dipole mechanism in ${\mathrm{Sr}}_3\mathrm{La}{({\mathrm{PO}}_4)}_3$. The energy transfer efficiency increases with ${\mathrm{Mn}}^{2+}$ concentration increasing, and reaches a maximum of 55.6%.

© 2017 Optical Society of America

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