Abstract
A series of luminescent emission-tunable phosphors Ca8NaGd(PO4)6F2: Eu2+, Mn2+ have been prepared by a combustion-assisted synthesis method. The X-ray diffraction measurement results indicate that the crystal structure of the phosphor is a single phase of Ca8NaGd(PO4)6F2. The photoluminescence (PL) properties of Eu2+ and Mn2+-codoped Ca8NaGd(PO4)6F2 phosphors were also investigated. The phosphors can be efficiently excited by ultraviolet (UV) light and show a blue emission band at about 450nm and a yellow emission band at about 574nm, which originated from the Eu2+ ions and the Mn2+ ions, respectively. The efficient energy transfer from the Eu2+ ions to the Mn2+ ions was observed and its mechanism should be a resonant type via a nonradiative dipole–quadrupole interaction. A color-tunable emission in Ca8NaGd(PO4)6F2 phosphors can be realized by Eu2+→Mn2+ energy transfer. Our results indicate that the developed phosphor may be used as a potential white emitting phosphor for UV based white LEDs.
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