Single-phase tunable white-light-emitting Sr3La(PO4)3: Eu2+, Mn2+phosphor for white LEDs.
A novel, near-ultraviolet-excited white-light-emitting phosphor Sr3La(PO4)3:Eu2+, Mn2+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 Eu2+and Mn2+, 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 Eu2+and Mn2+in the Sr3La(PO4)3:Eu2+, Mn2+phosphors. Resonant energy transfer from Eu2+to Mn2+ions has been demonstrated to be a dipole-dipole mechanism in Sr3La(PO4)3. The energy transfer efficiency increases with Mn2+concentration increasing, and reaches a maximum of 55.6%.
Zhijun
Z
Wang
Shuqin
S
Lou
Panlai
P
Li
Zhenggang
Z
Lian