Color-tunable luminescence and energy transfer properties of Ba3Y1-xMx(PO4)3 (M= Dy, Tm) phosphor with UV light excitation

Abstract A series of powder samples Ba 3 Y 1-x-y (PO 4 ) 3 :xTm 3+ -yDy 3+ were synthesized by a standard solid state reaction. The structure of the compound was confirmed by XRD technique. The concentration quenching of Ba 3 Y 1-x-y (PO 4 ) 3 :xTm 3+ was investigated in detail. The photoluminescence emission and decay measurements of Ba 3 Y 1-x-y (PO 4 ) 3 :xTm 3+ -yDy 3+ revealed the energy transfer from Tm 3+ to Dy 3+ ions under 359 nm excitation. The energy transfer mechanism from Tm 3+ to Dy 3+ in Ba 3 Y 1-x-y (PO 4 ) 3 :xTm 3+ -yDy 3+ phosphors was confirmed. The emitting colors could be tuned form blue to white and then to yellow through adjusting the concentration of Tm 3+ /Dy 3+ ions. Under 353 nm excitation, the corresponding color coordinates of the Ba 3 Y 0.93 (PO 4 ) 3 :0.03Tm 3+ −0.04Dy 3+ phosphors is very close to the stand white color chromaticity coordinates (x=0.33, y=0.33).