Green color luminescence in Tb3+: (La,Ln)PO4 (Ln=Gd or Y) photonic materials

We report the results of the time-resolved emission spectra and the decay curves, concerning the important green emission transition at 544 nm ( 5 D 4 → 7 F 5 ). Five other transitions at 489 nm ( 5 D 4 → 7 F 6 ), 585 nm ( 5 D 4 → 7 F 4 ), 620 nm ( 5 D 4 → 7 F 3 ), 674 nm ( 5 D 4 → 7 F 2 ) and 648 nm ( 5 D 4 → 7 F 1 ) of Tb 3+ : (La,Y)PO 4 and (La,Gd)PO 4 were measured to understand the influences of the wavelengths of excitation, in emitting green color from these two novel phosphor materials. It was observed that the spectral features possess sharp and bright emission for potential applications on the monitors of the television and some other related electronic systems, in observing the images in green color.