Photoluminescence Study of LaPO4:Ce,Er,Tb Phosphor

LaPO4 :Ce,Tb is a well known green emitting phosphor, used commercially for display devices. Erbium at 1 mole percent acts as a sensitizer to LaPO4 :Ce,Tb Phosphor, and allowed the other emissions of Ce and Tb. It is interesting to note that on addition of Erbium the peak at 525nm due to Tb was missed and 545 nm was emitted with enhanced intensity by allowing other emissions of Tb and Ce. The present paper reports the synthesis and photoluminescence studies of LaPO4 : Ce 1%, Er 1% and Tb with various concentrations from 0.5 to 2.0% Phosphors, at 268nm excitation. The phosphors are prepared using Standard Solid State Reaction (SSR) method at a calcinating temperature of 1250 o C for 3 hours. Well indexed peaks at 488 and 545nm are observed with very good intensity and are due to transitions of Tb. The peaks at 381, 415 and 436nm, the blue region are due to the transitions of Ce along with 585 and 620 nm due to Tb are observed with less intensities.