Research Article
Niyaz P Shaik, N V Poornachand
Abstract
Pure LaPO4 and LaPO4 :Ga3+ (0.5 mol%) phosphor was synthesized by the conventional solid-state reaction method. Photoluminescence (PL) properties of pure LaPO4 and LaPO4 :Ga3+ phosphor was investigated.The excitation spectrum of pure LaPO4 and LaPO4 :Ga3+ phosphor monitored under 400nm wavelength was characterized by a broad band ranging from 220-280nm with a maximum intensity peak at 249nm(4.98eV) and 248nm(5.0eV) respectively.Upon excitation at 254nm wavelength, the emission spectrum of pure LaPO4 and LaPO4 :Ga3+ phosphor emits a broad band range from 400-650nm with maximum intensity peak at 469nm(2.64eV, Blue) and 594nm(2.08eV, Red) with the full width at half maximum (3nm). The color coordinates for the LaPO4 :Ga3+ (0.5 mol%) phosphor are x=0.5691 and y= 0.4303. LaPO4 :Ga3+ (0.5 mol%) phosphor having excellent colour tunability of red light.