Preparation and photoluminescence properties of LaGaO₃:0.05Tb³⁺ green phosphors

LaGaO3:0.05Tb(3+) green phosphors were prepared via high--temperature solid--phase calcination at a temperature of 1300 degrees C for 4 h in a reducing environment. The crystalline structure, microscopic morphology and luminescence of the phosphor samples were characterized using X-ray diffractometer (XRD), scanning electron microscope (SEM) and fluorescence spectrometer (PL), respectively, alongside a deployment of color coordinate calculation software (CIE). The results showed that the LaGaO3:0.05Tb(3+) green phosphors were pure in terms of phase composition and had complete crystalline structure with regular morphology and uniform particle distribution. The photoluminescence process involved the 4f -> 5d -> 4f energy level transition of Tb3+, in which the excitation peak was located at 378 nm and the emission peak was found at 545 nm. The color coordinate of the LaGaO3:0.05Tb(3+) phosphor was determined as (0.3481, 0.4228), which corresponded to the emission of relatively pure green light. Finally, the self--made LaGaO3:0.05Tb(3+) green phosphors along with commercially available red and blue phosphors were employed as the raw materials for assembling a LED device, which exhibited excellent white light emission performance.