Preparation of LaPO<sub>4</sub> with Different Morphologies and Fluorescence Properties by Sol-Gel Spin-Coating Method
Lanthanum Phosphate (LaPO 4 ) nanostructures thin films have been successfully synthesized by sol-gel spin coating technique from lanthanum nitrate and ammonium phosphate in ammonia solution. The procedure starting with formation of homogenous and transparent solution followed with annealing to form the LaPO 4 nanostructures thin films. The films were annealed at different temperature to study its effect to the surface morphology and optical properties of the films. The phosphate particles are having near-spherical to rod-like nanostructures with an average size about 15 nm. The morphology is retained even the annealing temperature is increased. Furthermore, photoluminescence (PL) characterization of LaPO 4 also was reported. The effect of annealing temperature was discussing detail. The intensity as well as optical brightness is highly dependent on anneal temperature. Fourier transform infra red spectra of films obtained are similar to the previous synthesis of phosphate. Thus, confirmed the formation of LaPO 4 on the glass substrate.