Abstract: The synthesis of(La,Ce,Tb)PO₄ by means of microwave heating is reported. The analysis of X-ray powder diffraction data shows that the phosphor belongs to the mono-clinic system with the structure of monazite.The phosphor has the maximum excitation peak at λ_ex=273.5 nm and maximum emission peak at λ_em=543 nm,the latter being the characteristic emission of Tb³⁺ion.The effects of different flux and (NH₄)₂HPO₄ dosage on the luminescence intensity are examined and the chromatic coordinates and related chromatic temperature are measured.

Key words: microwave heating effect, synthesis, phosphor, cerium and terbium activated lan thanum phosphate