Combustion synthesis and luminescent properties of metal yttrium borates M_3Y_2 (BO_3)_4:Eu~(3+) (M = Ba, Sr) for PDPs applications

摘要

The polycrystalline powder samples of Eu~(3+) activated; mixed metal yttrium borate phosphors M_3Y_2(BO_3)_4 (M = Ba, Sr) with improved color purity of red emission for plasma display panels (PDPs) were prepared by solution combustion technique. The synthesis is based up on the exothermic reaction between the fuel (Urea) and oxidizer (Ammonium nitrate) .The heat generated in the reaction is utilized for auto combustion of ingredients. The formation of desired product and crystal structure was confirmed by powder XRD technique; while particle morphology was studied using FE-SEM. Samples under 254 and 147 nm excitation showed intense and pure red emission around 613 nm corresponding to the electric dipole ~5Dn -> ~7F_2 transition of Eu~(3+), CIE chromaticity coordinates of synthesized phosphors was found to be (x = 0.67, y = 0.32) close to National Television Standard Committee (NTSC) for red color; found suitable to employ in plasma display panels (PDPs) applications.