R.P. Sonekar

Combustion Synthesis and VUV Photoluminescence Studies of Borate Host Phosphors YBO3:RE3+ (RE = Eu3+, Tb3+) for PDPs Applications

The inorganic borate host phosphors YBO3:RE ion (RE = Eu3+,Tb3+) were synthesized by a novel solution combustion technique. The synthesis is based on the exothermic reaction between fuel (urea) and oxidizer (ammonium nitrate). The heat generated in the reaction was used for auto combustion of precursors. The photoluminescence properties and spectroscopic investigation of the phosphor powder samples were investigated under ultraviolet (UV) and vacuum ultraviolet (VUV) excitation. The phosphors YBO3:Eu3+ and YBO3:Tb3+ show strong absorption in the UV and VUV region and exhibit intense orange-red and green emission, respectively, when excited by 254 nm UV and 147 nm VUV radiation. The phosphor YBO3 doped with Eu3+ and Tb3+ could be an efficient VUV-excited phosphor for plasma display phosphors (PDP) applications.

Photoluminescence Properties of Combustion Synthesized BaB2O4:Pb2+ Phosphor

Inorganic borate host phosphor BaB2O4 doped with varying concentrations of Pb2+ has been prepared by a solution combustion synthesis technique. The synthesis is based on the exothermic reaction between the fuel (urea) and oxidizer (ammonium nitrate). The photoluminescence properties of prepared materials were studied at room temperature. Under the excitation of 240 nm, the phosphor BaB2O4:Pb2+ shows broad emission at 370 nm (corresponds to 3P1 to 1S0 transition). The optimum concentration of Pb2+ in BaB2O4:Pb2+ was found to be 0.02 mol (relative to Ba). The critical transfer distances, R0 were calculated. Stokes shifts were calculated (using corresponding excitation and emission band peaks) to be 14,640 cm−1. The emission bands of synthesized phosphors are in the ultraviolet (UV) region and could be potential candidates for application in UV lamps.