A Novel Warm Red-Emission of SrLa0.9Eu0.1AlO4 Phosphor obtained by Combustion Method.

Abstract

In this study, A novel warm redemitting phosphor Strontium Lanthanum Aluminate (SrLaAlO 4 :xEu ) doped with the trivalent Europium ions were synthesized via urea-based solution combustion method. The x mol% doping concentration of Eu 3+ was varied in x = 0.0, and 0.01 mol%. X-ray diffraction analysis show that all samples exhibit the reflected peaks of the tetragonal structure SrLaAlO 4 matching with the JCPDS No 24-1125 standard card. The SEM analysis show irregular grains for all samples with mean sizes which reduces from 0.996 to 0.909 µm. The optical band gap of 4.47 eV and refractive of 1.79 were obtained from the Tauc plots from the absorbance spectra. Photoluminescence spectra of the SrLaAlO 4 : 0.10Eu, under 279 nm excitation, show a very intense red emission peak band centered at 622 nm due to the 5 D 0 -7 F 2 transition of Eu 3+ . The CIE chromaticity color coordinates were calculated and found to have a color purity and CCT with 53.1 % and 2057 K respectively. All the results clearly indicate that Eu-doped SrLaAlO 4 phosphors can be used as a red color component for solid state lighting devices, especially for the fabrication of near-UV based white LEDs, bio-imaging, and labeling.