Photoluminescences analysis of CMC-SrAl₂O₄:Eu³⁺ nanoparticles at different excitation wavelengths

Abstract

Photoluminescence characteristics of Sodium Carboxyl Methyl Cellulose (CMC) capped Europium doped Strontium Aluminate nanoparticles at 1000OC using direct chemical combustion techniques is reported. The impact of CMC (-CH₂-COOH) as a capping agent on the optical, structural morphology and photoluminescence properties of SrAl₂O₄:Eu³⁺ at different excitation wavelength revealed that the obtained structures were monoclinic with the crystal sizes of 39.35nm, and 37.72nm; energy band gap were 4.94eV and 5.02eV for the uncapped and capped phosphor respectively. The Scanning Electron Micrograph shows that the particles were agglomerated and well passivized; Photoluminescence emission broad band was observed with the capped phosphor between 626nm-697nm and uncapped phosphor between 611nm-690nm and visible peak at 694nm (Orange – Red colour). The intensity of the capped phosphor was found to be lower causing luminescence degradation.