Enhanced red emission in Sr(1-x)EuxMo0.5W0.5O4 (x=0.01, 0.02, 0.04) phosphor and spectroscopic analysis for display applications

摘要

The particles of the solid solution of strontium molybdate and tungstate (SrMo0.5W0.5O4) were doped with Eu3+ ions at concentrations of 1, 2 and 4 mol synthesized by the microwave-hydrothermal method (MHM). The structural analyses of the particles were conducted by XRD with Rietveld Refinement and FT-Raman spectroscopy. The crystallization and growth of particles were investigated by FEG-SEM and proposed a mechanism of particle development involving the steps: nucleation and further growth. The SrMo0.5W0.5O4 presented white emission with the chromaticity coordinates: (0.32; 0.40). The Sr(1-x)EuxMo0.5W0.5O4 samples exhibited an increase in luminescence intensity in the red region as the concentration of Eu3+ increases, a behavior attributed to the D-5(0) -> F-7(2) transition of Eu3+ (623 nm). The Sr(1-x)EuxMo0.5W0.5O4 samples showed high color purity (approximate to 97), as well as the results of the color reproduction index (CRI) reached 80 level. The radiation luminous efficiency (LER) presented by the samples exhibited values of 322 lm.W-1. According to the quality of the photometric parameters presented, the samples have attributions for application in solid-state lighting devices. GRAPHICS .