Enhanced red emission in Sr(1-x)EuxMo0.5W0.5O4 (x = 0.01, 0.02, 0.04) phosphor and spectroscopic analysis for display applications
Abstract: 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 5D0 → 7F2 transition of Eu3+ (623 nm). The Sr(1-x)EuxMo0.5W0.5O4 samples showed high color purity (≈ 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.
Author(s): Lovisa, L. X.; Dos Santos, D. F.; Santiago, A. A. G.; Li, M. S.; Longo, E.; Motta, F. V.; Bomio, M. R. D.
Journal of Materials Science
Published: 27 April 2022
DOI: https://doi.org/10.1007/s10853-022-07203-x
CDMF
The CDMF, hosted at the Federal University of São Carlos (UFSCar), is one of the Research, Innovation and Dissemination Centers (RIDC) supported by the São Paulo State Research Support Foundation (Fapesp), and also receives investment from the National Council Scientific and Technological Development (CNPq), from the National Institute of Science and Technology of Materials in Nanotechnology (INCTMN).
