SCHEDULED MAINTENANCE
Co-precipitation synthesis, photoluminescence properties and theoretical calculations of MgWO4:Eu3+ phosphors
Abstract
A novel red light emitting phosphorescent material MgWO4:Eu3+ is successfully synthesized by the co-precipitation method. The structure, luminescent properties and fluorescence lifetime of the prepared phosphors are characterized using X-ray diffraction (XRD), photoluminescence and luminescence decay spectra. The results indicate that an effective electric dipole transition 5D0–7F2 of Eu3+ red emission with maxima at 615 nm can be achieved in the MgWO4 host while being excited by near-UV light (393 nm) or blue light (464 nm). The CIE chromaticity coordinates of MgWO4:Eu3+ phosphors exhibit emission in the red-light region. Moreover, to explain the fluorescence spectra of MgWO4:Eu3+ phosphors, a complete energy matrix is successfully built by an effective operator Hamiltonian including free ion and crystal field interactions. The fluorescence spectra for the Eu3+ ion at the monoclinic (C2v) Mg2+ site of the MgWO4 crystal are calculated from this matrix. The fitting values are in agreement with the observed results.
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