Photoluminescence and Raman scattering spectroscopies of BaSiF6:Mn4+ red phosphor

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250

作者：

D Sekiguchi，JI Nara，S Adachi

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摘要：

We report on a simple method of synthesizing BaSiF6:Mn4+red phosphor by chemical reaction of BaCl2·2H2O in a H2SiF6solution. The Mn4+-activated BaSiF6phosphor exhibits sharp red emission peaks at 630nm. The optical properties of BaSiF6:Mn4+are investigated using photoluminescence (PL) analysis, PL excitation spectroscopy, luminescence decay time measurement, and Raman scattering spectroscopy. The zero-phonon line (ZPL) emission and excitation peaks in BaSiF6:Mn4+are observed to occur at 1.99eV (2E→4A2), 2.43eV (4A2→4T2), and 2.86eV (4A2→4T1) at 300K. The ZPL and phonon-assisted emission peaks show clear splittings with energy of 3meV being due to the trigonal distortion of the MnF62octahedron in the BaSiF6host. A single exponential decay time of 6.5ms is observed, which is indicative of the forbidden character of the intra-d-shell transitions in Mn4+ions. Temperature dependence of the PL intensity is also measured betweenT=20 and 300K with steps of 10K and interpreted by taking into consideration the BoseEinstein phonon statistics together with the thermal quenching process.

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关键词：

barium compounds Bose-Einstein condensation crystal growth from solution manganese phonon spectra phosphors photoluminescence quenching (thermal Raman spectra silicon compounds Other solid inorganic materials