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- W2020194756 abstract "This paper reports on a study of the photoluminescence excitation (PLE) spectra of Mn 4+ -activated K 2 SiF 6 phosphor at 20 and 300 K. Measurements of the PLE spectra show that the sharp red emissions ( 2 E g → 4 A 2g ) at ∼630 nm are most efficiently excited by irradiation into the spin-allowed transitions 4 A 2g → 4 T 2g (∼460 nm) and 4 A 2g → 4 T 1g (∼360 nm). The first efficient excitation band 4 A 2g → 4 T 2g is structureless at 300 K but shows a sharp origin and some oscillatory peaks at 20 K. A Fourier transform technique is used for analyzing such oscillatory peaks. The second excitation band 4 A 2g → 4 T 1g shows a structureless shape even at a low temperature (20 K). The third excitation band with a peak at ∼250 nm is very weak and could be assigned as the 4 A 2g → 4 T 1g transition. The direct excitation of the 2 E g state is also found to produce the sharp red emissions at ∼630 nm with a negligibly small offset in the configurational coordination. The Franck–Condon analysis makes it possible to accurately determine the zero-phonon line energies in the 3d 3 electron transitions of the MnF 6 2- octahedron." @default.
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- W2020194756 date "2011-09-01" @default.
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- W2020194756 title "Excited States of 3d<sup>3</sup> Electrons in K<sub>2</sub>SiF<sub>6</sub>:Mn<sup>4+</sup> Red Phosphor Studied by Photoluminescence Excitation Spectroscopy" @default.
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- W2020194756 doi "https://doi.org/10.1143/jjap.50.092401" @default.
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