Photoluminescence property of ZnAl2O4: Mn chromatic pure green phosphors (特集光源・照明の新潮流)

概要

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We investigated the photoluminescence (PL) property of ZnAl2O4:Mn powder phosphors prepared by a solid phase method. The mixture of ZnO, α-Al2O3 and MnCl2 powders as sources were firing in the air at 1200 °C, followed by the thermal treatment in the reducing atmosphere at temperatures (Tr) from 800 to 1200 °C. The samples exhibited a highly chromatic pure green PL by exciting the ground state to the 4T2(4G) level in the Mn2+ luminescent center with a 450 nm light. The PL spectra, consisting of a narrow emission band with its peak at 511 nm, depended strongly on the synthesis conditions. The reducing treatment dramatically increased the PL intensity although the as-synthesized samples showed very week PL. The full width at half maximum of the emission band remained small with a value of about 21 nm for Tr up to 1000 °C although it tended to broaden for higher Tr, which was correlated well with the change in the PL excitation spectra. The PL properties are discussed in conjunction with the crystallographic property characterized by x-ray diffraction in terms of the use as a color converter in white-light-emitting diodes for backlight units.
社団法人電気学会の論文
2011-05-01