酸化物系化合物にドープしたMn^<2+>の赤色蛍光特性に及ぼすマトリクス効果

概要

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Red fluorescent properties of Mn2+ in oxide compounds were investigated in order to improve the chromaticity of red emitting-phosphors. Mg4Ta2O9 and Mg4Nb2O9 with corundum-type structure were selected for the matrix of Mn2+ based on the ionic radius and oxygen coordination number of Mn2+ site. Mg4Ta2O9 : Mn2+ with excitation of 254 nm shows a red fluorescence centered at 660 nm due to the 4T1→6A1 transition of Mn2+. On the other hand, Mn ions in Mg4Nb2O9 do not show any fluorescence. The measured CIE chromaticity value of the red fluorescence of Mg4Ta2O9 : Mn2+ is x = 0.713, y = 0.287; therefore the chromaticity of red fluorescence of Mg4Ta2O9 : Mn2+ is better than that of commercially available Y2O3 : Eu3+ with x = 0.630, y = 0.365. However, the red fluorescence intensity of Mg4Ta2O9 : Mn2+ is about one-third that of Y2O3 : Eu3+. The compositional dependence of fluorescent properties of Mn ions in Mg4Ta2O9 and Mg4Nb2O9 with corundum-type structure was discussed in terms of stability of crystal structure. The relationship between the preparation conditions and the red fluorescence intensity of Mg4Ta2O9 : Mn2+ was also discussed based on the redox of Mn ions.
社団法人資源・素材学会の論文
2003-12-25