Fluorescence Properties of Mn ions in Oxide Compounds

Abstract

Fluorescence properties of Mn ions in oxide compounds for red-emitting phosphors were investigated. The fluorescence spectrum of Mg₄Ta₂O₉ sample via excitation at 254 nm has a broad band centered at about 660 nm due to the ⁴T₁→⁶A₁ transition of Mn²⁺. The fluorescence spectrum of CaAl₁₂O₁₉ sample exhibits a narrow band between 600 - 750 nm with three peaks located at 643, 656, and 666 nm due to the ²E→⁴A₂ transition of Mn⁴⁺. The measured CIE chromaticity values of Mg₄Ta₂O₉: Mn²⁺ and CaAl₁₂O₁₉: Mn⁴⁺ samples are x=0.713, y=0.287 and x=0.714, y=0.276, respectively.