New Red Phosphors Ca₁₄Al₁₀Zn₆O₃₅ : Mn

Abstract

New red phosphors with nominal composition of Ca 14 (Al 10-x Mn x )Zn 6 O 35 were synthesized successfully. The composition x at which the highest fluorescent intensity was obtained was found to be 0.09. The manganese ions were determined to be tetravalent and six-coordinated in the samples by analyses of optical absorption spectra and fluorescence spectra. These samples emit red fluorescence without most changes in chromaticity up to 200 o C with increasing temperature, though the fluorescence intensity decreased.