Abstract
New red phosphors with nominal composition of Ca14(Al10-xMnx)Zn6O35 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 °C with increasing temperature, though the fluorescence intensity decreased.
