Synthetic Method and Luminescence Properties of Sr[sub x]Ca[sub 1−x]AlSiN[sub 3]:Eu[sup 2+] Mixed Nitride Phosphors

Abstract

Single-phase -doped red phosphor was obtained by nitridation of alloy powder under the high pressure of in a hot isostatic pressing apparatus at . The unit cell volumes of the single phase expanded linearly with the increase in value of from 0.2 to 0.8. A blueshift of the red emission peak of from 650 to was observed by weakening the crystal field strength around the ion. , with the optimum Eu concentration, showed high photoluminescence intensity over the whole range of value from 0.2 to 0.8. Unlike nitrides of alkaline-earth or rare-earth metals, the intermetallic alloy powder was stable under ambient conditions and was thus suitable as starting material for red phosphors for industrial production. In samples synthesized at , the same structure as , space group 36 , was retained at unit cell volumes up to , exhibiting the maximum solubility of in the solid solution, .