Ammonothermal synthesis of charge-compensated SrAlSiN₃:Ce³⁺ phosphor

抄録

In this study, we successfully synthesized SrAlSiN₃:Ce³⁺ at 1073 K using the ammonothermal method. Scanning electron microscope images revealed bar-like crystals in the products. We investigated the effects of using a charge-compensating ion on the phosphor’s emission of SrAlSiN₃ with Ce³⁺ and Sr²⁺ and adding Na⁺ as a charge compensator. We found that Ce³⁺-doped SrAlSiN₃ exhibited a weak emission. However, SrAlSiN₃ co-doped with Ce³⁺ and Na⁺ exhibited a broad emission band centered at approximately 550 nm for an excitation wavelength of 460 nm. We, thus, found that Na⁺ has an important impact on Sr²⁺ and Ce³⁺ by acting as a charge-compensating ion. We were able to successfully synthesize a novel SrAlSiN₃:Ce³⁺ phosphor by adjusting the charge of Sr²⁺ and Ce³⁺ by controlling the Na⁺ co-doping.