Synthesis and luminescence properties of pure nitride Ca-a-sialon with the composition Ca_(1.4)Al_(2.8)Si_(9.2)N_(16) by gas-pressed sintering

摘要

Pure nitride Ca-a-sialon phosphors with the composition Ca_(1.4)Al_(2.8)Si_(9.2)N_(16):xEu (x = 0-0.3) were successfully prepared by gas-pressed sintering and their luminescence properties and morphology were investigated. Simultaneously, their time-resolved spectra were also presented. Ca_(1.4)Al_(2.8)Si_(9.2)N_(16):Eu exhibited broad-band yellow-orange emission centered at ~592 nm (FWHM = 85 nm) under 400 nm excitation and with good thermal stability. Its emission intensity at 250 °C remained 88% of that measured at room temperature. The emission intensity was 1.7 times that of YAG:Ce~(3+) (P46-Y3) commercial phosphor. The outstanding luminescent properties allow it to be an attractive luminescent material for white LEDs.