The crystal structure and luminescent properties of nitrogen-rich Ca-α-sialon：Eu with saturated calcium solubility fabricated by the alloy-nitridation method

• Published in: Chinese physics B 2012-07, Vol.21 (7), p.518-525
• Main Author: 杨建军 陈国动 杜飞飞 刘泉林
• Format: Article
• Language: English
• Subjects: Calcium; Calcium base alloys; Crystal structure; Luminescence; Optical properties; Phosphors; Quenching; sialon; Solubility; Wavelengths; 制备; 发光性能; 晶体结构; 欧盟; 氮化物; 钙合金; 饱和溶解度
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/21/7/077802

Nitrogen-rich Ca-α-sialon： Eu2＋ phosphors with saturated calcium solubility are synthesized through a solid- state reaction （SSR） at 2173 K with stable alloy and nitride as the starting materials. The Ca1.83-1.sxSi8.34 A13.66 Ox N16-x： xEu phosphors have intensive orange emissions, whose peaks are located at approximately 585 600 nm, and the emission wavelengths tend to shift toward the red region when the Eu concentrations increase from 0.5% to 18% （mole percentage）. When the Eu concentration is equal to 9%, the phosphors suffer from concentration quenching. The low-temperature photoluminescence properties indicate that Cal.aa-l.5xSi8.34Ala.66OzN16-x： xEu phosphors show ex- cellent thermal quenching. The crystal structures of Cal.83-1.5xSis.34A13.660xN16-x： xEu are also investigated, and are found to have nitrogen-rich compositions with saturated calcium cations at the interstitial sites of the α-sialons. In addition, tile influencing factors of α-sialons with different compositions on the crystal lattice are discussed in detail.