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Luminescence properties of the Ca-alpha-sialon:Eu solid solution

机译：Ca-alpha-sialon：Eu固溶体的发光性质

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The Ca,Eu-alpha-sialon powders with the mixed solid solution composition have been manufactured via the solid-state reaction process in flowing nitrogen in a graphite furnace at a relatively low temperature of 1650 degrees C without an external overpressure. XRD data with Rielveld refinement and XPS measurements were used for characterization of the lattice constants and the surface chemical composition. The mono phase Ca-Eu-alpha-sialon was obtained with the nominal composition of Et0.048Ca0.702Si7.75Al2.25O0.75N15.25. The highest emission intensity in a yellow-orange region at 590 nm and quantum efficiency of 66% was found for this pure Ca,Eu-alpha-sialon. Estimation of m,n values from the lattice constant and EDS results showed a small deviation from the nominal composition of designed alpha-sialon. XPS results demonstrated significant changes of the chemical composition in the oxidized surface of phosphor particles. Possible reasons of emission redshift and relationship between the actual solid solution composition and luminescence properties are discussed in terms of simultaneous presence of Eu2+ and Eu3+ ions in the sialon crystal lattice and residual oxynitride glass. (C) 2016 Elsevier B.V. All rights reserved.
机译：具有混合的固溶体组合物的Ca，Eu-α-赛隆粉末已经通过固相反应过程在1650℃的相对低的温度下在石墨炉中在氮气流中流动而没有外部超压的条件下制造。使用Rielveld精修和XPS测量的XRD数据用于表征晶格常数和表面化学成分。获得具有Et0.048Ca0.702Si7.75Al2.25O0.75N15.25的标称组成的单相Ca-Eu-α-赛隆。对于这种纯Ca，Eu-alpha-sialon，发现在590 nm的橙黄色区域中的最高发射强度和66％的量子效率。从晶格常数和EDS结果估计的m，n值显示与设计的alpha-sialon的标称成分有很小的偏差。 XPS结果表明，磷光体颗粒氧化表面的化学成分发生了显着变化。根据在赛隆晶格和残余氮氧化物玻璃中同时存在Eu2 +和Eu3 +离子的问题，讨论了发射红移的可能原因以及实际固溶体成分与发光性能之间的关系。 （C）2016 Elsevier B.V.保留所有权利。

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