properties of fine yellow-orange Ca-α-SiAlON Eu2+ phosphors.pdf

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properties of fine yellow-orange Ca-α-SiAlON Eu2+ phosphors.pdf

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propertiesoffineyellow-orangeCa-α-SiAlONEu2phosphors

Journal of Alloys and Compounds 541 (2012) 70–74Contents lists available at SciVerse ScienceDirect Journal of Alloys and Compounds journal homepage: www.elsevier .com/locate / ja lcomSynthesis, structure and photoluminescence properties of fine yellow-orange Ca-a-SiAlON: Eu2+ phosphors Zhigang Yang, Yuhua Wang ?, Zhengyan Zhao Department of Material Science, School of Physics Science and Technology, Lanzhou University, Lanzhou 730000, China a r t i c l e i n f oArticle history: Received 13 March 2012 Received in revised form 20 June 2012 Accepted 20 June 2012 Available online 28 June 2012 Keywords: Phosphor Ca-a-SiAlON White LEDs Luminescence0925-8388/$ - see front matter 2012 Elsevier B.V. A /10.1016/j.jallcom.2012.06.107 ? Corresponding author. Tel.: +86 931 8912772; fax E-mail address: wyh@ (Y. Wang).a b s t r a c t Yellow-orange oxynitride Ca-a-SiAlON: Eu2+ phosphors with the compositions of Ca0.8Si9.2Al2.8O1.2N14.8: xEu2+ (x = 0–0.24) were obtained via carbothermal reduction and nitridation method. Crystallographic parameters of the refinement structure with triclinic space group P31c (159) were obtained by XRD refinement as a = b = 7.8859(3) ?, c = 5.7336(2) ?, V = 308.7915(3) ?3, Z = 1. The resulting phosphors can absorb light in the range of 300–500 nm efficiently and show a single intense broad emission band in the wavelength range of 500–700 nm with maximum intensity at 580–601 nm. The chromaticity coor- dinates of the synthesized Ca-a-SiAlON: Eu2+ phosphors can be tailored by simply controlling the activa- tor concentration. All the results show that Ca-a-SiAlON: Eu2+ phosphors can be a candidate for warm white LEDs. 2012 Elsevier B.V. All rights reserved.1. Introduction bonds [24]. Especially, the Eu2+ activated Ca-a-SiAlON is an excel-White light-emitting diodes (w-LEDs) have attracted increasing attention as a light source for the next-generation general illumina- tion owing to their reliability, high efficiency, and low energy con- sumption [1,2].