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Chin. Phys. B, 2012, Vol. 21(7): 077802    DOI: 10.1088/1674-1056/21/7/077802
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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

Yang Jian-Jun(杨建军), Chen Guo-Dong(陈国动), Du Fei-Fei(杜飞飞), and Liu Quan-Lin(刘泉林)
School of Materials Science & Engineering and State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Abstract  Nitrogen-rich Ca- -sialon: Eu2+ phosphors with saturated calcium solubility are synthesized through a solidstate reaction (SSR) at 2173 K with stable alloy and nitride as the starting materials. The Ca1.83-1.5xSi8.34 Al3.66OxN16-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 Ca1.83-1.5xSi8.34Al3.66OxN16-x: xEu phosphors show excellent thermal quenching. The crystal structures of Ca1.83-1.5xSi8.34Al3.66OOxN16-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, the influencing factors of -sialons with different compositions on the crystal lattice are discussed in detail.
Keywords:  Ca-α-sialon      crystal structure      luminescence      alloy-nitridation  
Received:  24 November 2011      Revised:  15 December 2011      Accepted manuscript online: 
PACS:  78.55.Hx (Other solid inorganic materials)  
  81.05.Je (Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))  
  61.66.Fn (Inorganic compounds)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 90922027), the National High Technology Research and Development Program of China (Grant No. 2009AA03Z432), and the Doctoral Fund of Ministry of China (Grant No. 20100006110011).
Corresponding Authors:  Liu Quan-Lin     E-mail:  qlliu@ustb.edu.cn

Cite this article: 

Yang Jian-Jun(杨建军), Chen Guo-Dong(陈国动), Du Fei-Fei(杜飞飞), and Liu Quan-Lin(刘泉林) The crystal structure and luminescent properties of nitrogen-rich Ca-α-sialon:Eu with saturated calcium solubility fabricated by the alloy-nitridation method 2012 Chin. Phys. B 21 077802

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