A. Zangvil—contributing editor
Reaction Mechanism of SrSi2O2N2:Eu2+ Phosphor Prepared by a Direct Silicon Nitridation Method
Article first published online: 1 SEP 2010
© 2010 The American Ceramic Society
Journal of the American Ceramic Society
Volume 94, Issue 1, pages 164–171, January 2011
How to Cite
Yang, X., Song, H., Yang, L. and Xu, X. (2011), Reaction Mechanism of SrSi2O2N2:Eu2+ Phosphor Prepared by a Direct Silicon Nitridation Method. Journal of the American Ceramic Society, 94: 164–171. doi: 10.1111/j.1551-2916.2010.04017.x
This work was supported by the National Natural Science Foundation of China (Grant No. 50702056), Chinese Academy of Sciences under Bairen Program and the Education Department of Anhui Province (TD200701, KJ2008A019).
- Issue published online: 5 JAN 2011
- Article first published online: 1 SEP 2010
- Manuscript No. 27338. Received January 6, 2010; approved June 28, 2010.
Highly efficient yellow–green-emitting SrSi2O2N2:0.02Eu2+ phosphor with a well-dispersed and uniform morphology was synthesized by a direct silicon nitridation method. The related synthesis parameters including soaking temperature, holding time, silicon source, gas species, and flow rate, have been studied, respectively, in terms of phase compositions and luminescent properties. The possible reaction mechanism was also proposed based on the results obtained. Silicon is assumed to be transported to the surface of decomposed SrO particles in the form of SiO or Si vapor, and nitridation reaction occurs here to form SrSi2O2N2:0.02Eu2+ phosphor directly. The particle size and morphology of phosphors obtained are controlled by the raw oxide materials instead of silicon. CO2 from the decomposition of SrCO3 plays an important role in the transportation of Si, which reacts with Si to form SiO vapor and introduces excessive oxygen into the phosphor obtained, resulting in an O/N ratio close to SrSi2O2N2. Direct silicon nitridation is proved to be a simple, cost-effective, facile, and potential morphology-controlling method to synthesize (oxo)nitridosilicate phosphors of excellent properties.