Synthesis and Materials Design for Heteroanion Compounds

Oxynitride phosphors, SrSi2O2N2:Eu2+ were synthesized through a conventional solid state reaction between Sr2SiO4:Eu2+ precursor and Si3N4 by using NH4Cl flux, and their luminescence properties were characterized from a viewpoint of the ionic and covalent bond natures as the "heteroanion compou...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 18; no. 5; pp. 052001 - 4
Main Author Machida, K
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.02.2011
Subjects
Ammonium chloride
Anions
Bonding strength
Chemical bonds
Covalence
Covalent bonds
Europium
Illumination
Lattice vibration
Luminescence
Materials science
Optical properties
Phosphors
Polyelectrolytes
Precursors
Silicon dioxide
Silicon nitride
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Summary:Oxynitride phosphors, SrSi2O2N2:Eu2+ were synthesized through a conventional solid state reaction between Sr2SiO4:Eu2+ precursor and Si3N4 by using NH4Cl flux, and their luminescence properties were characterized from a viewpoint of the ionic and covalent bond natures as the "heteroanion compound" containing O2− and N3− anions. The structural framework of host lattice is constructed by covalently bonded layers of SiON3 units, suggesting that the rearrangement of O2− and N3− anions effectively takes place between isolated SiO44−anions of the Sr2SiO4:Eu2+ precursor and SiN4 units of the Si3N4 raw material. Furthermore, the layered structure consisting of (Si2O2N2)n2n− polyanions as tightly connected by Si-N-Si covalent bonds depresses the lattice vibration of Sr(Eu)-O or Si-O bond, so that the temperature quenching effect is lowered to give the intense emission for LED-based illumination lamps.
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ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/18/5/052001