Formation of Sr2Si5N8:Eu2+ and Its Transformation to SrSi6N8:Eu2+ Controlled by Temperature and Gas Pressure

Shin Mou Wu, Hao En Hung, Chi Hsing Hsieh, Yin Chih Lin, Li Chun Wang, Yi Ting Tsai, Chun Che Lin, Ru Shi Liu

Research output: Contribution to journalArticle

Abstract

Firing temperature and gas pressure effect of synthesizing Sr2Si5N8:Eu2+ were investigated. The emission intensity is positively correlated with the firing temperature under 0.1 and 0.5 MPa gas pressure. The Sr2Si5N8:Eu2+ with the highest emission intensity was found at 1700°C and 1980°C under 0.1 and 0.5 MPa gas pressure, respectively. Although the maximum emission intensity of Sr2Si5N8:Eu2+ obtained under 0.5 MPa gas pressure condition is higher than that under 0.1 MPa. The Sr2Si5N8:Eu2+ synthesized under 0.5 MPa gas pressure in the temperature range from 1600°C to 1800°C have lower emission intensities than that synthesized under 0.1 MPa indicating that the melting of Sr3N2 is an important step for the formation of Sr2Si5N8:Eu2+. Moreover, the Sr2Si5N8:Eu2+ undergoes phase transition into SrSi6N8:Eu2+ completely after elongating the heating duration to 6 h at 1980°C under 0.5 MPa gas pressure. The same feature was observed under 0.1 MPa gas pressure after firing 8 h at 1750°C. Different heating durations led to different degrees of phase transition.

Original languageEnglish
Pages (from-to)2662-2669
Number of pages8
JournalJournal of the American Ceramic Society
Volume98
Issue number8
DOIs
Publication statusPublished - Aug 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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