Microstructure and luminescent properties of Eu2W 2O9 phosphors

Kyung Hoon Cho, Kyoung Pyo Hong, Sahn Nahm, Bo Yun Jang, Joo Seok Park, Soon Jae Yoo

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A homogeneous Eu2W2O9 phase with small grains (∼4.0μm) was formed for the specimens fired below 1175°C. As the firing temperature was increased above 1150°C, grain growth occurred and the grain shape changed from faceted to round. The excitation spectra of the Eu2W2O9 phosphor were similar to those of the Eu2(WO4)3 phosphor, but the absorption band due to the O2-→W6+ ligand to metal charge transfer was shifted to lower energies and the 7Fo5H3 and 7Fo5F 2,4 transitions were not found. The intensity of the excitation and emission spectra of the Eu2W2O9 phosphor considerably increased with increasing firing temperature, due to the increased grain size and changed grain shape. The intensity of the red emission band of the Eu2W2O9 phosphor was higher than that of the Eu2(WO4)3 phosphor. Moreover, the addition of LiCl to the Eu2W2O9 phosphors considerably enhanced the intensity of their emission spectra, probably due to the increased grain size. Therefore, LiCl-added, Eu2W2O9 phosphor is a promising candidate material for red color emission.

Original languageEnglish
Pages (from-to)98-104
Number of pages7
JournalJournal of Electroceramics
Volume22
Issue number1-3
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • EuWO
  • Microstructure
  • Photo-luminescence
  • Red phosphor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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