Effect of local environment and Sm3+-codoping on the luminescence properties in the Eu3+-doped potassium tungstate phosphor for white LEDS

Gwan Hyoung Lee, Tae Hyung Kim, Chulsoo Yoon, Shinhoo Kang

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

The luminescence properties of Eu3+- and Sm3+-doped potassium tungstate phosphors were investigated. The K4-3(x+y) (WO4)2:Eux3+,Smy3+ phosphor was produced by solid-state reactions, followed by re-firing with a flux. The phosphor showed a strong absorption in the near-UV to green region due to 4f-4f electron transitions of the Eu3+ and Sm3+ ions, generating a red emission. The excitation spectrum could be adjusted by Sm3+-codoping. A small amount of Sm3+, acting as a sensitizer, increased the energy absorption peak at 405 nm. The crystal structure and local environment around the Eu3+ ions were determined using the Rietveld method. The crystal structure of this phosphor was determined to be monoclinic with a space group of C2/c. The small Eu-0 distance in the crystal led to high energy-level splitting at the 5D07F2 transition of the Eu3+ ions, resulting in more emission peaks. Crown

Original languageEnglish
Pages (from-to)1922-1926
Number of pages5
JournalJournal of Luminescence
Volume128
Issue number12
DOIs
Publication statusPublished - 2008 Dec 1

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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