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

78 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

Fingerprint

tungstates
Luminescence
Phosphors
phosphors
potassium
Potassium
Ions
luminescence
Electron transitions
Crystal structure
Crowns
Rietveld method
ions
crystal structure
electron transitions
energy absorption
Energy absorption
Solid state reactions
Electrons
Electron energy levels

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Gwan Hyoung ; Kim, Tae Hyung ; Yoon, Chulsoo ; Kang, Shinhoo. / Effect of local environment and Sm3+-codoping on the luminescence properties in the Eu3+-doped potassium tungstate phosphor for white LEDS. In: Journal of Luminescence. 2008 ; Vol. 128, No. 12. pp. 1922-1926.
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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 5D0→7F2 transition of the Eu3+ ions, resulting in more emission peaks. Crown",
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Effect of local environment and Sm3+-codoping on the luminescence properties in the Eu3+-doped potassium tungstate phosphor for white LEDS. / Lee, Gwan Hyoung; Kim, Tae Hyung; Yoon, Chulsoo; Kang, Shinhoo.

In: Journal of Luminescence, Vol. 128, No. 12, 01.12.2008, p. 1922-1926.

Research output: Contribution to journalArticle

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AU - Lee, Gwan Hyoung

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AU - Kang, Shinhoo

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N2 - 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 5D0→7F2 transition of the Eu3+ ions, resulting in more emission peaks. Crown

AB - 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 5D0→7F2 transition of the Eu3+ ions, resulting in more emission peaks. Crown

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