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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

Cited 87 time in Web of Science Cited 96 time in Scopus

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

Issue Date
Elsevier BV
Journal of Luminescence, Vol.128 No.12, pp.1922-1926
The luminescence properties of Eu3+ and Sm3+-doped potassium tungstate phosphors were investigated. The K4-3(x+y) (WO4)(2):Eu3+,Sm-y(3+) 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 D-5(0) -> F-7(2) transition of the Eu3+ ions, resulting in more emission peaks. Crown Copyright (c) 2008 Published by Elsevier B.V. All rights reserved.
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  • College of Engineering
  • Department of Materials Science & Engineering
Research Area 2D materials, 2차원 물질, Smiconductor process, semiconductor devices, 반도체 공정, 반도체 소자


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