Journal
JOURNAL OF LUMINESCENCE
Volume 128, Issue 12, Pages 1922-1926Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2008.05.020
Keywords
Europium; Samarium; Potassium tungstate; Phosphor; Near ultra violet; LED; Flux; Rietveld; Sensitizer; Local environment
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Funding
- MOST
- POSTECH
- Samsung ElectroMechanics Co.
- BK21 program of the Ministry of Education, Republic of Korea
- National Research Foundation of Korea [과C6A2003, R01-2008-000-20905-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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