Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403605 | Journal of Luminescence | 2008 | 5 Pages |
Abstract
The luminescence properties of Eu3+- and Sm3+-doped potassium tungstate phosphors were investigated. The K4â3(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 405Â 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 5D0â7F2 transition of the Eu3+ ions, resulting in more emission peaks.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Gwan-Hyoung Lee, Tae-Hyung Kim, Chulsoo Yoon, Shinhoo Kang,