Structural, spectroscopic and photoluminescence studies of LiEu(WO4)2-x(MoO4)x as a near-UV convertible phosphor

Chuang Hung Chiu, Ming Fang Wang, Chi-Shen Lee, Teng-Ming Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

148 Scopus citations

Abstract

A series of lithium europium double tungsto-molybdate phosphors LiEu(WO4)2-x(MoO4)x (x=0, 0.4, 0.8, 1.2, 1.6, 2.0) have been synthesized by solid-state reactions and their crystal structure, optical and luminescent properties were studied. As the molybdate content increases, the intensity of the 5D07F2 emission of Eu3+ activated at wavelength of 396 nm was found to increase and reach a maximum when the relative ratio of Mo/W is 2:0. These changes were found to be accompanied with the changes in the spectral feature, which can be attributed to the crystal field splitting of the 5D07F2 transition. As the molybdate content increases the emission intensity of the 615 nm peak also increases. The intense red-emission of the tungstomolybdate phosphors under near-UV excitation suggests them to be potential candidate for white light generation by using near-UV LEDs. In this study the effect of chemical compositions and crystal structure on the photoluminescent properties of LiEu(WO4)2-x(MoO4)x is investigated and discussed.

Original languageEnglish
Pages (from-to)619-627
Number of pages9
JournalJournal of Solid State Chemistry
Volume180
Issue number2
DOIs
StatePublished - 1 Feb 2007

Keywords

  • LED
  • LiEu(WO)(MoO)
  • Phosphors
  • Photoluminescence

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