Structural, spectroscopic and photoluminescence studies of LiEu(WO{sub 4}){sub 2-} {sub x} (MoO{sub 4}) {sub x} as a near-UV convertible phosphor

Journal Article · Thu Feb 15 04:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.11.015· OSTI ID:21015692

Chiu, C -H ^[1]; Wang, M -F ^[2]; Lee, C -S ^[2]

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1. Phosphors Research Laboratory, Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan (China)
2. Applied Inorganic Solid-State Laboratory, Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan (China)

A series of lithium europium double tungsto-molybdate phosphors LiEu(WO{sub 4}){sub 2-} {sub x} (MoO{sub 4}) {sub 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 {sup 5} D {sub 0}{sup {yields}}{sup 7} F {sub 2} emission of Eu{sup 3+} 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 {sup 5} D {sub 0}{sup {yields}}{sup 7} F {sub 2} 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(WO{sub 4}){sub 2-} {sub x} (MoO{sub 4}) {sub x} is investigated and discussed. - Graphical abstract: As shown by the PL spectra of LiEu(WO{sub 4}){sub 2-} {sub x} (MoO{sub 4}) {sub x} (x=0, 0.4, 0.8, 1.2, 1.6, 2.0) under 394 nm near-UV excitation, the intensity of {sup 5} D {sub 0}{sup {yields}}{sup 7} F {sub 2} transition was found to increase with the increasing x and the I-{lambda} curve reaches a maximum when the relative ratio of Mo/W is 2:0.

• OSTI ID: 21015692
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CHEMICAL COMPOSITION
CRYSTAL FIELD
CRYSTAL STRUCTURE
EUROPIUM COMPOUNDS
EUROPIUM IONS
EXCITATION
LITHIUM COMPOUNDS
MOLYBDATES
PHOSPHORS
PHOTOLUMINESCENCE
TUNGSTATES