Host-sensitized emission of LiInW{sub 2}O{sub 8} wolframites: From red-Eu{sup 3+} to white-Dy{sup 3+} phosphors

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.07.029· OSTI ID:21580237

Asiri Naidu, S ^[1]; Boudin, S ^[1]; Varadaraju, U V ^[2]; Raveau, B ^[1]

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1. Laboratoire CRISMAT (CNRS UMR6508), ENSICAEN, Universite de Caen, 6 Bd. Marechal Juin, 14050 Caen Cedex (France)
2. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036 (India)

The LiInW{sub 2}O{sub 8}:Eu{sup 3+}, LiInW{sub 2}O{sub 8}:Dy{sup 3+} and LiInW{sub 2}O{sub 8}:Eu{sup 3+}/Dy{sup 3+} phosphors were synthesized by solid-state reaction and their photoluminescence properties were studied. Under UV excitation, the LiInW{sub 2}O{sub 8}:Eu{sup 3+} phosphor exhibits an intense red emission whereas the LiInW{sub 2}O{sub 8}:Dy{sup 3+} and LiInW{sub 2}O{sub 8}:Dy{sup 3+}/Eu{sup 3+} phosphors show a white emission. The WO{sub 6} octahedra play a major role in the luminescence of the host lattice, characterized by a blue emission under UV excitation. The emission of activator ion results from an efficient energy transfer from the LiInW{sub 2}O{sub 8} host lattice to the Eu{sup 3+} and Dy{sup 3+} ions. The LiIn{sub 0.97}Dy{sup 3+}{sub 0.03}W{sub 2}O{sub 8} and LiIn{sub 0.965} Dy{sup 3+}{sub 0.03}Eu{sup 3+}{sub 0.005}W{sub 2}O{sub 8} samples, optimized for white emission, are interesting candidates for solid-state lighting applications. - Graphical abstract: LiInW{sub 2}O{sub 8}:Eu{sup 3+}, Dy{sup 3+}/Eu{sup 3+} emits red and white colors, respectively, under host excitation wavelength. An effective energy transfer from LiInW{sub 2}O{sub 8} to Eu{sup 3+} and Dy{sup 3+} ions is occurred. Eu{sup 3+} and Dy{sup 3+} occupy non-centrosymmetric sites in the host lattice. Highlights: > Photoluminescence of LiInW{sub 2}O{sub 8}:Eu{sup 3+}, Dy{sup 3+}/Eu{sup 3+} was analyzed under UV excitation at room temperature. > WO{sub 6} octahedra play a major role in the host lattice luminescence. > Eu{sup 3+} and Dy{sup 3+} ions can be excited directly through host lattice.

• OSTI ID: 21580237
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 9 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHARGED PARTICLES
DYSPROSIUM IONS
EMISSION
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EUROPIUM IONS
EXCITATION
IONS
LUMINESCENCE
MINERALS
OXIDE MINERALS
PHOSPHORS
PHOTOLUMINESCENCE
PHOTON EMISSION
SOLIDS
WOLFRAMITE