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 00:00:00 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, Vol. 184, Issue 9; Other Information: DOI: 10.1016/j.jssc.2011.07.029; PII: S0022-4596(11)00408-7; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

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