Luminescence in trilanthanumtrichlorotungstate (La/sub 3/WO/sub 6/Cl/sub 3/)

Journal Article · Tue Mar 01 04:00:00 EST 1983 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(83)90153-6· OSTI ID:5747637

Blasse, G ^[1]; Dirksen, G J; Brixner, L H

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1. State Univ., Utrecht, The Netherlands

The luminescence properties of La/sub 3/WO/sub 6/Cl/sub 3/ are reported and discussed. The tungstate group occurs as a trigonal prismatic WO/sub 6//sup 6 -/ complex. The blue luminescence is, for the greater part, quenched at room temperature. No energy migration occurs in this lattice. The decay times are discussed in terms of a simple moleclar-orbital (MO) scheme. The luminescence of the following activating ions was studied: Mo/sup 6 +/, Bi/sup 3 +/, Eu/sup 3 +/, Sm/sup 3 +/, Ce/sup 3 +/, and Tb/sup 3 +/. The molybdate group produces a red emission with low efficiency. The Bi/sup 3 +/ ion induces a narrow band emission with small Stokes shift. This is interpreted using a Bi/sup 3 +/-O/sup 2 -/-W/sup 6 +/ charge-transfer state.Except for Ce/sup 3 +/, the rare earth activators show luminescence, but the total transfer efficiency from tungstate to the rare-earth ions is low. This is not due to the one-step tungstate-rare-earth transfer (which is efficient), but to the localized nature of the tungstate excitation. The Eu/sup 3 +/ charge-transfer band is at very low energies.

• OSTI ID: 5747637
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 46:3; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ALKALI METAL COMPOUNDS
BISMUTH COMPOUNDS
CATIONS
CESIUM COMPOUNDS
CHARGED PARTICLES
CHEMICAL ACTIVATION
CHLORINE COMPOUNDS
ENERGY TRANSFER
EUROPIUM COMPOUNDS
HALOGEN COMPOUNDS
IONS
LANTHANUM COMPOUNDS
LANTHANUM TUNGSTATES
LUMINESCENCE
MOLYBDENUM COMPOUNDS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
TERBIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES