EPR study of the luminescent triplet state of VO/sup 3-//sub 4/ in YVO/sub 4/ and YP/sub 0. 96/V/sub 0. 04/O/sub 4/ single crystals at 1. 2 K
An EPR study with optical detection is reported of the luminescent triplet state of the VO/sup 3-//sub 4/ ion in single crystals of YVO/sub 4/ and YPO/sub 4/ doped with VO/sup 3-//sub 4/ . The experiments in an external magnetic field and in zero field can be fitted by a spin Hamiltonian for an orbitally nondegenerate triplet state. Signals originate from four symmetry-related species; the directions of the principal axes of the four ZFS tensors indicate a lowering of symmetry of the VO/sup 3-//sub 4/ ion in accordance with a static Jahn--Teller effect by which the tetrahedron tends to a trigonal pyramid on excitation. For YVO/sub 4/ the ZFS parameters are: chemically bondDchemically bond = 0.58 +- 0.04, chemically bondEchemically bond = 13.72 +- 0.04 GHz, and for YPO/sub 4/: chemically bondDchemically bond = 1.12 +- 0.04, chemically bondEchemically bond = 12.98 +- 0.04 GHz (z axisparallelV--O bond and yperpendicularac or bc crystallographic plane). For the mixed crystal the lifetimes of the individual spin levels were determined: tau/sub x/ = 0.35, tau/sub y/ = 3.3, tau/sub z/ = 1.4 ms.
- Research Organization:
- Center for the Study of the Excited States of Molecules, Huygens Laboratory, Leiden University, The Netherlands
- OSTI ID:
- 6038895
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 87:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
VANADATES
ELECTRON SPIN RESONANCE
LUMINESCENCE
TRIPLETS
YTTRIUM COMPOUNDS
DOPED MATERIALS
JAHN-TELLER EFFECT
MONOCRYSTALS
ULTRALOW TEMPERATURE
YTTRIUM PHOSPHATES
CRYSTALS
MAGNETIC RESONANCE
MATERIALS
MULTIPLETS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RESONANCE
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
360603* - Materials- Properties