Effect of solid-phase amorphization on the spectral characteristics of europium-doped gadolinium molybdate

A method is proposed for detecting spectral characteristics of optically inactive molybdates of rare-earth elements by their doping with rare-earth ions whose luminescence lies in the transparency region of all structural modifications of the sample. Gadolinium molybdate is chosen as the object of i...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2010-05, Vol.110 (5), p.759-768
Main Authors: Shmurak, S. Z., Kiselev, A. P., Kurmasheva, D. M., Red’kin, B. S., Sinitsyn, V. V.
Format: Article
Language:English
Subjects:
AMORPHOUS STATE
ANNEALING
CHARGED PARTICLES
Classical and Quantum Gravitation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Disorder
DOPED MATERIALS
Elementary Particles
EMISSION
EMISSION SPECTRA
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EUROPIUM COMPOUNDS
EUROPIUM IONS
EV RANGE
EXCITATION
Gadolinium
GADOLINIUM COMPOUNDS
HEAT TREATMENTS
IONS
LIGHT EMITTING DIODES
LINE BROADENING
LUMINESCENCE
MATERIALS
MATERIALS SCIENCE
MOLYBDATES
MOLYBDENUM COMPOUNDS
OPACITY
OPTICAL PROPERTIES
Order
OXYGEN COMPOUNDS
Particle and Nuclear Physics
Phase Transition in Condensed System
PHOTON EMISSION
PHYSICAL PROPERTIES
Physics
Physics and Astronomy
PRESSURE DEPENDENCE
Quantum Field Theory
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
Relativity Theory
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
Solid State Physics
SOLIDS
SPECTRA
Toy industry
TRANSITION ELEMENT COMPOUNDS
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Summary:A method is proposed for detecting spectral characteristics of optically inactive molybdates of rare-earth elements by their doping with rare-earth ions whose luminescence lies in the transparency region of all structural modifications of the sample. Gadolinium molybdate is chosen as the object of investigations, while europium ions are used as an optically active and structurally sensitive admixture. It is shown that after the action of a high pressure under which gadolinium molybdate passes to the amorphous state, the spectral characteristics of Gd 1.99 Eu 0.01 (MoO 4 ) 3 (GMO:Eu) change radically; namely, considerable line broadening is observed in the luminescence spectra and the luminescence excitation spectra, while the long-wave threshold of optical absorption is shifted considerably (by approximately 1.1 eV) towards lower energies. It is found that by changing the structural state of GMO:Eu by solid-state amorphization followed by annealing, the spectral characteristics of the sample can be purposefully changed. This is extremely important for solving the urgent problem of designing high-efficiency light-emitting diodes producing “white” light.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776110050055