Multiphonon relaxation in rare-earth doped fluorozirconate-based glasses containing BaCl sub(2) nanocrystals

Nd super(3+)-doped fluorozirconate-based glasses which contain hexagonal BaCl2 nanocrystals are analyzed for their photoluminescence and multiphonon relaxation (MPR) properties. The MPR rates of various Nd super(3+) levels are obtained from time-resolved spectroscopy using selective laser pulse exci...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-01, Vol.26 (2), p.1-10
Main Authors: Pfau, C, Skrzypczak, U, Ahrens, B, Schweizer, S
Format: Article
Language:English
Subjects:
Condensed matter
Decay
Decay rate
Glass
Nanocrystals
Photoluminescence
Quantum efficiency
Rare earth metals
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Summary:Nd super(3+)-doped fluorozirconate-based glasses which contain hexagonal BaCl2 nanocrystals are analyzed for their photoluminescence and multiphonon relaxation (MPR) properties. The MPR rates of various Nd super(3+) levels are obtained from time-resolved spectroscopy using selective laser pulse excitation. The nonradiative decay rates are estimated from the difference between measured and calculated radiative decay rates as well as from the analysis of luminescence rise times. The MPR rates display an exponential dependence on the energy gap. Temperature-dependent studies of the decay indicate that phonons of the BaCl sub(2) nanocrystals are involved in the MPR processes leading to extremely low MPR rates which are orders of magnitude lower than in conventional oxide and halide glasses. Photoluminescence emissions, which are usually quenched by MPR, and enhanced radiative quantum efficiencies are found.
ISSN:0953-8984
1361-648X
DOI:10.1088/09538984/26/2/025406