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- W2035744922 abstract "We extend in this work the previously obtained results that the presence of sufficient amounts of statistically distributed ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ defects in KCl drastically quench the F-center luminescence, photoconductivity, and excited state (${mathit{F}}^{mathrm{*}}$) lifetime ensuremath{tau}(${mathit{F}}^{mathrm{*}}$). The extension to three new host materials (KBr, RbCl, RbBr) will test whether the ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ reorientation rate (${mathrm{ensuremath{tau}}}_{mathrm{reor}}^{mathrm{ensuremath{-}}1}$) plays the decisive role in this strong ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ dipole ${mathit{F}}^{mathrm{*}}$-center interaction effect. While for the earlier studied host KCl above 10 K, the ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ reorientation rate is extremely high [${mathrm{ensuremath{tau}}}_{mathrm{reor}}^{mathrm{ensuremath{-}}1}$(${mathrm{OH}}^{mathrm{ensuremath{-}}}$)>${10}^{10}$ ${mathrm{sec}}^{mathrm{ensuremath{-}}1}$], KBr, RbCl, and RbBr have at 10 K dipolar reorientation times long compared to the radiative F-center lifetime, ${mathrm{ensuremath{tau}}}_{mathrm{reor}}$(${mathrm{OH}}^{mathrm{ensuremath{-}}}$)ensuremath{gg}ensuremath{tau}(${mathit{F}}^{mathrm{*}}$). Under temperature increase, however, the ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ dipolar reorientation rates speed up drastically, so that one reaches the opposite condition ${mathrm{ensuremath{tau}}}_{mathrm{reor}}$(${mathrm{OH}}^{mathrm{ensuremath{-}}}$)ensuremath{ll}ensuremath{tau}(${mathit{F}}^{mathrm{*}}$). We find indeed that in these materials, the F luminescence is nearly fully efficient and of long lifetime below 15 K but becomes quenched drastically and short in lifetime when increasing the ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ reorientation rate with the temperature. Quantitative analysis shows that the ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ reorientation time must be about four orders of magnitude shorter than the radiative ${mathit{F}}^{mathrm{*}}$ lifetime, in order to fully quench the F luminescence. In contrast to these statistically distributed F-center and ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ defect systems, aggregated pairs of both defects [${mathit{F}}_{mathit{H}}$(${mathrm{OH}}^{mathrm{ensuremath{-}}}$) defects] show in all hosts, nearly independent of temperature, very strong luminescence quenching. All these results are analyzed and discussed within dynamical ${mathrm{OH}}^{mathrm{ensuremath{-}}}$ reorientational models." @default.
- W2035744922 created "2016-06-24" @default.
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- W2035744922 date "1995-09-01" @default.
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- W2035744922 title "Relationship betweenOH−defect reorientation rates and the quenching of theF-center luminescence in alkali halides" @default.
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- W2035744922 doi "https://doi.org/10.1103/physrevb.52.7094" @default.
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