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- W2034124638 abstract "The optical properties of ${mathrm{Cr}}^{3+mathrm{ensuremath{-}}}$, ${mathrm{Nd}}^{3+mathrm{ensuremath{-}}}$, and ${mathrm{Cr}}^{3+}$:${mathrm{Nd}}^{3+mathrm{ensuremath{-}}}$doped fluoride glass (${30mathrm{B}mathrm{a}mathrm{F}}_{2mathrm{ensuremath{-}}}$${18mathrm{I}mathrm{n}mathrm{F}}_{3mathrm{ensuremath{-}}}$${12mathrm{G}mathrm{a}mathrm{F}}_{3mathrm{ensuremath{-}}}$${20mathrm{Z}mathrm{n}mathrm{F}}_{2mathrm{ensuremath{-}}}$${10mathrm{Y}mathrm{F}}_{3mathrm{ensuremath{-}}}$${6mathrm{T}mathrm{h}mathrm{F}}_{4mathrm{ensuremath{-}}}$${4mathrm{Z}mathrm{r}mathrm{F}}_{4}$) have been investigated in the 4.2--300-K temperature range at several concentrations by using steady-state and time-resolved laser spectroscopy. The luminescence of trivalent chromium in singly-doped glass shows a strong thermal quenching and can be analyzed on the basis of two broad statistical site distributions. The luminescence quenching of the $^{4}$${mathit{F}}_{3/2}$${ensuremath{rightarrow}}^{4}$${mathit{I}}_{11/2}$ laser transition of ${mathrm{Nd}}^{3+}$ in singly-doped glass has been studied by investigating the thermal and concentration dependence of lifetimes. A ${mathit{T}}^{3}$ dependence for the nonradiative ${mathrm{Nd}}^{3+mathrm{ensuremath{-}}}$${mathrm{Nd}}^{3+}$ relaxation has been found in the 15--100-K temperature range at high ${mathrm{Nd}}^{3+}$ concentrations, which is in agreement with a two-site nonresonant process. ${mathrm{Cr}}^{3+}$-to-${mathrm{Nd}}^{3+}$ radiative and nonradiative energy transfer in codoped glass has been demonstrated from the emission spectra and the decrease of ${mathrm{Cr}}^{3+}$ fluorescence lifetimes. The comparison between the time-resolved emission spectra of ${mathrm{Cr}}^{3+}$ singly-doped and codoped samples indicates a very rapid ${mathrm{Cr}}^{3+}$ensuremath{rightarrow}${mathrm{Nd}}^{3+}$ energy-transfer process with a lower limit of ${10}^{7}$ ${mathrm{s}}^{mathrm{ensuremath{-}}1}$. The nonradiative ${mathrm{Cr}}^{3+}$ensuremath{rightarrow}${mathrm{Nd}}^{3+}$ energy transfer is consistent with an electric-dipole--electric-dipole interaction mechanism. The transfer efficiency corrected for ${mathrm{Nd}}^{3+mathrm{ensuremath{-}}}$${mathrm{Nd}}^{3+}$ self-quenching is in agreement with the measured ${mathrm{Nd}}^{3+}$ luminescence transferred by ${mathrm{Cr}}^{3+}$ donors." @default.
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- W2034124638 title "Optical properties of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Cr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:…" @default.
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- W2034124638 doi "https://doi.org/10.1103/physrevb.46.5169" @default.
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