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- W2800405886 abstract "Picosecond time-resolved optical absorption spectra induced by two-photon interband excitation of ${mathrm{LaBr}}_{3}$ are reported. The spectra are similar in general characteristics to self-trapped exciton (STE) absorption previously measured in alkali halides and alkaline-earth halides. A broad ultraviolet absorption band results from excitation of the self-trapped hole within the STE. A series of infrared and red-visible bands results from excitation of the bound outer electron within the STE similar to bands found in alkali halides corresponding to different degrees of ``off-center'' relaxation. Induced absorption in cerium-doped ${mathrm{LaBr}}_{3}$ after band-gap excitation of the host exhibits similar STE spectra, except it decays faster on the tens-of-picoseconds scale in proportion to the Ce concentration. This is attributed to dipole-dipole energy transfer from STE to ${mathrm{Ce}}^{3+}$ dopant ions. The absorption spectra were also measured after direct excitation of the ${mathrm{Ce}}^{3+}$ ions with sufficient intensity to drive two- and three-photon resonantly enhanced excitation. In this case, the spectrum attributed to STEs created adjacent to ${mathrm{Ce}}^{3+}$ ions decays in 1 ps suggesting dipole-dipole transfer from the nearest-neighbor separation. A transient absorption band at 2.1 eV growing with Ce concentration is found and attributed to a charge-transfer excitation of the ${mathrm{Ce}}^{3+*}$ excited state responsible for scintillation in ${mathrm{LaBr}}_{3}$:Ce crystals. This study concludes that the energy transport from host to activator responsible for the scintillation of ${mathrm{LaBr}}_{3}$:Ce proceeds by STE creation and dipole-dipole transfer more than by sequential trapping of holes and electrons on ${mathrm{Ce}}^{3+}$ ions." @default.
- W2800405886 created "2018-05-17" @default.
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- W2800405886 date "2018-04-18" @default.
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- W2800405886 title "Picosecond absorption spectroscopy of self-trapped excitons and transient Ce states in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>LaBr</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>LaBr</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> :Ce" @default.
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- W2800405886 doi "https://doi.org/10.1103/physrevb.97.144303" @default.
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