2000
DOI: 10.1016/s0022-2313(00)00172-1
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Photon echoes in doped organic amorphous systems over a wide (0.35–50K) temperature range

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Cited by 49 publications
(40 citation statements)
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“…Given the flexible side chains attached to the bay positions, in particular for the PBI C derivative, such contributions are not unlikely and have been observed previously, for example for tetra-tert-butylterrylene (TBT) in polymethylmethacrylate (PMMA) by photon echo spectroscopy. [52] Consequently, the smallest values that have been observed for the linewidth can serve only as an estimate for the lower bound to the low-temperature lifetime of the PBI derivatives in hexadecane. These considerations yield as lower limits 6.4 ns for PBI A, 5.9 ns for PBI B, and 5.5 ns for PBI C. For better comparison the fluorescence lifetimes (and boundaries) obtained under various experimental conditions are summarized in Table 3.…”
Section: Discussion Fluorescencementioning
confidence: 99%
“…Given the flexible side chains attached to the bay positions, in particular for the PBI C derivative, such contributions are not unlikely and have been observed previously, for example for tetra-tert-butylterrylene (TBT) in polymethylmethacrylate (PMMA) by photon echo spectroscopy. [52] Consequently, the smallest values that have been observed for the linewidth can serve only as an estimate for the lower bound to the low-temperature lifetime of the PBI derivatives in hexadecane. These considerations yield as lower limits 6.4 ns for PBI A, 5.9 ns for PBI B, and 5.5 ns for PBI C. For better comparison the fluorescence lifetimes (and boundaries) obtained under various experimental conditions are summarized in Table 3.…”
Section: Discussion Fluorescencementioning
confidence: 99%
“…In the first studies the measured T-dependences of homogeneous line widths in glasses were interpreted taking into account an interaction of the impurity centre with one or two low-frequency vibrational modes (LFMs) within the frequency range 10-30 cm -1 (see, for example [19,20]). However, the lowfrequency Raman and inelastic neutron scattering experiments, which yield direct information about LFM spectrum, have not confirmed the existence of such discrete modes.…”
Section: Description Of Experimental T-dependences Of Optical Dephasimentioning
confidence: 99%
“…The procedure of experimental data analysis was the following (see, for example, [20]). First, the low-temperature points (T < 1-2 K) were fitted with a power law with Eq.…”
Section: Description Of Experimental T-dependences Of Optical Dephasimentioning
confidence: 99%
“…A lot of new information about the dynamics of low-temperature glasses has been obtained with these techniques (for reviews see Refs. [12][13][14][15][16] and references therein). It was shown that at To1-2 K the TLSs are mainly contribute to the line-broadening processes in mixed glasses: Slow transitions in TLSs lead to spectral diffusion, whereas fast flips cause optical dephasing.…”
Section: Introductionmentioning
confidence: 99%
“…At T > 2-3 K the picture begins to be more complicated. At these temperatures the contribution of quasi-localized low-frequency vibrational modes (LFMs) of the amorphous matrix begins to play a role [15,17,18]. First consideration of this contribution, took into account only one or two discrete LFMs with frequencies in the range 10-30 cm À1 (in analogy with the case of mixed crystals) (see, for example, Refs.…”
Section: Introductionmentioning
confidence: 99%