Measurements on gain and fast nonradiative relaxation of optically excited F-centers in KCI

Belke, S.; Schubert, M.; Vogler, K.

doi:10.1016/0030-4018(81)90068-7

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…Because of its long-range interaction mechanism this process should be superior to a tunneling process connected with temporary F'-centre generation a t the mean F-centre concentrations used experimentally. Besides, in this connection a temporary F'-centre formation has not been observed [19]. However, the above-mentioned long-range interaction cannot be sufficiently explained by the original Forster model [25,261.…”

Section: Discussionmentioning

confidence: 80%

“…I n this case the time evolution of the fluorescence is described by a single exponential law with a decay deactivation is caused by a n interaction process between the F-centres. Other tentative explanations (especially the assumption of a shortening of the ground state recovery time by stimulated emission [22], or emission starting from higher nearly degenerated sublevels of the RES [23], or a simulation of a transmission peak by coherent diffraction [24], or fast relaxation of excited M-centres) can be definitely excluded [19].…”

Section: Discussionmentioning

confidence: 99%

“…I n this scheme level 3 corresponds to the relaxed excited state (RES) and the ground state recovery time + TZ3 + T,, a t LNT can be considered to be equal to the fluorescence decay time z. We have demonstrated clearly by other methods of ps spect'roscopy a t F-centres in KC1 [19], that both nonradiative relaxation times T23 and T41 in the excited state and the ground state, respectively, are less than the laser pulse duration zL ( T23, T41 < zL = 10 ps). The F-absorption band is homogeneously broadened up to this time range.…”

Section: Methods Of Measurementmentioning

confidence: 95%

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Experimental and Theoretical Investigations on the Picosecond Deactivation Process of Excited F‐Centres in KCl

Schubebt

Vogler

1980

Physica Status Solidi (b)

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The deactivation behaviour of optically excited F‐centres in KCl is investigated for the first time by picosecond laser spectroscopy. It is found, that a certain portion of them returns to the ground state during 20 to 150 ps. This fast deactivation process, which depends on the F‐center concentration and the coloration method, can be explained by a model based on energy transfer between excited F‐centres, whereby an inhomogeneous spatial distribution can be taken into account. The critical transfer distance is observed to be R0 = (106 ± 15) Å. Quantitative characteristic results about the inhomogeneous spatial distribution of the F‐centres are presented.

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Methods Of Measurementmentioning

confidence: 95%

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Experimental and Theoretical Investigations on the Picosecond Deactivation Process of Excited F‐Centres in KCl

Schubebt

Vogler

1980

Physica Status Solidi (b)

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“…Measurements of VR of F centers in KCl were made by Belke et al (1981) using a pump-probe technique to measure the gain induced by an intense pump beam.…”

Section: Literature Reviewmentioning

confidence: 99%

Picosecond Time-Resolved Spectroscopic Study of Vibrational Relaxation Processes in Alkali Halides

Knox

1984

International Conference on Luminescence - 1984

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The vibrational dynamics of fluorescent defects in alkali halides are interesting for a number of reasons. Information on electron-phonon interactions, relaxation of localized excitations and energy transfer phenomena may be obtained from a detailed study of the fluorescence properties at short times after optical excitation. In particular, the vibrational state, or states, of an impurity center may be directly determined from the time-resolved fluorescence spectrum under certain conditions, revealing details about internal energy relaxation processes. Recent advances such as the modelocked color center laser [1] and the demonstration of vibrational fluorescence [2] have provided increased interest in the vibrational properties of defects and defect systems in alkali halides.

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Long‐Range Energy Transfer in the Case of Inhomogeneous Spatial Distributions and Indirect Donor‐Donor Interaction

Schubert

1986

Annalen der Physik

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A b s t r a c t. On the basis of Forster kinetics concerning long-range energy transfer caused by dipole-dipole interaction the it-deactivation-law has been derived under the assumption of a homo-1 geneous spatial acceptor distribution (at the end of the forties). Recently, in particular ultra-short time fluorescence and absorption measurements have shown that on the one hand this law holds in a wide range of physical conditions, but that under other circumstances the experimental results strongly deviate from the it-law. I n the present paper it is shown that a unified treatment of inhomogeneous distributions and indirect donor-donor interaction via the acceptors can qualitatively, and i n certain cases also quantitatively, remove the discrepancies mentioned. The analysis yields new parameters of dynamical processes.

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Measurements on gain and fast nonradiative relaxation of optically excited F-centers in KCI

Cited by 15 publications

References 8 publications

Experimental and Theoretical Investigations on the Picosecond Deactivation Process of Excited F‐Centres in KCl

Experimental and Theoretical Investigations on the Picosecond Deactivation Process of Excited F‐Centres in KCl

Picosecond Time-Resolved Spectroscopic Study of Vibrational Relaxation Processes in Alkali Halides

Long‐Range Energy Transfer in the Case of Inhomogeneous Spatial Distributions and Indirect Donor‐Donor Interaction

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