Depolarization of Photoluminescence of Isotropic Solutions Produced by Excitation Energy Migration

1987 ◽  
Vol 42 (8) ◽  
pp. 813-818
Author(s):  
A. Kawski ◽  
J. Kamiński
Keyword(s):  
Experimental Data ◽  
Energy Transfer ◽  
Excitation Energy ◽  
Master Equation ◽  
Shell Model ◽  
Excitation Energy Transfer ◽  
Critical Distance ◽  
Energy Migration ◽  
Isotropic Solution ◽  
Fluorescence And Phosphorescence

A theory of the excitation energy transfer between like molecules in isotropic solution based on a centre or shell model of a primarily excited luminescent molecule and on the extended Förster “excitation master equation” has been elaborated. Fluorescence and phosphorescence depolarization are shown to be governed by singlet-singlet energy migration and described by the same expression. The comparison of the theoretical curve with the experimental data obtained by Gondo et al. (1975) for benzo[f]quinoline in ethanol glass at 77 K results in the following critical distance R0 for the excitation energy migration: 21.5 Å for fluorescence and phosphorescence, respectively.

Elektronenanregungsenergieübergang zwischen gleichartigen Molekülen in Lösung / Electronic Excitation Energy Transfer among like Molecules in Solution

1977 ◽  
Vol 32 (12) ◽  
pp. 1339-1343
Author(s):  
J. Kamiński ◽  
A. Kawski
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Shell Model ◽  
Electronic Excitation ◽  
Excitation Energy Transfer ◽  
Photo Luminescence ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy ◽  
Emission Anisotropy ◽  
Good Agreement

Abstract Electronic Excitation Energy Transfer among like Molecules in Solution A theory of the excitation energy transfer among like (bomotransfer) molecules in solution, based on a shell model of the luminescent centre and on the assumptions given in our previous paper * is elaborated. Expressions for the time-dependent concentration depolarisation of the photo-luminescence (for emission anisotropy) in the sphere-and the shell-model are obtained. The expression for the concentration-dependent depolarisation is compared with the experimental results for five luminescent compounds in rigid cellulose acetate films. Good agreement was found with the equation which takes into account the excitation energy remigration.

Energieübertragung zwischen gleich-und ungleichartigen Molekülen in Lösung III. Experimente über Fluoreszenzlöschung durch absorbierende Fremdstoffe/ Energy Transfer Among Like and Unlike Molecules in Solution III. Study of Fluorescence Quenching by Foreign Absorbing Substances

1975 ◽  
Vol 30 (12) ◽  
pp. 1611-1614 ◽  
Author(s):  
A. Kawski ◽  
M. Stoń
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Excitation Energy ◽  
Shell Model ◽  
Electronic Excitation ◽  
Critical Distance ◽  
Electronic Excitation Energy ◽  
Radiationless Energy Transfer ◽  
Good Agreement ◽  
Luminescent Centre

Abstract Energy Transfer Among Like and Unlike Molecules in Solution 111. Study of Fluorescence Quenching by Foreign Absorbing Substances Radiationless energy transfer between unlike molecules (heterotransfer) in fluid solutions was studied by the quenching of fluorescence by foreign absorbing substances. The quenching of electronic excitation energy of 2-aminopurine and 2-aminopyrimidine, acting as sensitizers, and by acridine or 9-methylanthracene, acting as acceptors, was investigated in ethanol and compared with the theory of "multi-shell model" of a luminescent centre. In fluid solutions the critical distance for energy transfer is little depended on the diffusion. Good agreement was found with the equation taking into account only the excitation energy migration.

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