Objectif - To find a suitable organic dye for optical bistability and fast optical switching involving the triplet state;- To develop spectroscopic techniques to measure the triplet state quantum yield and the triplet-triplet absorption dynamics;- To analyse in detail the singlet and triplet absorption and emission dynamics of a selected organic dye of high triplet quantum yield.- A good understanding of the singlet and triplet absorption spectroscopic behaviour of eosin Y was obtained. Absolute singlet excited state absorption cross-section spectra and triplet-triplet absorption cross-section spectra were determined. A new technique for triplet quantum yield measurement and intersystem-crossing rate determination was developed and was applied to the measurement of the intersystem-crossing rate of eosin Y in methanol and eosin Y in water.Follow-up- The project started our interest in the triplet spectroscopy of organic dyes. We continued to study intersystem crossing. We studied the higher excited-state triplet to singulet intersystem crossing by double-pulse picosecond excitation and fluorescence detection. A fluorescence detection technique was developed to determine the quantum yield of triplet formation by S1-T1 intersystem crossing. The intersystem crossing rate of some organic dyes has been determined.- Measurement of linear absorption and emission spectra of eosin Y;- Measurement of absolute S1 -state excited-state absorption cross-section spectrum of eosin Y in methanol by picosecond laser pulse excitation and time-delayed picosecond light continuum probing;- Measurement of triplet quantum yield and intersystem-crossing rate of eosin Y in methanol and water by picosecond double pulse transient absorption measurements;- Measurement of triplet-triplet absorption of methanol using nanosecond excimer laser triplet population and picosecond light continuum absorption probing in the triplet state. Programme(s) IC-ISC C - Activity (Euratom, EEC) on cooperation in science and technology, 1984- Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur UNIVERSITAET REGENSBURG Contribution de l’UE Aucune donnée Adresse UNIVERSITAETSSTRASSE 31 REGENSBURG Allemagne Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée
