Objetivo - 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. Programa(s) IC-ISC C - Activity (Euratom, EEC) on cooperation in science and technology, 1984- Tema(s) Data not available Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador UNIVERSITAET REGENSBURG Aportación de la UE Sin datos Dirección UNIVERSITAETSSTRASSE 31 REGENSBURG Alemania Ver en el mapa Enlaces Sitio web Opens in new window Coste total Sin datos
