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Content archived on 2022-12-23

OPTICAL BISTABILITY IN MOLECULAR SYSTEMS

Objective

- 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.

Topic(s)

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Call for proposal

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Coordinator

UNIVERSITAET REGENSBURG
EU contribution
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Address
UNIVERSITAETSSTRASSE 31
REGENSBURG
Germany

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