Determination of Partial Photochemical Quantum Yields of Reversible Photoisomerizations of Stilbene-1 Derivatives

Partial photochemical quantum yields of derivatives of stilbene-1 can be determined by a new microprocessor controlled apparatus for the measurement of fluorescence intensities in dependence on reaction time. The consecutive photoproducts must not be known. Some of the 20 examined dyes show laser activity combined with relatively high photostability. Photochemical quantum yields and laser peak power were determined in dependence on structure. A detailed knowledge of the photokinetic parameters gives the opportunity to obtain indications of efficient and photostable laser dyes.