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Abstract
Several series of recently synthesized chiral azobenzene liquid crystals exhibit transitions driven by both illumination and temperature: some compounds can be 'melted' from the SmC* phase to the isotropic phase by increasing illumination only; according to the phase sequences, SmA, TGBA, N*, and blue phases are also involved in such behaviour. The observed phenomena are reversible and transition temperatures are reproducible in identical light conditions. Some specific transitions have been studied. Their temperatures can be lowered to 10 degrees below the dark transition values by increasing the illumination of samples. Under illumination, those transitions exhibit first order behaviour.
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