ORGANIZED CAROTENOID FILMS - EXCITED-STATES AND DUAL EMISSIONS

The absorption, emission and excitation spectra of crocetin dialdehyde (CDA) were obtained in solution and in Langmuir-Blodgett (LB) films. Dual fluorescence was observed in both cases and, for the first time, in an organized molecular layer of a carotenoid. Comparison of the emi ssion and absorption spectra in solution and LB films suggests the for mation of aggregates in LB films. The observation of dual emission and the shift in the excited states in carotenoid LB films are discussed with particular relevance to the possible self-organization in photosy nthetic light-harvesting antennae.