Add time:08/08/2019         Source:sciencedirect.com

On increasing the amount of myristic acid in mixed multilayers of 7-(2-anthryl)-heptanoic acid (2A7) and myristic acid the emission of shallow traps emitting at 420 nm is favoured compared with that of deeper traps emitting at 455 nm. This change in the emission spectrum is accompanied by a change in the excitation spectrum from a spectrum resembling the absorption spectrum of an anthracene single crystal to a spectrum resembling the absorption spectrum of a dilute solution of 2A7. To obtain more efficient mixing, myristic acid was replaced by 8-(2-naphthyl)-octanoic acid (2N8). On excitation at 340 nm, where light absorption is mainly due to the anthracene chromophores, the emission of mixed multilayers of 2A7 and 2N8 with a mixing ratio of 1:2 is mainly due to the shallow traps emitting at 420 nm, where light absorption is mainly due to 2N8, the emission spectrum resembles that of a dilute solution of 2A7 at mixing ratios between 1:2 and 1:200. These spectral data suggest that in addition to isolated molecules of 2A7 dissolved in 2N8, there exists in mixed Langmuir-Blodgett films of 2A7 and 2N8 or myristic acid also a second phase containing aggregated 2A7 molecules. While excitation at 290 nm will favour the population of the excited state of isolated molecules of 2A7 by energy transfer from 2N8, excitation at 340 nm will favour the excitation of aggregated 2A7 molecules.

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