Abstract
This paper reports the incorporation of a non-amphiphilic aromatic hydrocarbon, 9-phenylanthracene (PA), in Langmuir–Blodgett (LB) films mixed with stearic acid (SA), and their spectroscopic properties. The surface pressure–area per molecule isotherms mixed with SA were measured at different molar ratios. From the investigation of absorption and emission spectra and scanning electron microscopy, PA is found to form aggregates. A broad emission was found in both LB films and ethanol–water mixtures, with a maximum at ∼475 nm at room temperature, which is probably aggregation induced. At 77 K, the emission maximum was found to be at ∼508 nm. Emission shift as a result of temperature is explained in terms of exciton–phonon coupling.
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