Absolute photoluminescence quantum yield of perylene dye ultra-thin films

•Mono- and multilayers of two types of perylene dyes were created using Langmuir–Blodgett technique.•Photoluminescence quantum yield of the films were evaluated with absolute method.•High accuracy of QY was achieved for samples with very low absorbances.•The results are explained with steady-state spectroscopy measurements.

Using integrating sphere method we have determined the absolute photoluminescence quantum yield (QY) of two perylene derivatives in ultra-thin films. Monomolecular and multilayer films were deposited onto quartz substrates by using Langmuir–Blodgett technique. The method adopted by us allows to evaluate QY with a high accuracy for samples having absorbance down to 0.01. The evaluated luminescence quantum yield of mono- and multilayers of two 3,4,9,10-tetra-(n-alkoxy-carbonyl)-perylenes was in the range of 7–12%.

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