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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