Absolute photoluminescence quantum yield of perylene dye ultra-thin films

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%. (C) 2014 Elsevier B.V. All rights reserved.