ENERGY-TRANSFER BETWEEN LANGMUIR-BLODGETT MONOLAYERS OF ORGANIC-DYES

The Langmuir-Blodgett technique has been used to prepare multilayer structures in order to investigate the distance dependence of the nonradiative transfer of electronic energy from a donor plane of molecules to an acceptor plane. The distance between well-separated donor molecules and acceptor molecules was carefully controlled by spacer layers of arachidic acid. New systems for energy transfer studies are considered that use N-hexyl-N'-ethyl-3,4:9,10-perylenetetracarboxyldiimide (HPTCDE) and N-hexyl-3,4:9,10-perylenetetracarboxylmonoimide (HPTCO) as donors and lutetium diphthalocyanine (LuPc2) as acceptor. The limitations of the Forster dipole theory of energy transfer from a donor monolayer of point dipoles to an acceptor layer are discussed.