6533b85afe1ef96bd12b8a4b
RESEARCH PRODUCT
Impact of aggregates on excitation dynamics in transparent polymer films doped by dipolar molecules
Martins RutkisV. GulbinasSaulius JursenasInta MuzikanteLeonas ValkunasN. KurilcikRenata Karpiczsubject
chemistry.chemical_classificationResonant inductive couplingMaterials scienceDopantExcitonDopingMetals and AlloysAnalytical chemistrySurfaces and InterfacesPolymerPhotochemistryFluorescenceSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceNanocrystalchemistryMaterials ChemistryCrystallitedescription
Abstract Optical properties of transparent polymer films of polymethylmethacrylate doped (up to 25 wt.%) by dipolar N , N -dimethylaminobenzylidene 1,3-indandione (DMABI) molecules were studied. Formation of DMABI nanocrystallites, increasing in their density and size with dopant concentration, was revealed by optical microscopy. Transformation of the fluorescence spectrum from the molecular-like emission (for the low dopant concentration below 1 wt.%) to highly red-shifted fluorescence corresponding to self-trapped excitons in the crystallites was observed. It was shown, that due to the resonant energy transfer in the blend, the DMABI nanocrystals can serve as efficient fluorescence markers. A reverse dependence on the dopant concentration was observed for high intensity excitation, when the DMABI nanocrystals act as nonradiative traps due to efficient exciton–exciton annihilation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-10-01 | Thin Solid Films |