Abstract
An alternant poly(dihexyl fluorene-co diphenyl oxadiazole) has been synthetized by microwave-assisted oxidative polymerization. The structure has been confirmed by 1H-NMR and FTIR spectroscopies. Gel permeation chromatography indicated high molecular weight and low polydispersity index. DFT calculations suggested a complete separation of HOMO and LUMO orbitals, which were located on fluorene and oxadiazole moiety, respectively. X-ray diffraction, polarized light microscopy, and atomic force microscopy indicated the polymer tendency to stack into a layered morphology with a more compact structure for the films prepared by spin coating. Furthermore, UV-vis and photoluminescence spectroscopies indicated the formation of H-aggregates which played a key role in photoluminescence quenching in solid state. Nevertheless, the good charge mobility gained due to the orbital overlapping in H-aggregates led to excellent electroluminescence, which enabled the development of white OLED devices with outstanding stability.
Highlights
Light emitting diodes based on organic materials (OLEDs) stimulated extensive research worldwide in an effort to attain efficient organic electroluminescent materials with high lifetime and efficiency
In this paper we report on the synthesis of the poly(dihexyl fluorene-co-diphenyl oxadiazole) by microwave-assisted oxidative polymerization, its properties, and building of an organic light emitting diode
AApoly(fluorene–oxadiazole) polymer has been prepared using theusing microwave-assisted synthesis synthesis forpoly(fluorene–oxadiazole) the first time. This method showed the advantages of easy synthesis mild reaction synthesis for the first time
Summary
Light emitting diodes based on organic materials (OLEDs) stimulated extensive research worldwide in an effort to attain efficient organic electroluminescent materials with high lifetime and efficiency. One approach in reaching this goal is designing π-conjugated polymers, known to have distinct over inorganic materials They are cheaper, lighter, and can be processed from solution or molten state, either as thin films or complex patterns, by simple casting, inkjet printing, or lithographic processes, opening new opportunities towards flexible devices. The electroactive and photoactive polyfluorene is recognized as a reference polymer in OLED development, leading to devices with high efficiency and stability It is a versatile blue light emitting polymer, whose emission color can be tuned by structural engineering or even simple doping, offering multiple possibilities for the preparation of materials with tuned properties [6,7,8,9,10]. Poly(dihexylfluorene) has been obtained in similar conditions in order to properly asses the structural characterization data and the photophysical properties
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