Project details


Research Topic A

A1 Electroactive molecular glasses for OLED and OPV applications
This multidisciplinary sub-topic requires competence in organic chemistry, material science, physics and electronics. The large number of publications in journals of the Nature Publishing Group (e.g. Nature Materials) is testament to the strong interest of researchers in organic (opto)electronics. In particular, in recent years, the efforts of advanced research laboratories have been concentrated on the development of OLED and OPV devices on the basis of organic large area electronic (OLAE) technology.

Over the past decade DOT-KTU has gained considerable international experience in the design, synthesis, characterization and application of electroactive low-molar-mass materials in organic optoelectronic devices from close cooperation with major electronics and chemical companies such as Samsung Electronics, Imation and BASF AG. The collaboration with Samsung Electronics resulted in more than 50 US, Japanese and European patents. Electroactive low-molar mass high triplet energy materials developed by DOT-KTU have enabled the creation of very efficient multilayer phosphorescent OLED devices. In the field of OPV, very efficient dye-sensitised-solar-cells (DSSC) were developed by DOT-KTU in collaboration with BASF AG AG. DOT-KTU was responsible for the design, synthesis and characterisation of hole-transporting materials with low ionization potentials, high charge mobility, and morphological stability of the glassy state. DOT-KTU’s organic synthesis approach has enabled the development of families of molecules which can provide important information on chemical property – structure relationships, which is necessary for the optimisation of structures for OLED and OPV.

However, DOT-KTU needs to enhance its knowledge and facilities in order to be able to design, synthesise and characterise new effective charge-transporting molecular glasses for OLED and OPV applications (including those possessing high triplet energies and required ionization potentials). Therefore, in the framework of the CEOSeR project, DOT-KTU will undertake knowledge exchange with twinning partners in the following specific areas:

> A1.1) Computational design and synthesis of electroactive molecules with the required set of properties by advanced synthetic methods
> A1.2) Formation and optimisation of OLED and OPV device structures

High performance liquid chromatography merged with mass spectrometer feature (liquid chromatography / mass spectrometry) will allow DOT-KTU to control constantly the quality and purity of the synthesised low-molar-mass materials.

A2 Low-molar-mass materials with increased molecular order and high charge mobilities for OFET applications
Organic semiconducting materials offer the advantage of solution processability into flexible films. In some cases, their drawback is based on their low charge carrier mobility, which is directly related to the packing of the molecules. Various methods for increasing the extent of ordering, facilitating the processing, and improving the performances of the charge mobility have been employed. Among these, the freezing of highly ordered phase into stable, roomtemperature glass appear to be an attractive strategy since the anisotropic properties and macroscopically aligned monodomains can be easily vitrified and the ordering preserved. At the same time, the desired orientation for the application (e.g. field-effect transistor) can be obtained.

In this context, DOT-KTU is interested in the design and the synthesis of new calamitic/discotic materials and in the investigation of their thermal, optical, photophysical and (opto)electrical behaviour. Indeed, it is expected that these materials offer a possibility of supramolecular ordering and therefore high charge mobilities which are esential for state-of-the-art organic electronics devices.

DOT-KTU has gained considerable research experience recently in the field of design, synthesis and characterisation of liquid crystalline materials by participation in the FP7 Marie Curie Initial Training Network project “Functional liquid crystal dendrimers: synthesis of new materials, resource for new applications”. Nevertheless, in order to further support the development of ordered electroactive materials for OLAE technologies, DOT-KTU‘s researchers need to develop their knowledge in the following fields:

> A2.1) Computational design and synthesis of functionalised conjugated heterocyclic molecules using advanced synthetic methods, e.g. intramolecular cycloadditions
> A2.2) Testing of the synthesised materials in OFET devices and studying the structure-properties relationship

(REGPOT-2012-2013-1 REGPOT-2012-2013-1 ICT) UNDER GRANT AGREEMENT NO. 316010
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