Synthesis of crosslinkable small and large organic molecules having OLED properties will be presented. Three strategies for the construction of multilayer devices will be described. In the first case small, well-defined OLED-molecules are functionalized with oxetanes as crosslinker. The second case deals with polymers having OLED active units in the main chain and pendant crosslinkers and finally it was shown that styrene polymers with pendant OLED functions and crosslinkers can be applied for the construction of such multilayer and multicolour devices. This is a preview of subscription content, access via your institution.
Research - Mukul Agrawal
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Novel thermally activated delayed fluorescence materials for optoelectronic applications
The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP is working on innovative solutions in the field of vacuum coating and surface treatment as well as the combination of organic electronics with classical silicon circuitry. The Fraunhofer FEP thus offers a wide range of research, development and pilot-manufacturing. Our interdisciplinary field of "Microdisplays and Sensors" is engaged in the development and manufacturing of micro-displays and sensors based on the integration of organic light emitting diodes OLED onto silicon CMOS substrates.
The electronic structures and photophysical properties of eight Pt-complexes with different N -heterocyclic carbene ligands and potential to serve as light emitting diode materials were investigated by density functional theory and time-dependent density functional theory, employing the BP86 functional for geometry optimisations, SAOP potential for excited state calculations and all-electron TZ2P basis set throughout. Non-radiative and radiative decay rate constants were determined for each system through analyses of the geometric relaxations, d-orbital splitting and spin—orbit couplings at the optimised S 0 and T 1 geometries. Three Pt-systems bound to two N -heterocyclic carbenes were shown to be nonemissive, while a fourth was shown to be emissive from the T 1 excited state. Similar T 1 -initated emission was observed for three other Pt-systems investigated, each bound to four N -heterocyclic carbenes , while a fourth similarly tetra-ligated system showed T 2 -initation of emission.