Executive Summary : | Organic light emitting diode (OLED)-based electronic display devices often use anti-glare filters to reduce light reflection, causing a 50% reduction in electroluminescence. To overcome this, luminophores with circularly polarized luminescence (CPL) can be used, which can cross these filters with minimal attenuation. Doping the emissive layer of OLED with chiral emitters with high efficiency and circular polarization is the basic pathway for fabricating CPL devices. However, the external quantum efficiencies limit of 5% for fluorescent emitters poses a major challenge. Thermally activated delayed fluorescence (TADF) is a successful mechanism to address these drawbacks while maintaining 100% theoretical efficiency. TADF molecules require a small energy gap between the first excited singlet and triplet state, enabling reverse intersystem crossing. The separation of HOMO and LUMO in the organic molecule is achieved using strong donor and acceptor units and stearic hindrance. The synthesis of new organic chiral TADF molecules using pyrazine as an acceptor and three different donor groups (triphenylamine, carbazole, and diphenylamine) is proposed. The project aims to study the impact of these donor groups on singlet-triplet energy gap, HOMO-LUMO distribution, optical and electroluminescence properties of fabricated OLED devices theoretically and experimentally. |