Design and synthesis of organic small molecules with high triplet energy for blue light emission

[摘要] For the past two decades, organic light emitting diodes (OLEDs) have been the subject of intense research in the realm of display and lighting applications. Recently, thermally activated delayed fluorescence (TADF) has shown great potential in further advancing OLED technology. In order to achieve TADF, synthesis of acceptor and donor compounds has been undertaken to achieve exciplex formation. Little is currently known about exciplex formation and emission, so systematic structural variations have been performed on MCP and DPBI in order to gain fundamental knowledge. Compound analyses were performed in both the solid and solution state. In the case of MCP derivatives, demonstration of their ability to act as an acceptor is possible, alongside an appropriate choice of donor molecule. Reducing the extent ofconjugation in derivatives of DPBI, did not result in an increase in triplet energy. Consequently, to eliminate possible conformers, steric blocking was introduced in an attempt to increase the triplet energy. In the case of the ME-DPBI derivative it was shown possible to formulate a device showing 2.5% external quantum efficiency while emitting at \(\approx\)450 nm which is a true blue colour.

[发布机构] University:University of Birmingham;Department:School of Chemistry

[关键词] Q Science;QD Chemistry