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

Sahotra, Nikhil (2018). Design and synthesis of organic small molecules with high triplet energy for blue light emission. University of Birmingham. Ph.D.

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Abstract

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.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Supervisor(s):
Supervisor(s)EmailORCID
Baranoff, EtienneUNSPECIFIEDUNSPECIFIED
Davies, PaulUNSPECIFIEDUNSPECIFIED
Licence:
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Chemistry
Funders: Engineering and Physical Sciences Research Council, Other
Other Funders: The University of Birmingham
Subjects: Q Science > QD Chemistry
T Technology > TP Chemical technology
URI: http://etheses.bham.ac.uk/id/eprint/8096

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