Novel liquid crystalline organic semiconducting oligomers incorporating N-heterocyclic carbazole moieties for fluorescent OLEDs

Hu, Guang; Kitney, Stuart P.; Kelly, Stephen M.; Harrison, William; O’Neill, Mary

Abstract

A novel class of nematic liquid crystalline organic semiconducting oligomers incorporating N-heterocyclic carbazole moieties has been synthesised using simple and highly efficient reaction pathways. The electroluminescent colour of these novel oligomers can be varied in a controlled manner by molecular design. The values of the ionisation potential and the electron affinity of these electroluminescent oligomers can also be matched by structural design to the Highest Occupied Molecular Orbital (HOMO) energy level of the electron-blocking layer and the Lowest Unoccupied Molecular Orbital (LUMO) energy level of electron-transporting layer in the Organic light emitting diodes to create low charge-injection barriers for electrons and holes, respectively leading to electroluminescence with an efficacy up to 4.1 cd A−1.

Citation

Hu, G., Kitney, S. P., Kelly, S. M., Harrison, W., & O’Neill, M. (2017). Novel liquid crystalline organic semiconducting oligomers incorporating N-heterocyclic carbazole moieties for fluorescent OLEDs. Liquid crystals, 44(11), 1632-1645. https://doi.org/10.1080/02678292.2017.1306633

• Journal Article Type: Article
• Acceptance Date: Mar 10, 2017
• Online Publication Date: Mar 23, 2017
• Publication Date: Sep 2, 2017
• Deposit Date: Sep 21, 2017
• Publicly Available Date: Mar 27, 2018
• Journal: Liquid crystals
• Print ISSN: 0267-8292
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• Volume: 44
• Issue: 11
• Pages: 1632-1645
• DOI: https://doi.org/10.1080/02678292.2017.1306633
• Keywords: Nematic liquid crystalline; Oligomers; Carbazole; Synthesis; Electroluminescent; OLED
• Public URL: https://hull-repository.worktribe.com/output/454928
• Publisher URL: http://www.tandfonline.com/doi/full/10.1080/02678292.2017.1306633
• Related Public URLs: http://irep.ntu.ac.uk/id/eprint/30575/
• Additional Information: This is the accepted manuscript of an article published in Liquid crystals,; 2017. The version of record is available at the DOI link in this record.
• Contract Date: Mar 27, 2018