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Durham University

Research & business

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Publication details for Professor Andy Monkman

F.R.P. Limberg, A. Miasojedovas, P. Pingel, F. Reisbeck, S. Janietz, A.P. Monkman & H. Kruger (2015). Hole-transporting side-chain polystyrenes based on TCTA with tuned glass transition and optimized electronic properties. Rsc Advances 5(101): 83122-83128.

Author(s) from Durham

Abstract

The development of crosslinkable materials for the fabrication of solution processable OLEDs presents challenges, especially regarding the adjustment of the glass transition (Tg), which has a significant influence on crosslinking kinetics and device life-time. Crosslinkable hole transport materials based on poly(N, N-bis(4-(9H-carbazol-9-yl)phenyl)-4-vinylaniline) (poly-TCTA) with covalently attached plasticizers for Tg control and azide functionalities for azide-alkyne crosslinking are presented. These polymers have an optimal T-g of around 150 degrees C and show superior crosslinking performances and solution resistibilities. Incorporation of electron-pushing alkoxides to the pendant groups combines the Tg adjustment approach with a systematic tuning of the HOMO level from -5.7 to -5.3 eV. All presented polymers have good charge transport and injection properties and are ideal for applications in phosphorescent OLEDs due to their high triplet energies (>2.8 eV). The new crosslinkable poly-TCTA-based materials are applied as hole-transport layers (HTLs) in fully solution-processed OLEDs. An improvement of the device performance is demonstrated for OLEDs with additional crosslinked HTL.