A study on varying the number of fluorene units in 2, 1, 3-benzothiadiazole-containing oligomers and the effect on OLED performance and stability

Lozano-Hernández, L.-A., Cameron, J. , Riggs, C. J., Reineke, S. and Skabara, P. (2022) A study on varying the number of fluorene units in 2, 1, 3-benzothiadiazole-containing oligomers and the effect on OLED performance and stability. ChemPhotoChem, (doi: 10.1002/cptc.202200256) (Early Online Publication)

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Abstract

Solution-processing has the potential to reduce the cost and energy requirements in the fabrication of organic light-emitting diode (OLED) devices. In non-doped emissive layers, polymers are commonly used, yet these can suffer from batch-to-batch variation. Oligomers, which have precise molecular structures, avoid this problem but maintain the favourable film-forming properties that polymers possess. We present three benzothiadiazole-containing fluorene-based oligomers, BT-F3 2 , BT-F4 2 and BT-F5 2 , and their use as emissive layers in OLED devices. The materials show very high photoluminescence quantum yields, with BT-F4 2 exhibiting the highest PLQY of 0.96 in a thin film. Although there is little change in the electroluminescence spectra, the oligomer size influences the device performance. BT-F3 2 had an external quantum efficiency of 1.9% and high luminance whilst BT-F4 2 reached an external quantum efficiency of 2.3%. Furthermore, the stability of the OLED devices was evaluated and showed that the device lifetime decays with increasing length of the molecules.

Item Type:Articles
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cameron, Dr Joseph and Skabara, Professor Peter and Riggs, Christopher
Authors: Lozano-Hernández, L.-A., Cameron, J., Riggs, C. J., Reineke, S., and Skabara, P.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:ChemPhotoChem
Publisher:Wiley
ISSN:2367-0932
ISSN (Online):2367-0932
Published Online:11 November 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in ChemPhotoChem 2022
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5525/gla.researchdata.1211

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
303776Light-controlled manufacturing of semiconductor structures: a platform for next generation processing of photonic devicesPeter SkabaraEngineering and Physical Sciences Research Council (EPSRC)EP/P02744X/2Chemistry
306772MEGAPeter SkabaraEuropean Commission (EC)823720Chemistry