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. (2023) 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, 7(3), e202200256. (doi: 10.1002/cptc.202200256)

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: Published
• 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 7(3): e202200256
• Publisher Policy: Reproduced under a Creative Commons License
• Data DOI: 10.5525/gla.researchdata.1211

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
303776		Light-controlled manufacturing of semiconductor structures: a platform for next generation processing of photonic devices	Peter Skabara	Engineering and Physical Sciences Research Council (EPSRC)	EP/P02744X/2	Chemistry
306772		MEGA	Peter Skabara	European Commission (EC)	823720	Chemistry