Wong, M. Y., Hedley, G. J. , Xie, G., Kölln, L. S., Samuel, I. D. W., Pertegás, A., Bolink, H. J. and Zysman-Colman, E. (2015) Light-emitting electrochemical cells and solution-processed organic light-emitting diodes using small molecule organic thermally activated delayed fluorescence emitters. Chemistry of Materials, 27(19), pp. 6535-6542. (doi: 10.1021/acs.chemmater.5b03245)
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Abstract
Two novel charged organic thermally activated delayed fluorescence (TADF) emitters, 1 and 2, have been synthesized. Their TADF behavior is well-supported by the multiexponential decay of their emission (nanosecond and microsecond components) and the oxygen dependence of the photoluminescence quantum yields. Spin-coated electroluminescent devices have been fabricated to make light-emitting electrochemical cells (LEECs) and organic light-emitting diodes (OLEDs). The first example of a non-doped charged small organic molecule LEEC is reported and exhibited an external quantum efficiency (EQE) of 0.39% using 2. With a multilayer architecture, a solution-processed OLED device using neat 2 as the emitting layer gave an EQE of 5.1%, the highest reported to date for a nondoped solution-processed small molecule organic TADF OLED. These promising results open up a new area in light-emitting materials for the development of low-cost TADF LEECs.
| Item Type: | Articles |
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| Additional Information: | E.Z.-C. thanks the University of St Andrews for support. We are grateful to the EPSRC for financial support (Grants EP/ J01771X and EP/J00916). I.D.W.S. is a Royal Society Wolfson Research Merit Award Holder. We thank the EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. This work has been supported by the Spanish Ministry of Economy and Competitiveness (MAT2014-55200 and FAFOR), and by the Generalitat Valenciana (Prometeo/2012/053). |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Hedley, Dr Gordon |
| Authors: | Wong, M. Y., Hedley, G. J., Xie, G., Kölln, L. S., Samuel, I. D. W., Pertegás, A., Bolink, H. J., and Zysman-Colman, E. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Chemistry of Materials |
| Publisher: | American Chemical Society |
| ISSN: | 0897-4756 |
| ISSN (Online): | 1520-5002 |
| Published Online: | 04 September 2015 |
| Copyright Holders: | Copyright © 2015 American Chemical Society |
| First Published: | First published in Chemistry of Materials 27:6535-6542 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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