Efficient vacuum-processed light-emitting diodes based on carbene-metal-amides

Conaghan, Patrick J., Menke, S. Matthew, Romanov, Alexander S., Jones, Saul T. E., Pearson, Andrew J., Evans, Emrys W., Bochmann, Manfred ORCID: https://orcid.org/0000-0001-7736-5428, Greenham, Neil C. and Credgington, Dan (2018) Efficient vacuum-processed light-emitting diodes based on carbene-metal-amides. Advanced Materials, 30 (35). ISSN 0935-9648

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Abstract

Efficient vacuum-processed organic light-emitting diodes (OLEDs) have been fabricated using the carbene-metal-amide material CMA1. Electroluminescence external quantum efficiencies of greater than 24 % have been achieved with host-guest emissive layers utilizing a 1,3-bis(N-carbazolyl)benzene (mCP) host as well as in host-free emissive layers comprising pure CMA1. Furthermore, an external quantum efficiency greater than 26 % has been achieved by substitution of the emissive layer host for a symmetrical, non-polar variant. Electroluminescence spectra are found to depend on both emissive layer doping concentration and the choice of host material, enabling tuning of emission colour from mid-green (Commission Internationale de l’Éclairage co-ordinates [0.24, 0.46]) to sky blue ([0.22 0.35]) without changing dopant. This tuning is achieved without compromising luminescence efficiency (> 80 %) and maintaining a short radiative lifetime of triplets (< 1 µs).

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Depositing User: Pure Connector
Date Deposited: 05 Jun 2018 14:30
Last Modified: 21 Oct 2022 18:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/67301
DOI: 10.1002/adma.201802285

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