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, 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: 06 May 2020 23:56
URI: https://ueaeprints.uea.ac.uk/id/eprint/67301
DOI: 10.1002/adma.201802285

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