Efficient Vacuum-Processed Light-Emitting Diodes Based on Carbene–Metal–Amides

Patrick J. Conaghan, S. Matthew Menke, Alexander S. Romanov, Saul T.E. Jones, Andrew J. Pearson, Emrys W. Evans, Manfred Bochmann, Neil C. Greenham, Dan Credgington

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

Efficient vacuum-processed organic light-emitting diodes are fabricated using a carbene–metal–amide material, CMA1. An electroluminescence (EL) external quantum efficiency of 23% is achieved in a host-free emissive layer comprising pure CMA1. Furthermore external quantum efficiencies of up to 26.9% are achieved in host–guest emissive layers. EL spectra are found to depend on both the emissive-layer doping concentration and the choice of host material, enabling tuning of emission color 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%) while maintaining a short radiative lifetime of triplets (
Original languageEnglish (US)
Pages (from-to)1802285
JournalAdvanced Materials
Volume30
Issue number35
DOIs
StatePublished - Jul 9 2018
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-09
Acknowledgements: This work was supported by the Engineering and Physical Sciences Research Council (EPSRC, grant no. EP/M005143/1) and the European Research Council (ERC). P.J.C. acknowledges EPSRC for Ph.D. studentship funding and A.J.P. also acknowledges support from EPSRC (grant no. EP/M024873/1). S.M.M. acknowledges support from the KAUST Competitive Research Grant Program. M.B. is an ERC Advanced Investigator Award holder (Grant No. 338944-GOCAT). D.C. acknowledges the support from the Royal Society (grant nos. UF130278 and RG140472). The authors thank the Diamond Light Source for access to the I07 beamline (session SI7223-1) and for the help during the GIWAXS experiments. The authors thank Mojtaba Abdi-Jalebi for PDS measurements and Edoardo Ruggeri for the help with GIWAXS measurements. The data underlying this publication is available through the following web link: https://doi.org/10.17863/CAM.24419.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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