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

DOI: 10.1002/adma.201802285 DOI Help

Authors: Patrick J. Conaghan (University of Cambridge) , S. Matthew Menke (University of Cambridge) , Alexander S. Romanov (University of East Anglia) , Saul T. E. Jones (University of Cambridge) , Andrew J. Pearson (University of Sheffield) , Emrys W. Evans (University of Cambridge) , Manfred Bochmann (University of East Anglia) , Neil C. Greenham (University of Cambridge) , Dan Credgington (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Materials , VOL 51

State: Published (Approved)
Published: July 2018
Diamond Proposal Number(s): 7223

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 (<1 μs).

Journal Keywords: carbene–metal–amide; host-free; organic light-emitting diodes; thermally activated delayed fluorescence; vacuum-processed

Subject Areas: Materials, Physics

Instruments: I07-Surface & interface diffraction