Issue 38, 2022

Insights into the degradation mechanism of carbene–metal–amide organic light-emitting diodes

Abstract

Organic light-emitting diodes (OLEDs) based on carbene–metal–amide (CMA) material are fabricated to investigate the fundamental processes that drive degradation in operational CMA OLEDs. The device lifetime of CMA OLEDs decreases rapidly with increased applied current density and implies a bimolecular degradation process. Photo- and electrical degradation studies of unipolar devices show that neither holes nor electrons are involved, and degradation is only driven by excitons. Probing of the recombination zone rationalises the degradation rate in OLEDs. We observe that the rate increases with the square of the exciton density and conclude that the degradation in CMA OLEDs is primarily driven by exciton–exciton annihilation.

Graphical abstract: Insights into the degradation mechanism of carbene–metal–amide organic light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
01 Jun 2022
Accepted
30 Aug 2022
First published
05 Sep 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2022,10, 14180-14185

Insights into the degradation mechanism of carbene–metal–amide organic light-emitting diodes

C. S. B. Matthews, A. S. Romanov and N. C. Greenham, J. Mater. Chem. C, 2022, 10, 14180 DOI: 10.1039/D2TC02288E

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