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Narrow electroluminescence linewidths for reduced nonradiative recombination in organic solar cells and near-infrared light-emitting diodes

Journal Contribution - Journal Article

The minimization of nonradiative recombination losses is essential to transcend the efficiency of state-of-the-art organic solar cells (OSCs) and near- infrared (NIR) organic light- emitting diodes (OLEDs). Indeed, reduced nonradiative processes will result in high electroluminescence (EL), external quantum efficiency (EQE(EL)), and low nonradiative voltage losses (Delta V-OC,V- nr) for OSCs. Here, we study the EL properties of a set of polymer-small molecule blends and find a relationship between the EL emission linewidth, EQEEL, and Delta V-OC,V-nr. Based on these findings, we reduce Delta V-OC,V-nr from the typical values around 250 mV down to an unprecedented value of 155 mV using a blend comprising a low- molecular-weight PM6 polymer donor and a highly emissive nonfullerene acceptor (Y16F). Importantly, the PM6:Y16F blend yields an EQE(EL) ( 0.52%) among the best reported fluorescent NIR-OLEDs in the 900-nm range. These findings clearly indicate the existence of organic material blends that combine both excellent photovoltaic and electroluminescent properties.
Journal: Joule
ISSN: 2542-4351
Issue: 9
Volume: 5
Pages: 2365 - 2379
Publication year:2021
BOF-keylabel:yes
IOF-keylabel:yes
BOF-publication weight:10
Authors from:Government, Higher Education, Private
Accessibility:Open