22 September 2015 Reduced concentration quenching in a TADF-type copper(I)-emitter
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Abstract
Phosphorescent OLEDs are now being used in first commercial products, mainly in displays. Typically, such devices operate at low-to-moderate brightnes s (<500 cd m-2), while it would be beneficial for actual lighting applications to also reach a very high luminance. However, a phenomenon called efficiency roll-off contradicts this aim. The reducing of the device efficiency with rising triplet exciton concentration due to triplet-triplet annihilation (TTA) is the most relevant factor causing roll-off for such compounds. Photophysically, this is reflected by strong concentration quenching in concentrated samples of phosphorescent materials. We present a potential solution for this issue. In this article we identify a copper(I) emitter showing thermally-activated delayed fluorescence (TADF) that seems to be much more immune to concentration quenching than conventional phosphorescent materials, even though triplet states are also populated in a similar manner.
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Harald Flügge, Alexander Rohr, Sebastian Döring, Charlotte Fléchon, Manuela Wallesch, Daniel Zink, Jochen Seeser, Jaime Leganés, Tatjana Sauer, Torsten Rabe, Wolfgang Kowalsky, Thomas Baumann, Daniel Volz, "Reduced concentration quenching in a TADF-type copper(I)-emitter", Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 95661P (22 September 2015); doi: 10.1117/12.2185935; https://doi.org/10.1117/12.2185935
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