22 September 2015 Reduced concentration quenching in a TADF-type copper(I)-emitter
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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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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