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, Harald Flügge, Alexander Rohr, Alexander Rohr, Sebastian Döring, Sebastian Döring, Charlotte Fléchon, Charlotte Fléchon, Manuela Wallesch, Manuela Wallesch, Daniel Zink, Daniel Zink, Jochen Seeser, Jochen Seeser, Jaime Leganés, Jaime Leganés, Tatjana Sauer, Tatjana Sauer, Torsten Rabe, Torsten Rabe, Wolfgang Kowalsky, Wolfgang Kowalsky, Thomas Baumann, Thomas Baumann, Daniel Volz, 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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