Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 86: Organic electronics and photovoltaics V (CPP, jointly with HL, O)
HL 86.9: Vortrag
Donnerstag, 14. März 2013, 17:30–17:45, H34
Strongly Fluorescent Copper Complexes for Application in OLEDs Using the Singlet-Harvesting Effect — •Rafal Czerwieniec and Hartmut Yersin — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, D-93040, Germany.
A series of strongly luminescent Cu(I) complexes is presented. The emissions cover a broad spectral range from the blue to the orange. The ambient temperature quantum yields are as high as 90 % and the decay times lie in the order of several microseconds. From a detailed analysis of the photophysical behavior, the ambient temperature emission is assigned to a thermally activated delayed fluorescence (TADF). This is in contrast to the situation at low temperatures, e.g. below 100 K, at which the emission stems from the lowest triplet state decaying as long-lived phosphorescence (order of several hundred microseconds). The observed photophysical properties are related to small energy separations between the S1 (singlet) and T1 (triplet) excited states. The results demonstrate the high potential for application of these materials as OLED emitters by exploiting the recently reported singlet harvesting mechanism.
Literature:
1. R. Czerwieniec, J. Yu, H. Yersin, Inorg. Chem., 2011, 50, 8293-8301.
2. H. Yersin, A. F. Rausch, R. Czerwieniec, T. Hofbeck, T. Fischer, Coord. Chem. Rev., 2011, 255, 2622-2652.