Thermally Activated Delayed Fluorescence in a Y3N@C80 Endohedral Fullerene: Time‐Resolved Luminescence and EPR Studies |
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| Authors: | Dr Michal Zalibera Denis S Krylov Dimitrios Karagiannis Paul‐Anton Will Frank Ziegs Sandra Schiemenz Prof?Dr Wolfgang Lubitz Prof?Dr Sebastian Reineke Dr Anton Savitsky Dr Alexey A Popov |
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| Institution: | 1. Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany;2. Institute of Physical Chemistry and Chemical Physics, Slovak University of Technology, Bratislava, Slovakia;3. Leibniz Institute for Solid State and Materials Research, Dresden, Germany;4. Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics (IAP), TU Dresden, Dresden, Germany |
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| Abstract: | The endohedral fullerene Y3N@C80 exhibits luminescence with reasonable quantum yield and extraordinary long lifetime. By variable‐temperature steady‐state and time‐resolved luminescence spectroscopy, it is demonstrated that above 60 K the Y3N@C80 exhibits thermally activated delayed fluorescence with maximum emission at 120 K and a negligible prompt fluorescence. Below 60 K, a phosphorescence with a lifetime of 192±1 ms is observed. Spin distribution and dynamics in the triplet excited state is investigated with X‐ and W‐band EPR and ENDOR spectroscopies and DFT computations. Finally, electroluminescence of the Y3N@C80/PFO film is demonstrated opening the possibility for red‐emitting fullerene‐based organic light‐emitting diodes (OLEDs). |
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| Keywords: | delayed fluorescence endohedral fullerenes EPR/ENDOR luminescence OLEDs |
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