Zalibera M, Krylov DS, Karagiannis D, Will P, Ziegs F, Schiemenz S, Lubitz W, Reineke S, Savitsky A, Popov AA. Thermally Activated Delayed Fluorescence in a Y
3 N@C
80 Endohedral Fullerene: Time-Resolved Luminescence and EPR Studies.
Angew Chem Int Ed Engl 2018;
57:277-281. [PMID:
29119650 PMCID:
PMC5751888 DOI:
10.1002/anie.201710637]
[Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Indexed: 12/25/2022]
Abstract
The endohedral fullerene Y3 N@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 Y3 N@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 Y3 N@C80 /PFO film is demonstrated opening the possibility for red-emitting fullerene-based organic light-emitting diodes (OLEDs).
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