Sommer, Gereon A. and Mataranga-Popa, Larisa N. and Czerwieniec, Rafal and Hofbeck, Thomas and Homeier, Herbert H. H. and Mueller, Thomas J. J. and Yersin, Hartmut (2018) Design of Conformationally Distorted Donor-Acceptor Dyads Showing Efficient Thermally Activated Delayed Fluorescence. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9 (13). pp. 3692-3697. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
A highly potent donor-acceptor biaryl thermally activated delayed fluorescence (TADF) dye is accessible by a concise two-step sequence employing two-fold Ullmann arylation and a sequentially Pd-catalyzed Masuda borylation-Suzuki arylation (MBSA). Photophysical investigations show efficient TADF at ambient temperature due to the sterical hindrance between the donor and acceptor moieties. The photoluminescence quantum yield amounts to Phi(PL) = 80% in toluene and 90% in PMMA arising from prompt and delayed fluorescence with decay times of 21 ns and 30 mu s, respectively. From an Arrhenius plot, the energy gap Delta E(S-1 - T-1) between the lowest excited singlet S(1 )and triplet T-1 state was determined to be 980 cm(-1) (120 meV). A new procedure is proposed that allows us to estimate the intersystem crossing time to similar to 10(2) ns.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMITTING-DIODES; ONE-POT SYNTHESIS; CU(I) COMPLEXES; EMITTERS; BORYLATION; EMISSION; PERFORMANCE; MECHANISM; SEQUENCE; IR(III); |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Hartmut Yersin |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Mar 2020 07:10 |
| Last Modified: | 06 Apr 2020 05:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14255 |
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