Hofbeck, Thomas and Monkowius, Uwe and Yersin, Hartmut (2015) Highly Efficient Luminescence of Cu(I) Compounds: Thermally Activated Delayed Fluorescence Combined with Short-Lived Phosphorescence. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 137 (1). pp. 399-404. ISSN 0002-7863,
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Luminescent materials showing thermally activated delayed fluorescence (TADF) have gained high attractiveness as emitters in organic light emitting diodes (OLEDs) and other photonic applications. Nevertheless, even utilization of TADF can be further improved, introducing a novel concept. This is demonstrated by a new class of brightly luminescent low-cost Cu(I) compounds, for which the emission stems from both the lowest excited triplet T-1 and singlet S1 state. At T = 300 K, these materials exhibit quantum yields of more than Phi(PL) = 90% at short emission decay times. About 80% of the emission intensity stems from the singlet due to TADF, but importantly, an additional 20% is contributed by the lower lying triplet state according to effective spinorbit coupling (SOC). SOC induces also a relatively large zero-field splitting of the triplet being unusual for Cu(I) complexes. Thus, the overall emission decay time is distinctly reduced. Combined use of both decay paths opens novel photonic applications, in particular, for OLEDs.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMITTING-DIODES; TRANSFER EXCITED-STATES; RUTHENIUM(II) COMPLEXES; OLED APPLICATIONS; TRIPLET EMITTERS; BLUE; SINGLET; EMISSION; DEVICES; ELECTROPHOSPHORESCENCE; |
| 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: | 25 Jul 2019 11:57 |
| Last Modified: | 25 Jul 2019 11:57 |
| URI: | https://pred.uni-regensburg.de/id/eprint/6104 |
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