Highly Efficient Luminescence of Cu(I) Compounds: Thermally Activated Delayed Fluorescence Combined with Short-Lived Phosphorescence
- 8 December 2014
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 137 (1), 399-404
- https://doi.org/10.1021/ja5109672
Abstract
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 T1 and singlet S1 state. At T = 300 K, these materials exhibit quantum yields of more than ΦPL = 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 spin–orbit 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.Keywords
Funding Information
- Bundesministerium für Bildung und Forschung
This publication has 49 references indexed in Scilit:
- Synthesis, Structure, and Characterization of Dinuclear Copper(I) Halide Complexes with P^N Ligands Featuring Exciting Photoluminescence PropertiesInorganic Chemistry, 2012
- Efficient luminescence from a copper(i) complex doped in organic light-emitting diodes by suppressing C–H vibrational quenchingChemical Communications, 2012
- Experimental and Theoretical Study of Novel Luminescent Di-, Tri-, and Tetranuclear Copper Triazole ComplexesOrganometallics, 2011
- A Codeposition Route to CuI−Pyridine Coordination Complexes for Organic Light-Emitting DiodesJournal of the American Chemical Society, 2011
- Recent Progresses on Materials for Electrophosphorescent Organic Light‐Emitting DevicesAdvanced Materials, 2010
- Photophysical Properties and OLED Applications of Phosphorescent Platinum(II) Schiff Base ComplexesChemistry – A European Journal, 2009
- Spectroscopy of the spin sublevels of transition metal complexesPublished by Springer Nature ,1997
- Characterization of triplet sublevels by Highly resolved vibrational satellite structures. Application to Pt(2-thpy)2The Journal of Physical Chemistry, 1995
- A new synthetic route to the preparation of a series of strong photoreducing agents: fac-tris-ortho-metalated complexes of iridium(III) with substituted 2-phenylpyridinesInorganic Chemistry, 1991
- Charge-transfer exited states of ruthenium(II) complexes. I. Quantum yield and decay measurementsJournal of the American Chemical Society, 1975