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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Labile or stable: can homoleptic and heteroleptic PyrPHOS-copper complexes be processed from solution?
Daniel Volz1, Manuela Wallesch, Stephan L Grage
1Institute of Organic Chemistry, Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany.
Copper(I) halide-PyrPHOS complexes show excellent stability for organic light-emitting diodes (OLEDs). These luminescent materials maintain their structure during solution processing and thin film formation, unlike other copper complexes.
Area of Science:
- Materials Science
- Chemistry
- Organic Electronics
Background:
- Luminescent copper(I) complexes are explored as dopants for organic light-emitting diodes (OLEDs).
- Concerns exist regarding the solution stability and processing suitability of these complexes.
- Emission properties of copper(I) emitters can change significantly between bulk and thin-film states due to processing.
Purpose of the Study:
- To evaluate the processing stability of novel copper-halide-(diphenylphosphino)pyridine (PyrPHOS) derivatives.
- To determine if these PyrPHOS complexes maintain structural integrity during solution processing and thin-film fabrication.
- To compare the behavior of single crystals, amorphous bulk samples, and neat thin films of these complexes.
Main Methods:
- Solid-state nuclear magnetic resonance (MAS (31)P NMR) to probe the phosphorus atom electronic environment.
- X-ray absorption spectroscopy at the Cu K edge to analyze the copper(I) center's local electronic and geometric structure.
- Comparative analysis of single crystals, amorphous bulk samples, and neat thin films.
Main Results:
- The copper-halide-PyrPHOS complexes demonstrated remarkable stability across different sample forms.
- No significant structural changes or decomposition were observed upon processing into thin films or during precipitation.
- MAS (31)P NMR and X-ray absorption spectroscopy confirmed the retention of the initial electronic and geometric structures.
Conclusions:
- Copper-halide-PyrPHOS clusters exhibit superior processing stability compared to other copper(I) complexes.
- These findings support the suitability of copper-halide-PyrPHOS derivatives for solution-processed OLED applications.
- The inherent stability of these complexes ensures consistent performance in thin-film devices.
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