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Rationally Designed Blue Triplet Emitting Gold(III) Complexes Based on a Phenylpyridine-Derived Framework
Michael Bachmann1, Jasmin Terreni1, Olivier Blacque1
1Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zürich, Switzerland.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 12, 2017
Summary
Synthesized novel blue-emitting gold(III) complexes with tailored ligands for high-energy emission. These phosphorescent materials exhibit excellent quantum efficiencies and thermal stability, suitable for electronic devices.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Photophysics
Background:
- Development of efficient blue-emitting phosphorescent materials is crucial for advanced optoelectronic applications.
- Gold(III) complexes offer potential for high photoluminescence quantum yields and stability.
Purpose of the Study:
- To synthesize and characterize novel blue-emitting phosphorescent mono-cyclometalated gold(III) complexes.
- To investigate the effect of ligand substitution on photophysical properties and energy levels.
- To assess the suitability of these complexes for device fabrication.
Main Methods:
- Synthesis of mono-cyclometalated gold(III) complexes with substituted phenylpyridine ligands.
- Cyclic voltammetry to study redox properties and energy levels (HOMO/LUMO).
- Thermogravimetric analysis for thermal stability assessment.
- Photophysical measurements (emission spectra, quantum efficiency) in various media (solid, solution, films, low temperature).
Main Results:
- Successful synthesis of blue-emitting phosphorescent gold(III) complexes.
- Ligand functionalization with electron-withdrawing and donating groups tuned the energy gap, leading to high-energy emission.
- Complexes demonstrated high photoluminescent quantum efficiency (up to 28%) and good thermal stability (>280°C).
- Phosphorescence observed in solid-state, solution, PMMA films, and at 77 K in 2-MeTHF.
Conclusions:
- Tailored ligand design is effective in achieving high-energy blue emission and quantum efficiencies in gold(III) complexes.
- The synthesized gold(III) complexes exhibit promising properties for vacuum-deposited optoelectronic devices.
- Achieved the highest reported quantum yield for a blue-emitting gold(III) complex.
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