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Three Types of Charged Ligands Based Carboxyl-Containing Iridium(III) Complexes: Structures, Photophysics, and
Qiuxia Li1, Chao Shi1, Manli Huang2
1School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, People's Republic of China.
Inorganic Chemistry
|November 5, 2021
Summary
Researchers synthesized novel charged iridium(III) complexes for phosphorescent applications. One complex, Ir1, demonstrated good solubility and moderate efficiency in solution-processed OLEDs, paving the way for new luminescent materials.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Photochemistry
Background:
- Phosphorescent iridium(III) complexes are crucial for organic light-emitting diodes (OLEDs).
- Tuning ligand charge and structure influences photophysical properties and device performance.
Purpose of the Study:
- To synthesize and characterize a new family of charged phosphorescent iridium(III) complexes.
- To investigate the effect of ligand charge on structural, photophysical, and electronic properties.
- To evaluate the performance of a selected complex in solution-processed OLEDs.
Main Methods:
- Synthesis of four iridium(III) complexes with varying charged ligands (0, -1, -2).
- Single-crystal X-ray diffraction for structural analysis.
- Density Functional Theory (DFT) calculations for electronic structure.
- Fabrication and testing of solution-processed OLED devices.
Main Results:
- Three neutral complexes (Ir1, Ir2, Ir3) exhibited a trans-N^N configuration, while the cationic complex (Ir4) showed a trans-N^C configuration with hydrogen bonding.
- Complex Ir4 displayed higher luminescence efficiency and a blue-shifted emission compared to Ir1, Ir2, and Ir3.
- DFT calculations revealed distinct ligand-to-ligand charge transfer (LLCT) characteristics between neutral and cationic complexes.
- Complex Ir1 achieved moderate OLED efficiency (6.6%) with orange emission in solution-processed devices.
Conclusions:
- A novel strategy for constructing charged phosphorescent iridium(III) complexes was developed.
- Ligand charge significantly impacts the structure, excited-state properties, and charge transfer pathways.
- The synthesized complexes offer potential for advanced luminescent materials and OLED applications.
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