Efficient near-infrared emission of π-extended cyclometalated iridium complexes based on pyrene in solution-processed polymer light-emitting diode
| Autor: | Yu Liu, Liang Yang, Pu Wang, Shi-Jian Su, Fanyuan Meng, Yafei Wang, Yong Pei, Zhaoran Hao |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Dopant Ligand Near-infrared spectroscopy General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Electroluminescence 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Triphenylamine 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Pyrene Quantum efficiency Iridium Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Chemical Physics Letters. 699:99-106 |
| ISSN: | 0009-2614 |
| DOI: | 10.1016/j.cplett.2018.03.046 |
| Popis: | A novel iridium complex grafting hole-transporting triphenylamine (TPA) unit onto cyclometalated ligand, namely t-BuPyrPyTPA) 2 Ir(acac), was successfully synthesized and characterized. The photophysical, electrochemical and DFT/TD-DFT calculation, as well as electroluminescence properties of this iridium complex were fully investigated. Meanwhile, the PLEDs employing (t-BuPyrPyTPA) 2 Ir(acac) as dopant presented stable NIR emission peaked at 697 nm and a shoulder at 764 nm with a highest external quantum efficiency ( EQE ) of 0.56% at 4 wt% dopant concentration. These results demonstrate that expanding the conjugation length of the ligand is an effective way to achieve NIR emission. |
| Databáze: | OpenAIRE |
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