Journal
CHEMICAL PHYSICS LETTERS
Volume 699, Issue -, Pages 99-106Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2018.03.046
Keywords
Near-infrared emission; Iridium (III) complex; Pyrene; Electroluminescence; Polymer light-emitting diodes
Funding
- National Natural Science Foundation of China [51473140, 51273168]
- Hunan Natural Science Foundation [2015JJ2139]
- Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization
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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. (C) 2018 Elsevier B.V. All rights reserved.
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