Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 17, Pages 6499-6505Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b04894
Keywords
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Funding
- Natural Science Foundation of China [21334002, 51521002, 51403063]
- Ministry of Science and Technology of China [2013CB834705, 2015CB655003]
- Fundamental Research Funds for the Central Universities [2015ZP001, 2015ZM042]
- Introduced Innovative R&D Team of Guangdong [201101C0105067115]
- Major Science and Technology Project of Guangdong Province [201SB090913002]
- Foundation of Guangzhou Science and Technology Project [201504010012]
- China Postdoctoral Science Fund [2014M562174]
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Restricted by the energy gap rule, near-infrared (NIR) luminescent materials face great challenges. Here, we report a newly designed and synthesized organic molecule, 5,5'-([1,2,5]thiadiazolo[3,4-c]pyridine-4,7-diyl)bis(N,N-diphenylthiophen-2-amine) (DTPS-PT), which has strong donor and acceptor interactions for NIR emission applications. The results demonstrate that the higher planarity of the DTPS-PT molecular structure enhances the pi-conjugation and hybridization between the charge transfer state (CT) and localized pi states (LE). As a result, DTPS-PT exhibits NIR emissions from an LE involved in hybridized local and charge transfer (HLCT) states, showing a 79% high fluorescence quantum yield in the low polar solvent tetrachloromethane. For both doped and nondoped devices, the NIR OLEDs based on DTPS-PT achieved real NIR emission with the lambda(onset) above 700 nm. The best performing OLED device within the doped devices gave a maximum emission peak around 840 nm with a maximum radiance of 2202 mW Sr-1 m(-2).
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