Butterfly-Shaped Thiophene-Pyridine Hybrids: Green Electroluminescence and Large Third-Order Optical Nonlinearities.

Autor: Kakekochi V; Organic and Materials Chemistry Laboratory Department of Chemistry, National Institute of Technology Karnataka Srinivasnagar, 575025, Mangaluru, India., Gangadharappa SC; Organic and Materials Chemistry Laboratory Department of Chemistry, National Institute of Technology Karnataka Srinivasnagar, 575025, Mangaluru, India., Nikhil PP; Laser and Nonlinear Optics Laboratory Department of Physics, National Institute of Technology Calicut Kozhikode, 673601, Kerala, India., Chandrasekharan K; Laser and Nonlinear Optics Laboratory Department of Physics, National Institute of Technology Calicut Kozhikode, 673601, Kerala, India., Darshan V; Photosciences and Photonics Section Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram, Kerala, 695019, India., Narayanan Unni KN; Photosciences and Photonics Section Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram, Kerala, 695019, India., Dalimba UK; Organic and Materials Chemistry Laboratory Department of Chemistry, National Institute of Technology Karnataka Srinivasnagar, 575025, Mangaluru, India.
Jazyk: angličtina
Zdroj: ChemPlusChem [Chempluschem] 2020 Aug; Vol. 85 (8), pp. 1762-1777.
DOI: 10.1002/cplu.202000435
Abstrakt: A set of four symmetric, butterfly-shaped 4-(4-(decyloxy)phenyl)-2,6-di(thiophen-2-yl)pyridine (TPY) derivatives 2TPA-TPY (TPY center and triphenylamine end groups), 2CBZ-TPY (TPY center and N-ethyl carbazole end groups), 2TPY-TPA (triphenylamine center and TPY at the periphery) and 2TPY-CBZ (N-ethyl carbazole center and TPY at the periphery) was synthesized. The molecules show reverse saturable absorption (RSA) which is consistent with two-photon absorption (2PA) associated with excited-state absorption (ESA) when excited using a 532 nm laser beam. The molecules 2TPA-TPY and 2TPY-TPA possess extremely low limiting thresholds of 1.73 and 2.68 J cm -2 , respectively. An organic light-emitting diode (OLED) fabricated from 2TPA-TPY exhibits green emission with a maximum luminance of 207 cd m -2 , a current efficiency (η CE ) of 1.51cd A -1 , a maximum power efficiency (η Pmax ) of 0.46 lm W -1 and an external quantum efficiency (η EQE ) of 0.48 % at 100 cd m -2 .
(© 2020 Wiley-VCH GmbH.)
Databáze: MEDLINE
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