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Photophysical and Electroluminescence Characteristics of Polyfluorene Derivatives with Triphenylamine

1
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
2
Faculty of Engineering, Multimedia University, Persiaran Multimedia, Cyberjaya 63100, Malaysia
3
Department of Physics, University of Malaya, Lembah Pantai, Kuala Lumpur 50603, Malaysia
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(5), 840; https://doi.org/10.3390/polym11050840
Received: 7 March 2019 / Revised: 27 March 2019 / Accepted: 30 March 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Polymers for Electronic Applications)
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Abstract

In this work, polymers of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-triphenylamine] with side chains containing: pyrene (C1), diphenyl (C2), naphthalene (C3), and isopropyl (C6) structures were synthesized via a Suzuki coupling reaction. The structures were verified using NMR and cyclic voltammetry measurements provide the HOMO and LUMO of the polymers. The polymer with pyrene (C1) and naphthalene (C3) produced photoluminescence in the green while the polymer with the side chain containing diphenyl (C2) and isopropyl (C6) produce dual emission peaks of blue-green photoluminescence (PL). In order to examine the electroluminescence properties of the polymers, the solutions were spin-coated onto patterned ITO anode, dried, and subsequently coated with an Al cathode layer to form pristine single layer polymer LEDs. The results are compared to a standard PFO sample. The electroluminescence spectra resemble the PL spectra for C1 and C3. The devices of C2, C3, and C6 exhibit voltage-dependent EL. An additional red emission peak was detected for C2 and C6, resulting in spectra with peaks at 435 nm, 490 nm, and 625 nm. The effects of the side chains on the spectral characteristics of the polymer are discussed. View Full-Text
Keywords: semiconducting polymer; electroluminescence; polyfluorene; triphenylamine; PLED; Suzuki coupling; OLED semiconducting polymer; electroluminescence; polyfluorene; triphenylamine; PLED; Suzuki coupling; OLED
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhang, Q.; Wang, P.-I.; Ong, G.L.; Tan, S.H.; Tan, Z.W.; Hii, Y.H.; Wong, Y.L.; Cheah, K.S.; Yap, S.L.; Ong, T.S.; Tou, T.Y.; Nee, C.H.; Liaw, D.J.; Yap, S.S. Photophysical and Electroluminescence Characteristics of Polyfluorene Derivatives with Triphenylamine. Polymers 2019, 11, 840.

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