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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3288
Title: Tetra-substituted Dipolar Carbazoles: Tuning Optical and Electroluminescence Properties by Linkage Variation
Authors: Joseph V.
Justin Thomas, K. R.
Yang W.Y.
Kumar Yadav R.A.
Kumar Dubey D.
Jou J.-H.
Published in: Asian Journal of Organic Chemistry
Abstract: Six isomeric carbazole derivatives featuring donors such as triphenylamine and carbazole and cyano acceptor are synthesized and characterized. Triphenylamine substituted compounds displayed longer wavelength absorption and emission and improved thermal stability when compared to their carbazole congeners. The compounds containing donors at 2,7-position of carbazole core displayed negative solvatochromism in absorption while the other isomers showed solvent independent absorption profiles. Except the dye containing carbazole at 1,8-positions, all the dyes exhibited solvatochromism in excited state. Within a series dyes containing donors at 1,8-positions exhibited shorter wavelength absorption and emission due to the significant twisting of chromophores at 1,8-positions. The dyes possessing donor at 2,7-positions and cyano groups at 3,6-positions showed best electroluminescence performance (external quantum efficiency, 4.1 %) in the series owing to their ability to utilize triplet excitons via hybridized local and charge transfer excited state. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation: Asian Journal of Organic Chemistry (2018), 7(8): 1654-1666
URI: https://doi.org/10.1002/ajoc.201800248
http://repository.iitr.ac.in/handle/123456789/3288
Issue Date: 2018
Publisher: Wiley-VCH Verlag
Keywords: blue emission
carbazole
donor–acceptor
solvatochromism
turn-on voltage
ISSN: 21935807
Author Scopus IDs: 57198421158
57203389297
57203372123
57203005559
57196260177
35083609400
Author Affiliations: Joseph, V., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Justin Thomas, K.R., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Yang, W.Y., Department of Materials science and engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Kumar Yadav, R.A., Department of Materials science and engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Kumar Dubey, D., Department of Materials science and engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Jou, J.-H., Department of Materials science and engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Funding Details: KRJT is thankful to CSIR (Ref. 02/(0230)/15/EMR-II), New Delhi, for financial support.
Corresponding Author: Justin Thomas, K.R.; Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology RoorkeeIndia; email: krjt8fcy@iitr.ac.in
Appears in Collections:Journal Publications [CY]

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