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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/20836
Title: Tuning photophysical and electroluminescent properties of phenanthroimidazole decorated carbazoles with donor and acceptor units: Beneficial role of cyano substitution
Authors: Sharma A.
Balasaravanan R.
Justin Thomas, K. R.
Ram M.
Dubey D.K.
Yadav R.A.K.
Jou J.-H.
Published in: Dyes and Pigments
Abstract: Four new multi-functionalized carbazole derivatives featuring phenanthroimidazole, N-phenylcarbazole and cyano-substituents are designed and synthesized. The dyes are characterized by photophysical, electrochemical and thermal properties and the dependency of auxiliary chromophores on the functional properties critically analyzed. The dyes showed tunable emission from violet to blue region depending on the chromophore attached to the carbazole core. The cyano-substituted dyes exhibited enhanced intramolecular charge transfer in optical properties as compared to N-phenylcarbazole substituted dyes. Consequently, cyano-substituted dyes displayed solvatochromism in emission and possess large Stokes shift. All the dyes showed remarkable thermal stability attributable to robust phenanthroimidazole and carbazole chromophores. The fluorescent sensory properties of all the dyes toward acid are also explored and found that the emission of cyano derivatives displayed blue shift due to protonation of phenanthroimidazole unit. Finally, the dyes are employed as dopant emitter in multilayer solution-processed organic light-emitting diode which displayed blue electroluminescence. © 2020 Elsevier Ltd
Citation: Dyes and Pigments, 184
URI: https://doi.org/10.1016/j.dyepig.2020.108830
http://repository.iitr.ac.in/handle/123456789/20836
Issue Date: 2021
Publisher: Elsevier Ltd
Keywords: Acidochromism
Aggregation-induced emission (AIE)
Carbazole
Charge transfer transition
Organic-light emitting diodes (OLEDs)
phenanthro[9,10-d]imidazole
ISSN: 1437208
Author Scopus IDs: 57210795172
56113107000
57203389297
57222808125
57193009616
57200389832
35083609400
Author Affiliations: Sharma, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee, 247667, India
Balasaravanan, R., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee, 247667, India
Thomas, K.R.J., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee, 247667, India
Ram, M., Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Dubey, D.K., Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Yadav, R.A.K., Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Jou, J.-H., Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Funding Details: KRJT is thankful to SERB, New Delhi ( CRG/2018/003729 ) and Council of Scientific and Industrial Research (CSIR), New Delhi ( 02(0371)/19/EMR-II ) for financial support. AS is grateful to University Grant Commission (UGC ), Government of India for research fellowship. Council of Scientific and Industrial Research, India, CSIR: 02(0371)/19/EMR-II; University Grants Commission, UGC; Science and Engineering Research Board, SERB: CRG/2018/003729
Corresponding Author: Thomas, K.R.J.; Organic Materials Laboratory, India; email: krjt@cy.iitr.ac.in
Appears in Collections:Journal Publications [CY]

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