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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3301
Title: Synthesis, characterization and electroluminescence of carbazole-benzimidazole hybrids with thiophene/phenyl linker
Authors: Karthik D.
Thomas K.R.J.
Jou J.-H.
Chen Y.-L.
Published in: Dyes and Pigments
Abstract: New organic luminescent materials containing carbazole and benzimidazole chromophores were synthesized by tethering them together using thiophene or phenyl spacer. Both 3,6- and 2,7-disubstitutions were explored. The functional properties of the new materials were analyzed by photophysical, electrochemical, thermal and electroluminescence properties. The thiophene containing dyes showed red-shifted absorption and emission profiles than that of the phenyl analogs due to effective electronic delocalization in the former. Also, the thiophene-based dyes exhibited low oxidation potentials than that of the phenyl analogs attributable to electron richness. Electroluminescence devices were fabricated using these dyes as emitting layer or dopant in a multi-layered configuration. The devices containing thiophene-based dyes showed relatively low turn-on voltage in the neat devices due to the favorable alignment of energy levels, which facilitated balanced charge transport. A thiophene-based dye exhibited better performance in the series with external quantum efficiency as high as 1.5%. © 2016 Elsevier Ltd.
Citation: Dyes and Pigments (2016), 133(): 132-142
URI: https://doi.org/10.1016/j.dyepig.2016.05.046
http://repository.iitr.ac.in/handle/123456789/3301
Issue Date: 2016
Publisher: Elsevier Ltd
Keywords: Benzimidazole
Carbazole
Electroluminescence
Organic dyes
Photophysical properties
Thiophene
ISSN: 1437208
Author Scopus IDs: 57195605812
57203389297
35083609400
56484852800
Author Affiliations: Karthik, D., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Thomas, K.R.J., Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Jou, J.-H., Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Chen, Y.-L., Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
Funding Details: Financial support from CSIR (Ref. No. 02/(0230)/15/EMR-II dated 05-06-2015), New Delhi to KRJT is gratefully acknowledged and DST for HRMS facility via FIST Program to the Chemistry Department. DK thanks UGC , New Delhi for research fellowship. Appendix A
Corresponding Author: Thomas, K.R.J.; Organic Materials Chemistry, Department of Chemistry, Indian Institute of Technology RoorkeeIndia; email: krjt8fcy@iitr.ac.in
Appears in Collections:Journal Publications [CY]

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