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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3285
Title: Cyano-functionalized carbazole substituted pyrene derivatives for promising organic light-emitting diodes
Authors: Joseph V.
Thomas K.R.J.
Sahoo S.
Singh M.
Jou J.-H.
Published in: Dyes and Pigments
Abstract: Balanced charge transport is crucial to realize efficient organic light-emitting diodes. In this work, pyrene derivatives featuring variable number of cyano-functionalized carbazoles are synthesized and characterized by photophysical, electrochemical, thermal and electroluminescence studies. The compounds displayed progressive variation in absorption and emission wavelength reflecting the effect of chromophore loading. The electroluminescence color change from deep blue to green on varying the number/position of cyanocarbazole units on pyrene. 1,6-Disubstituted derivative exhibited blue shift in absorption and emission when compared to the 1,8-analog. The current efficiency and power efficiency of the devices progressively increase on increasing the cyanocarbazole load on pyrene. It is probably originating from the balanced charge transport due to the increase in the number of cyanocarbazole units on pyrene and effective harvest of excitons in emissive layer. The best electroluminescence performance of the doped device fabricated from tetra-substituted derivative (1 wt%) displayed relatively high power efficiency (5.8 lm/W) and current efficiency (9.2 cd/A). © 2018 Elsevier Ltd
Citation: Dyes and Pigments (2018), 158(): 295-305
URI: https://doi.org/10.1016/j.dyepig.2018.05.038
http://repository.iitr.ac.in/handle/123456789/3285
Issue Date: 2018
Publisher: Elsevier Ltd
Keywords: Carbazole
Organic electronics
Organic light emitting diodes
Photophysical properties
Pyrene
Structure-property relationship
ISSN: 1437208
Author Scopus IDs: 57198421158
57203389297
56982461100
57203297295
35083609400
Author Affiliations: Joseph, V., 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
Sahoo, S., Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, 30013, Taiwan
Singh, M., 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. Financial support from DST for the purchase of ESI mass spectrometer is also acknowledged. Appendix A
Corresponding Author: Thomas, K.R.J.; 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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