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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3294
Title: Fine-Tuning of Photophysical and Electroluminescence Properties of Benzothiadiazole-Based Emitters by Methyl Substitution
Authors: Pathak A.
Justin Thomas, K. R.
Singh M.
Jou J.-H.
Published in: Journal of Organic Chemistry
Abstract: New benzothiadiazole-based materials containing methyl substitution are prepared and characterized as promising green/yellowish green emitters for electroluminescent applications. The dyes exhibited shorter wavelength absorption and emission when compared to nonmethylated dyes. A dye containing methyl group on the donor side exhibited blue shift in absorption and emission when compared to the analogous dye containing methyl group away from donor. The steric effect exerted by the methyl group is responsible for the nonplanar arrangement of donor and acceptor, which inhibited the intramolecular charge transfer. All the dyes displayed solvatochromism in the emission spectra characteristic of hybridization of local and charge transfer excited states. Due to the benefit of methyl group, the dyes restrained the formation of aggregates in the solid state. Solution processed multilayered OLED device were fabricated employing these compounds either as host emitters or dopant emitters in suitable host matrix and exhibited green/yellowish green electroluminescence with external quantum efficiency as high as 4.6% (15.7 cd A-1). © 2017 American Chemical Society.
Citation: Journal of Organic Chemistry (2017), 82(21): 11512-11523
URI: https://doi.org/10.1021/acs.joc.7b02127
http://repository.iitr.ac.in/handle/123456789/3294
Issue Date: 2017
Publisher: American Chemical Society
ISSN: 223263
Author Scopus IDs: 57196374416
57203389297
57203297295
35083609400
Author Affiliations: Pathak, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Justin Thomas, K.R., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Singh, M., 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: K.R.J.T. is thankful to CSIR (ref. No. 02/(0230)/15/EMR-II dated 05-06-2015), New Delhi, for financial support. We also acknowledge DST for the setup of ESI mass spectrometer via the FIST grant to the Chemistry Department, IIT Roorkee. A.P. is grateful for research fellowship from Ministry of Human Resources and Development (MHRD), Government of India
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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