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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3349
Title: Pyrene-fluorene hybrids containing acetylene linkage as color-tunable emitting materials for organic light-emitting diodes
Authors: Justin Thomas, K. R.
Kapoor N.
Bolisetty M.N.K.P.
Jou J.-H.
Chen Y.-L.
Jou Y.-C.
Published in: Journal of Organic Chemistry
Abstract: New blue- to yellow-emitting materials have been developed by incorporating fluorene-based chromophores on pyrene core with acetylene linkage and using multifold palladium-catalyzed cross-coupling reactions. Both mono- and tetrasubstituted derivatives have been synthesized and characterized. The tetrasubstituted derivatives displayed red-shifted emission when compared to the monosubstituted derivative indicative of an extended conjugation in the former. End-capping with a diphenylamine unit further red-shifted the absorption and emission profiles and imparted a weak dipolar character to the molecules. Amine-containing derivatives displayed positive solvatochromism in the fluorescence spectra indicating a more polar excited state due to an efficient charge migration from the diphenylamine donor to the pyrene Ï€-acceptor. All of the derivatives were tested as emitting dopants with host material 4,4′-bis(9H-carbazol-9-yl)biphenyl (CBP) in a multilayered OLED and found to exhibit bright blue or yellow electroluminescence. The device utilizing 1,3,6,8-tetrasubstituted pyrene derivative as a dopant emitter displayed highest maximum luminescence 4630 cd/m 2 with power efficiency 3.8 lm/W and current efficiency 7.1 cd/A at 100 cd/m 2 attributable to the proper alignment of energy levels that led to the efficient harvesting of excitons. All of the devices exhibited color purity over a wide range of operating voltages. © 2012 American Chemical Society.
Citation: Journal of Organic Chemistry (2012), 77(8): 3921-3932
URI: https://doi.org/10.1021/jo300285v
http://repository.iitr.ac.in/handle/123456789/3349
Issue Date: 2012
ISSN: 223263
Author Scopus IDs: 57203389297
36705999100
55069391900
35083609400
56484852800
37097330600
Author Affiliations: Thomas, K.R.J., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Kapoor, N., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Bolisetty, M.N.K.P., Organic Materials Laboratory, 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
Jou, Y.-C., Department of Material Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
Corresponding Author: Thomas, K.R.J.; Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India; email: krjt8fcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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