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Title: Synthesis and characterization of multi-substituted carbazole derivatives exhibiting aggregation-induced emission for OLED applications
Authors: Sharma A.
Saklani D.
Justin Thomas, K. R.
Swayamprabha S.S.
Jou J.-H.
Published in: Organic Electronics
Abstract: A series of carbazole based derivatives differing in the number of dicyanovinyl acceptors and donors (N-alkyl carbazole or N-phenyl carbazole) are designed, synthesized and characterized. The effect of donors on optical, electrochemical and thermal properties of carbazole-dicyanovinyl dyads is critically analysed. The dyes containing C3-linked carbazole donor showed red-shifted absorption and larger molar extinction coefficients when compared to the dyes those containing N-phenylcarbazole attributable to the extended conjugation of C3-linked N-butylcarbazole. All the compounds showed positive solvatochromism in fluorescence attributable to intramolecular charge transfer in excited state. The higher thermal stability of the dyes suggests the rigidity of the carbazole derivatives. Interestingly, all the dyes containing N-phenylcarbazole showed aggregation-induced emission properties in THF-H O mixtures attributable to increased distortion in molecular configuration and restricted rotation in the solid state. Furthermore, a green OLED device fabricated with the dye containing N-butyl carbazole donor as dopant emitter (3%) in CBP host achieved good performance with high external quantum efficiency (4.2%), current efficiency (13.1 cd A ) and maximum brightness (L ) of 6180 cd m .
Citation: Organic Electronics(2020), 86
Issue Date: 2020
Publisher: Elsevier B.V.
Keywords: Aggregation-induced emission
Donor-acceptor compounds
Organic fluorescent materials
Organic light emitting diodes
Charge transfer
Excited states
Green manufacturing
Organic light emitting diodes (OLED)
Red Shift
Thermodynamic stability
Aggregation-induced emissions
Dicyanovinyl acceptors
External quantum efficiency
ISSN: 15661199
Author Scopus IDs: 57210795172
Author Affiliations: Sharma, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology, Roorkee, 247667, India
Saklani, D., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology, Roorkee, 247667, India
Funding Details: Science and Engineering Research Board, SERB: CRG/2018/003729 Bangladesh Council of Scientific and Industrial Research, BCSIR: 02(0371)/19/EMR-II.KRJT is thankful to Science and Engineering Research Board (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 Commissio
Corresponding Author: Justin Thomas, K.R.; Organic Materials Laboratory, India; email:
Appears in Collections:Journal Publications [CY]

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