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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3282
Title: Polarity tuning of fluorene derivatives by chromophores to achieve efficient blue electroluminescent materials
Authors: Justin Thomas, K. R.
Venkateswararao A.
Joseph V.
Kumar S.
Jou J.-H.
Published in: Organic Electronics
Abstract: Highly efficient deep-blue organic light-emitting diode is indispensable to fabricate energy efficient high quality displays and solid-state lightings. In this report, we report a series of fluorene-based emitters, which exhibit tunable polarity dependent on the choice of chromophore. The absorption and emission spectra of the compounds are highly dependent on the nature of chromophore and its contribution to the conjugation or donor-acceptor interaction. The solvatochromism of the dyes in the fluorescence is indicative of the realization of polar excited state, which is dependent on the donor strength of chromophore. Similarly, the oxidation potentials of the dyes are reminiscent of the electron-richness of the chromophores. The dyes are thermally robust comparable to the prominent electroluminescent materials and possess thermal decomposition temperatures greater than 340 °C which increases with the conjugation. The OLED device containing an emitter derived from triphenylamine showed a maximum power efficiency of 5.6 lm/W, maximum external quantum efficiency of 4.2%, and maximum luminance of 4150 cd/m2 with Commission Internationale de l'Eclairage (CIE) coordinates of (0.15, 0.11). The work demonstrates the use of simple chromophores to achieve efficient electroluminescent materials. © 2018 Elsevier B.V.
Citation: Organic Electronics (2019), 64(): 266-273
URI: https://doi.org/10.1016/j.orgel.2018.10.029
http://repository.iitr.ac.in/handle/123456789/3282
Issue Date: 2019
Publisher: Elsevier B.V.
Keywords: Blue emitters
Donor-acceptor compounds
Electroluminescence
Fluorene
Organic light emitting diodes
Organic materials
ISSN: 15661199
Author Scopus IDs: 57203389297
37051266500
57198421158
57209547997
35083609400
Author Affiliations: Justin Thomas, K.R., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India
Venkateswararao, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India
Joseph, V., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India
Kumar, S., 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 Council of Scientific and Industrial Research (Ref. 02/(0230)/15/EMR-II ), New Delhi, for financial support. Appendix A
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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