Emission and color tuning of cyanostilbenes and white light emission

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dc.contributor.author Kumari, Beena
dc.contributor.author Paramasivam, Mahalingavelar
dc.contributor.author Dutta, Arnab
dc.contributor.author Kanvah, Sriram
dc.date.accessioned 2019-01-02T09:42:08Z
dc.date.available 2019-01-02T09:42:08Z
dc.date.issued 2018-12
dc.identifier.citation Kumari, Beena; Paramasivam, Mahalingavelar; Dutta, Arnab and Kanvah, Sriram, "Emission and color tuning of cyanostilbenes and white light emission", ACS Omega, DOI: 10.1021/acsomega.8b02775, vol. 3, no. 12, pp. 17376-17385, Dec. 2018. en_US
dc.identifier.issn 2470-1343
dc.identifier.issn 2470-1343
dc.identifier.uri https://doi.org/10.1021/acsomega.8b02775
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/4055
dc.description.abstract White-light-emitting diodes are energy efficiency replacement of conventional lighting sources. Herein, we report the luminescent behavior of three simple cyanostilbenes with triphenylamine-donating groups bearing different electron-withdrawing groups (phenyl, pyridyl, and p-nitrophenyl) in a common donor (D)−π–acceptor (A) α-cyanostilbene construct along with their thermal and electrochemical properties. The density functional theory (DFT) studies reveal that aggregation-induced emission characteristic feature of the D−π–A dyes is inversely proportional to the intramolecular charge transfer (ICT) effect, that is, phenyl-and pyridyl-substituted compounds show characteristic aggregation-induced emission in water, whereas the ICT effect is dominant for the nitro derivative. The extent of ICT and the solvatochromic emission shifts, from blue to red, depend on the strength of the electron-withdrawing group. White luminescence and tunable emission colors are obtained by careful admixtures of these cyanostilbenes bearing triphenylamines. The results rationalized through DFT and time-dependent DFT calculations follow a consistent trend with the energy levels measured from the electrochemical and optical studies. Thermogravimetric analysis and differential scanning calorimetry studies showed excellent thermal stability of the compounds. The scanning electron microscopy and dynamic light scattering measurements were performed to reveal the formation of aggregates. This strategy involving synthetically simple and structurally similar molecules with different emission properties has potential applications in the fabrication of multicolor and white-light-emitting materials.
dc.description.statementofresponsibility by Beena Kumari, Mahalingavelar Paramasivam, Arnab Dutta and Sriram Kanvah
dc.format.extent vol. 3, no. 12, pp. 17376-17385
dc.language.iso en en_US
dc.publisher American Chemical Society(ACS) en_US
dc.subject Color conversion en_US
dc.subject Cyanostilbene en_US
dc.subject Photoisomerization en_US
dc.subject Quantum dots en_US
dc.subject White-light emission en_US
dc.title Emission and color tuning of cyanostilbenes and white light emission en_US
dc.type Article en_US
dc.relation.journal ACS Omega

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