A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells

Sebastian B. Meier; Wiebke Sarfert; José M. Junquera-Hernández; Manuel Delgado; Daniel Tordera; Enrique Ortí; Henk J. Bolink; Florian Kessler; Rosario Scopelliti; Michael Grätzel; M. Khaja Nazeeruddin; Etienne Baranoff

doi:10.1039/c2tc00251e

A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells

Sebastian B. Meier, Wiebke Sarfert^*, José M. Junquera-Hernández, Manuel Delgado, Daniel Tordera, Enrique Ortí, Henk J. Bolink, Florian Kessler, Rosario Scopelliti, Michael Grätzel, M. Khaja Nazeeruddin, Etienne Baranoff

^*Corresponding author for this work

Chemistry

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Abstract

We report here a new cationic bis-cyclometallated iridium(iii) complex, 1, with deep-blue emission at 440 nm and its use in Light-emitting Electrochemical Cells (LECs). The design is based on the 2′,6′-difluoro-2,3′- bipyridine skeleton as the cyclometallating ligand and a bis-imidazolium carbene-type ancillary ligand. Furthermore, bulky tert-butyl substituents are used to limit the intermolecular interactions. LECs have been driven both at constant voltage (6 V) and constant current (2.5 mA cm^-2). The performances are significantly improved with the latter method, resulting overall in one of the best reported greenish-blue LECs having fast response (17 s), light intensity over 100 cd m^-2 and a reasonable efficiency of almost 5 cd A^-1.

Original language	English
Pages (from-to)	58-68
Number of pages	11
Journal	Journal of Materials Chemistry C
Volume	1
Issue number	1
DOIs	https://doi.org/10.1039/c2tc00251e
Publication status	Published - 7 Jan 2013

ASJC Scopus subject areas

Chemistry(all)
Materials Chemistry

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Meier, S. B., Sarfert, W., Junquera-Hernández, J. M., Delgado, M., Tordera, D., Ortí, E., Bolink, H. J., Kessler, F., Scopelliti, R., Grätzel, M., Nazeeruddin, M. K., & Baranoff, E. (2013). A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells. Journal of Materials Chemistry C, 1(1), 58-68. https://doi.org/10.1039/c2tc00251e

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title = "A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells",

abstract = "We report here a new cationic bis-cyclometallated iridium(iii) complex, 1, with deep-blue emission at 440 nm and its use in Light-emitting Electrochemical Cells (LECs). The design is based on the 2′,6′-difluoro-2,3′- bipyridine skeleton as the cyclometallating ligand and a bis-imidazolium carbene-type ancillary ligand. Furthermore, bulky tert-butyl substituents are used to limit the intermolecular interactions. LECs have been driven both at constant voltage (6 V) and constant current (2.5 mA cm-2). The performances are significantly improved with the latter method, resulting overall in one of the best reported greenish-blue LECs having fast response (17 s), light intensity over 100 cd m-2 and a reasonable efficiency of almost 5 cd A-1.",

author = "Meier, {Sebastian B.} and Wiebke Sarfert and Junquera-Hern{\'a}ndez, {Jos{\'e} M.} and Manuel Delgado and Daniel Tordera and Enrique Ort{\'i} and Bolink, {Henk J.} and Florian Kessler and Rosario Scopelliti and Michael Gr{\"a}tzel and Nazeeruddin, {M. Khaja} and Etienne Baranoff",

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Meier, SB, Sarfert, W, Junquera-Hernández, JM, Delgado, M, Tordera, D, Ortí, E, Bolink, HJ, Kessler, F, Scopelliti, R, Grätzel, M, Nazeeruddin, MK & Baranoff, E 2013, 'A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells', Journal of Materials Chemistry C, vol. 1, no. 1, pp. 58-68. https://doi.org/10.1039/c2tc00251e

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T1 - A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells

AU - Meier, Sebastian B.

AU - Sarfert, Wiebke

AU - Junquera-Hernández, José M.

AU - Delgado, Manuel

AU - Tordera, Daniel

AU - Ortí, Enrique

AU - Bolink, Henk J.

AU - Kessler, Florian

AU - Scopelliti, Rosario

AU - Grätzel, Michael

AU - Nazeeruddin, M. Khaja

AU - Baranoff, Etienne

PY - 2013/1/7

Y1 - 2013/1/7

N2 - We report here a new cationic bis-cyclometallated iridium(iii) complex, 1, with deep-blue emission at 440 nm and its use in Light-emitting Electrochemical Cells (LECs). The design is based on the 2′,6′-difluoro-2,3′- bipyridine skeleton as the cyclometallating ligand and a bis-imidazolium carbene-type ancillary ligand. Furthermore, bulky tert-butyl substituents are used to limit the intermolecular interactions. LECs have been driven both at constant voltage (6 V) and constant current (2.5 mA cm-2). The performances are significantly improved with the latter method, resulting overall in one of the best reported greenish-blue LECs having fast response (17 s), light intensity over 100 cd m-2 and a reasonable efficiency of almost 5 cd A-1.

AB - We report here a new cationic bis-cyclometallated iridium(iii) complex, 1, with deep-blue emission at 440 nm and its use in Light-emitting Electrochemical Cells (LECs). The design is based on the 2′,6′-difluoro-2,3′- bipyridine skeleton as the cyclometallating ligand and a bis-imidazolium carbene-type ancillary ligand. Furthermore, bulky tert-butyl substituents are used to limit the intermolecular interactions. LECs have been driven both at constant voltage (6 V) and constant current (2.5 mA cm-2). The performances are significantly improved with the latter method, resulting overall in one of the best reported greenish-blue LECs having fast response (17 s), light intensity over 100 cd m-2 and a reasonable efficiency of almost 5 cd A-1.

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A deep-blue emitting charged bis-cyclometallated iridium(iii) complex for light-emitting electrochemical cells

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