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Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells

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Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells. / Hierlinger, Claus; Trzop, Elzbieta; Toupet, Loic; Avila, Jorge; La-Placa, Maria-Grazia; Bolink, Henk J.; Guerchais, Veronique; Zysman-Colman, Eli.

In: Journal of Materials Chemistry C, Vol. 6, No. 24, 28.06.2018, p. 6385-6397.

Research output: Contribution to journalReview article

Harvard

Hierlinger, C, Trzop, E, Toupet, L, Avila, J, La-Placa, M-G, Bolink, HJ, Guerchais, V & Zysman-Colman, E 2018, 'Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells', Journal of Materials Chemistry C, vol. 6, no. 24, pp. 6385-6397. https://doi.org/10.1039/C8TC01130C

APA

Hierlinger, C., Trzop, E., Toupet, L., Avila, J., La-Placa, M-G., Bolink, H. J., Guerchais, V., & Zysman-Colman, E. (2018). Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells. Journal of Materials Chemistry C, 6(24), 6385-6397. https://doi.org/10.1039/C8TC01130C

Vancouver

Hierlinger C, Trzop E, Toupet L, Avila J, La-Placa M-G, Bolink HJ et al. Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells. Journal of Materials Chemistry C. 2018 Jun 28;6(24):6385-6397. https://doi.org/10.1039/C8TC01130C

Author

Hierlinger, Claus ; Trzop, Elzbieta ; Toupet, Loic ; Avila, Jorge ; La-Placa, Maria-Grazia ; Bolink, Henk J. ; Guerchais, Veronique ; Zysman-Colman, Eli. / Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells. In: Journal of Materials Chemistry C. 2018 ; Vol. 6, No. 24. pp. 6385-6397.

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@article{62ed5b58057f416b973cb7bd9cd8fb9a,
title = "Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells",
abstract = "The synthesis, structural and optoelectronic characterization of a family of sterically congested cyclometalated cationic Ir(III) complexes of the form [Ir(C^N)2(dtBubpy)]PF6 (with dtBubpy = 4,4ʹ-di-tert-butyl-2,2ʹ-bipyridine and C^N = a cyclometalating ligand decorated at the 4-position of the pyridine ring and/or the 3-position of the phenyl ring with a range of sterically bulky substituents) are reported. This family of complexes is compared to the unsubstituted analogue complex R1 bearing 2-phenylpyridinato as cyclometalating ligand. The impact of the use the sterics on the C^N ligands on both the solid state photophysics and light-emitting electrochemical cell (LEEC) device performance is investigated. X-ray diffraction analysis of complexes 1a, R2, 2a, and 1b show an increasing internuclear distance in the solid state, within these four complexes. Emission studies in solution and neat film show that the chosen substituents essentially do not impact the emission energy. The photoluminescence quantum yields (ΦPL) are in the same range (ΦPL ~ 25 – 31%), except for 1b, which shows a lower ΦPL of 12%. All complexes exhibit similar monoexponential emission lifetimes in the submicrosecond regime. LEECs based on R1, 1a, 1b and R2 were fabricated, showing yellow luminescence and moderate efficiencies and lifetimes. The arguably best performing LEEC device, showing the highest luminance (737 cd m-2), current efficiency (7.4 cd A-1) and EQE (2.6%), employed emitter 1a.",
author = "Claus Hierlinger and Elzbieta Trzop and Loic Toupet and Jorge Avila and Maria-Grazia La-Placa and Bolink, {Henk J.} and Veronique Guerchais and Eli Zysman-Colman",
note = "We thank Umicore AG for the gift of materials. We thank the EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. C.H. acknowledges the R{\'e}gion Bretagne, France for funding. E.Z.-C. acknowledges the University of St Andrews and EPSRC (EP/M02105X/1) for financial support.",
year = "2018",
month = jun,
day = "28",
doi = "10.1039/C8TC01130C",
language = "English",
volume = "6",
pages = "6385--6397",
journal = "Journal of Materials Chemistry C",
issn = "2050-7526",
publisher = "ROYAL SOC CHEMISTRY",
number = "24",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Impact of the use of sterically congested Ir(III) complexes on the performance of light-emitting electrochemical cells

AU - Hierlinger, Claus

AU - Trzop, Elzbieta

AU - Toupet, Loic

AU - Avila, Jorge

AU - La-Placa, Maria-Grazia

AU - Bolink, Henk J.

AU - Guerchais, Veronique

AU - Zysman-Colman, Eli

N1 - We thank Umicore AG for the gift of materials. We thank the EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. C.H. acknowledges the Région Bretagne, France for funding. E.Z.-C. acknowledges the University of St Andrews and EPSRC (EP/M02105X/1) for financial support.

PY - 2018/6/28

Y1 - 2018/6/28

N2 - The synthesis, structural and optoelectronic characterization of a family of sterically congested cyclometalated cationic Ir(III) complexes of the form [Ir(C^N)2(dtBubpy)]PF6 (with dtBubpy = 4,4ʹ-di-tert-butyl-2,2ʹ-bipyridine and C^N = a cyclometalating ligand decorated at the 4-position of the pyridine ring and/or the 3-position of the phenyl ring with a range of sterically bulky substituents) are reported. This family of complexes is compared to the unsubstituted analogue complex R1 bearing 2-phenylpyridinato as cyclometalating ligand. The impact of the use the sterics on the C^N ligands on both the solid state photophysics and light-emitting electrochemical cell (LEEC) device performance is investigated. X-ray diffraction analysis of complexes 1a, R2, 2a, and 1b show an increasing internuclear distance in the solid state, within these four complexes. Emission studies in solution and neat film show that the chosen substituents essentially do not impact the emission energy. The photoluminescence quantum yields (ΦPL) are in the same range (ΦPL ~ 25 – 31%), except for 1b, which shows a lower ΦPL of 12%. All complexes exhibit similar monoexponential emission lifetimes in the submicrosecond regime. LEECs based on R1, 1a, 1b and R2 were fabricated, showing yellow luminescence and moderate efficiencies and lifetimes. The arguably best performing LEEC device, showing the highest luminance (737 cd m-2), current efficiency (7.4 cd A-1) and EQE (2.6%), employed emitter 1a.

AB - The synthesis, structural and optoelectronic characterization of a family of sterically congested cyclometalated cationic Ir(III) complexes of the form [Ir(C^N)2(dtBubpy)]PF6 (with dtBubpy = 4,4ʹ-di-tert-butyl-2,2ʹ-bipyridine and C^N = a cyclometalating ligand decorated at the 4-position of the pyridine ring and/or the 3-position of the phenyl ring with a range of sterically bulky substituents) are reported. This family of complexes is compared to the unsubstituted analogue complex R1 bearing 2-phenylpyridinato as cyclometalating ligand. The impact of the use the sterics on the C^N ligands on both the solid state photophysics and light-emitting electrochemical cell (LEEC) device performance is investigated. X-ray diffraction analysis of complexes 1a, R2, 2a, and 1b show an increasing internuclear distance in the solid state, within these four complexes. Emission studies in solution and neat film show that the chosen substituents essentially do not impact the emission energy. The photoluminescence quantum yields (ΦPL) are in the same range (ΦPL ~ 25 – 31%), except for 1b, which shows a lower ΦPL of 12%. All complexes exhibit similar monoexponential emission lifetimes in the submicrosecond regime. LEECs based on R1, 1a, 1b and R2 were fabricated, showing yellow luminescence and moderate efficiencies and lifetimes. The arguably best performing LEEC device, showing the highest luminance (737 cd m-2), current efficiency (7.4 cd A-1) and EQE (2.6%), employed emitter 1a.

U2 - 10.1039/C8TC01130C

DO - 10.1039/C8TC01130C

M3 - Review article

VL - 6

SP - 6385

EP - 6397

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

SN - 2050-7526

IS - 24

ER -

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