Blue Emissive fac/mer-Iridium (III) NHC Carbene Complexes and their Application in OLEDs

Muazzam Idris; Savannah C. Kapper; Abegail C. Tadle; Thilini Batagoda; Daniel Sylvinson Muthiah Ravinson; Opeoluwa Abimbola; Peter I. Djurovich; Jongchan Kim; Caleb Coburn; Stephen R. Forrest; Mark E. Thompson

doi:10.1002/adom.202001994

Blue Emissive fac/mer-Iridium (III) NHC Carbene Complexes and their Application in OLEDs

Muazzam Idris, Savannah C. Kapper, Abegail C. Tadle, Thilini Batagoda, Daniel Sylvinson Muthiah Ravinson, Opeoluwa Abimbola, Peter I. Djurovich, Jongchan Kim, Caleb Coburn, Stephen R. Forrest, Mark E. Thompson

Department of Integrated Display Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The photophysical and electrochemical properties of N-heterocyclic carbene complexes of Iridium (III) (Ir(C^{^}C:)₃, where C^{^}C: = N-phenyl,N-methyl-pyrazinoimidazol-2-yl (pmpz), N,N-di-p-tolyl-pyrazinoimidazol-2-yl (tpz)) are reported. Facial and meridional isomers of Ir(pmpz)₃ are prepared, but only the facial isomer can be isolated for Ir(tpz)₃. The fac-Ir(pmpz)₃ and fac-Ir(tpz)₃ complexes have emission maxima at 465 nm in polystyrene, whereas the emission maximum of mer-Ir(pmpz)₃ is redshifted to 495 nm. The emission energies and photoluminescent quantum yield (Φ_PL) in solution decrease on going from nonpolar to polar solvents; however, all the complexes are efficient emitters in polystyrene at room temperature (Φ_PL = 88–96%) and 77 K. Blue phosphorescent organic light emitting diodes employing fac-Ir(tpz)₃ as an emissive dopant achieves a high external electroluminescence efficiency (≈18 ± 1%) and brightness (29 000 cd m⁻²) at low current density.

Original language	English
Article number	2001994
Journal	Advanced Optical Materials
Volume	9
Issue number	8
DOIs	https://doi.org/10.1002/adom.202001994
Publication status	Published - 2021 Apr 20

Bibliographical note

Funding Information:
M.I. and S.C.K. contributed equally to this work. The authors would like to acknowledge the Universal Display Corporation for funding of this work. Also, S.R.F. thanks the Air Force Office of Scientific Research (Award No. FA9550‐18‐1‐0162) for its partial support of this study.

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

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10.1002/adom.202001994

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@article{c01953eed5c74407926d35c292b04e67,

title = "Blue Emissive fac/mer-Iridium (III) NHC Carbene Complexes and their Application in OLEDs",

abstract = "The photophysical and electrochemical properties of N-heterocyclic carbene complexes of Iridium (III) (Ir(C^C:)3, where C^C: = N-phenyl,N-methyl-pyrazinoimidazol-2-yl (pmpz), N,N-di-p-tolyl-pyrazinoimidazol-2-yl (tpz)) are reported. Facial and meridional isomers of Ir(pmpz)3 are prepared, but only the facial isomer can be isolated for Ir(tpz)3. The fac-Ir(pmpz)3 and fac-Ir(tpz)3 complexes have emission maxima at 465 nm in polystyrene, whereas the emission maximum of mer-Ir(pmpz)3 is redshifted to 495 nm. The emission energies and photoluminescent quantum yield (ΦPL) in solution decrease on going from nonpolar to polar solvents; however, all the complexes are efficient emitters in polystyrene at room temperature (ΦPL = 88–96%) and 77 K. Blue phosphorescent organic light emitting diodes employing fac-Ir(tpz)3 as an emissive dopant achieves a high external electroluminescence efficiency (≈18 ± 1%) and brightness (29 000 cd m−2) at low current density.",

author = "Muazzam Idris and Kapper, {Savannah C.} and Tadle, {Abegail C.} and Thilini Batagoda and {Muthiah Ravinson}, {Daniel Sylvinson} and Opeoluwa Abimbola and Djurovich, {Peter I.} and Jongchan Kim and Caleb Coburn and Forrest, {Stephen R.} and Thompson, {Mark E.}",

note = "Funding Information: M.I. and S.C.K. contributed equally to this work. The authors would like to acknowledge the Universal Display Corporation for funding of this work. Also, S.R.F. thanks the Air Force Office of Scientific Research (Award No. FA9550‐18‐1‐0162) for its partial support of this study. Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",

year = "2021",

month = apr,

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doi = "10.1002/adom.202001994",

language = "English",

volume = "9",

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T1 - Blue Emissive fac/mer-Iridium (III) NHC Carbene Complexes and their Application in OLEDs

AU - Idris, Muazzam

AU - Kapper, Savannah C.

AU - Tadle, Abegail C.

AU - Batagoda, Thilini

AU - Muthiah Ravinson, Daniel Sylvinson

AU - Abimbola, Opeoluwa

AU - Djurovich, Peter I.

AU - Kim, Jongchan

AU - Coburn, Caleb

AU - Forrest, Stephen R.

AU - Thompson, Mark E.

N1 - Funding Information: M.I. and S.C.K. contributed equally to this work. The authors would like to acknowledge the Universal Display Corporation for funding of this work. Also, S.R.F. thanks the Air Force Office of Scientific Research (Award No. FA9550‐18‐1‐0162) for its partial support of this study. Publisher Copyright: © 2021 Wiley-VCH GmbH

PY - 2021/4/20

Y1 - 2021/4/20

N2 - The photophysical and electrochemical properties of N-heterocyclic carbene complexes of Iridium (III) (Ir(C^C:)3, where C^C: = N-phenyl,N-methyl-pyrazinoimidazol-2-yl (pmpz), N,N-di-p-tolyl-pyrazinoimidazol-2-yl (tpz)) are reported. Facial and meridional isomers of Ir(pmpz)3 are prepared, but only the facial isomer can be isolated for Ir(tpz)3. The fac-Ir(pmpz)3 and fac-Ir(tpz)3 complexes have emission maxima at 465 nm in polystyrene, whereas the emission maximum of mer-Ir(pmpz)3 is redshifted to 495 nm. The emission energies and photoluminescent quantum yield (ΦPL) in solution decrease on going from nonpolar to polar solvents; however, all the complexes are efficient emitters in polystyrene at room temperature (ΦPL = 88–96%) and 77 K. Blue phosphorescent organic light emitting diodes employing fac-Ir(tpz)3 as an emissive dopant achieves a high external electroluminescence efficiency (≈18 ± 1%) and brightness (29 000 cd m−2) at low current density.

AB - The photophysical and electrochemical properties of N-heterocyclic carbene complexes of Iridium (III) (Ir(C^C:)3, where C^C: = N-phenyl,N-methyl-pyrazinoimidazol-2-yl (pmpz), N,N-di-p-tolyl-pyrazinoimidazol-2-yl (tpz)) are reported. Facial and meridional isomers of Ir(pmpz)3 are prepared, but only the facial isomer can be isolated for Ir(tpz)3. The fac-Ir(pmpz)3 and fac-Ir(tpz)3 complexes have emission maxima at 465 nm in polystyrene, whereas the emission maximum of mer-Ir(pmpz)3 is redshifted to 495 nm. The emission energies and photoluminescent quantum yield (ΦPL) in solution decrease on going from nonpolar to polar solvents; however, all the complexes are efficient emitters in polystyrene at room temperature (ΦPL = 88–96%) and 77 K. Blue phosphorescent organic light emitting diodes employing fac-Ir(tpz)3 as an emissive dopant achieves a high external electroluminescence efficiency (≈18 ± 1%) and brightness (29 000 cd m−2) at low current density.

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DO - 10.1002/adom.202001994

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JO - Advanced Optical Materials

JF - Advanced Optical Materials

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M1 - 2001994

ER -

Blue Emissive fac/mer-Iridium (III) NHC Carbene Complexes and their Application in OLEDs

Abstract

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