Highly Efficient Red-Emitting Bis-Cyclometalated Iridium Complexes

Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N,N′-diisopropylbenzamidinat...

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Published inJournal of the American Chemical Society Vol. 140; no. 32; pp. 10198 - 10207
Main Authors Lai, Po-Ni, Brysacz, Caroline H, Alam, Md Kamrul, Ayoub, Nicholas A, Gray, Thomas G, Bao, Jiming, Teets, Thomas S
Format Journal Article
LanguageEnglish
Published WASHINGTON American Chemical Society 15.08.2018
Amer Chemical Soc
American Chemical Society (ACS)
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Abstract Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N,N′-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (ΦPL) for red-emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant (k r) is significantly higher than that of related complexes, and contributes substantially to the increase in ΦPL. Experimental and computational evidence is consistent with the notion that an increase in spin–orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light-emitting diode device.
AbstractList Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly pi-donating, nitrogen-containing beta-ketoiminate (acNac), beta-diketiminate (NacNac), and N,N'-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (Phi(PL)) for red emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant (k(r)) is significantly higher than that of related complexes, and contributes substantially to the increase in O-PL. Experimental and computational evidence is consistent with the notion that an increase in spin-orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light -emitting diode device.
Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N, N'-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (Φ ) for red-emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant ( k ) is significantly higher than that of related complexes, and contributes substantially to the increase in Φ . Experimental and computational evidence is consistent with the notion that an increase in spin-orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light-emitting diode device.
Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N,N′-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (ΦPL) for red-emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant (k r) is significantly higher than that of related complexes, and contributes substantially to the increase in ΦPL. Experimental and computational evidence is consistent with the notion that an increase in spin–orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light-emitting diode device.
Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N, N'-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (ΦPL) for red-emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant ( kr) is significantly higher than that of related complexes, and contributes substantially to the increase in ΦPL. Experimental and computational evidence is consistent with the notion that an increase in spin-orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light-emitting diode device.Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N, N'-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (ΦPL) for red-emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant ( kr) is significantly higher than that of related complexes, and contributes substantially to the increase in ΦPL. Experimental and computational evidence is consistent with the notion that an increase in spin-orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light-emitting diode device.
Not provided.
Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate that incorporating strongly π-donating, nitrogen-containing β-ketoiminate (acNac), β-diketiminate (NacNac), and N,N′-diisopropylbenzamidinate (dipba) ancillary ligands can demonstrably perturb the excited-state kinetics, leading to enhanced photoluminescence quantum yields (ΦPL) for red-emitting compounds. A comprehensive study of the quantum yields and lifetimes for these complexes reveals that for the compounds with the highest quantum yields, the radiative rate constant (kᵣ) is significantly higher than that of related complexes, and contributes substantially to the increase in ΦPL. Experimental and computational evidence is consistent with the notion that an increase in spin–orbit coupling, caused by an enhancement of the metal-to-ligand charge transfer (MLCT) character of the excited state via destabilization of the HOMO, is mainly responsible for the faster radiative rates. One of the compounds was shown to be effective as the emissive dopant in an organic light-emitting diode device.
Author Gray, Thomas G
Teets, Thomas S
Alam, Md Kamrul
Brysacz, Caroline H
Ayoub, Nicholas A
Bao, Jiming
Lai, Po-Ni
AuthorAffiliation Department of Chemistry
Department of Electrical and Computer Engineering
Materials Science and Engineering Program
University of Houston
AuthorAffiliation_xml – name: Department of Electrical and Computer Engineering
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– name: Materials Science and Engineering Program
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  givenname: Caroline H
  surname: Brysacz
  fullname: Brysacz, Caroline H
– sequence: 3
  givenname: Md Kamrul
  surname: Alam
  fullname: Alam, Md Kamrul
– sequence: 4
  givenname: Nicholas A
  orcidid: 0000-0002-4354-7722
  surname: Ayoub
  fullname: Ayoub, Nicholas A
  organization: Department of Chemistry
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  givenname: Thomas G
  surname: Gray
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  email: tteets@uh.edu
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https://www.osti.gov/biblio/1539706$$D View this record in Osti.gov
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Issue 32
Keywords IR(III) COMPLEXES
BETA-KETOIMINATE
PHOSPHORESCENT
TEMPERATURE-DEPENDENCE
QUANTUM YIELDS
OLED APPLICATIONS
ORGANOMETALLIC COMPLEXES
TRIPLET EMITTERS
DEVICES
EXCITED-STATES
Language English
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  article-title: High-efficiency orange to near-infrared emissions from bis-cyclometalated iridium complexes with phenyl-benzoquinoline isomers as ligands
  publication-title: JOURNAL OF MATERIALS CHEMISTRY
  doi: 10.1039/b906675f
– volume: 40
  start-page: 1704
  year: 2001
  ident: WOS:000167588300042
  article-title: Synthesis and characterization of phosphorescent cyclometalated iridium complexes
  publication-title: INORGANIC CHEMISTRY
SSID ssj0004281
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Snippet Bis-cyclometalated iridium complexes with enhanced phosphorescence quantum yields in the red region of the visible spectrum are described. Here, we demonstrate...
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SubjectTerms Chemistry
Chemistry, Multidisciplinary
iridium
ligands
light emitting diodes
phosphorescence
photoluminescence
Physical Sciences
Science & Technology
Title Highly Efficient Red-Emitting Bis-Cyclometalated Iridium Complexes
URI http://dx.doi.org/10.1021/jacs.8b04841
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Summon&SrcAuth=ProQuest&DestApp=WOS&DestLinkType=FullRecord&UT=000442183700025
https://www.ncbi.nlm.nih.gov/pubmed/30032607
https://www.proquest.com/docview/2074121643
https://www.proquest.com/docview/2116880519
https://www.osti.gov/biblio/1539706
Volume 140
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