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 in | Journal of the American Chemical Society Vol. 140; no. 32; pp. 10198 - 10207 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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. |
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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 – name: Department of Chemistry – name: Materials Science and Engineering Program – name: University of Houston |
Author_xml | – sequence: 1 givenname: Po-Ni surname: Lai fullname: Lai, Po-Ni – sequence: 2 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 – sequence: 5 givenname: Thomas G surname: Gray fullname: Gray, Thomas G organization: Department of Chemistry – sequence: 6 givenname: Jiming orcidid: 0000-0002-6819-0117 surname: Bao fullname: Bao, Jiming – sequence: 7 givenname: Thomas S orcidid: 0000-0002-7471-8467 surname: Teets fullname: Teets, Thomas S email: tteets@uh.edu |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/30032607$$D View this record in MEDLINE/PubMed https://www.osti.gov/biblio/1539706$$D View this record in Osti.gov |
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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... Not provided. |
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StartPage | 10198 |
SubjectTerms | Chemistry Chemistry, Multidisciplinary iridium ligands light emitting diodes phosphorescence photoluminescence Physical Sciences Science & Technology |
Title | Highly Efficient Red-Emitting Bis-Cyclometalated Iridium Complexes |
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