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Title: Efficient Phosphorescence from Naphthalenebenzimidizole-Coordinated Iridium(III) Chromophores

Abstract

The electronic structure and photophysical properties of two phosphorescent iridium(III) cyclometalated complexes are introduced. The molecules were synthesized by cyclometalating the ligand 1,8-naphthalenebenzimidizole (NBI ), to an iridium(III) metal center. Two NBI ligands were covalently attached along with a 1,10-phenanthroline (phen) ligand producing the [Ir(NBI )2(phen)](PF6) complex and three NBI ligands were used to prepare the corresponding tris -cyclometalate fac -Ir(NBI )3. The optical properties of these new IrIII molecules were investigated using DFT calculations, photoluminescence spectroscopy, and transient absorption spectroscopy. The molecules at the heart of this study were discovered to contain long-lived ligand-localized triplet excited states on the NBI species, featuring energies suitable for bimolecular photochemical reactions. Both iridium(III) chromophores possess excellent light absorptivity in the visible region of the spectrum with high photoluminescence quantum efficiencies approaching 30 %.

Authors:
 [1];  [1]; ORCiD logo [1]
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  1. North Carolina State Univ., Raleigh, NC (United States)
Publication Date:
Research Org.:
North Carolina State University, Raleigh, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1633624
Alternate Identifier(s):
OSTI ID: 1379991
Grant/Contract Number:  
SC0011979; CHE‐1359377
Resource Type:
Accepted Manuscript
Journal Name:
European Journal of Inorganic Chemistry
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 44; Journal ID: ISSN 1434-1948
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; Phosphorescence; Iridium; N ligands; Ligand effects; Photophysics

Citation Formats

Yarnell, James E., De La Torre, Patricia, and Castellano, Felix N. Efficient Phosphorescence from Naphthalenebenzimidizole-Coordinated Iridium(III) Chromophores. United States: N. p., 2017. Web. doi:10.1002/ejic.201700669.
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Yarnell, James E., De La Torre, Patricia, & Castellano, Felix N. Efficient Phosphorescence from Naphthalenebenzimidizole-Coordinated Iridium(III) Chromophores. United States. https://doi.org/10.1002/ejic.201700669
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Yarnell, James E., De La Torre, Patricia, and Castellano, Felix N. Fri . "Efficient Phosphorescence from Naphthalenebenzimidizole-Coordinated Iridium(III) Chromophores". United States. https://doi.org/10.1002/ejic.201700669. https://www.osti.gov/servlets/purl/1633624.
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@article{osti_1633624,
title = {Efficient Phosphorescence from Naphthalenebenzimidizole-Coordinated Iridium(III) Chromophores},
author = {Yarnell, James E. and De La Torre, Patricia and Castellano, Felix N.},
abstractNote = {The electronic structure and photophysical properties of two phosphorescent iridium(III) cyclometalated complexes are introduced. The molecules were synthesized by cyclometalating the ligand 1,8-naphthalenebenzimidizole (NBI ), to an iridium(III) metal center. Two NBI ligands were covalently attached along with a 1,10-phenanthroline (phen) ligand producing the [Ir(NBI )2(phen)](PF6) complex and three NBI ligands were used to prepare the corresponding tris -cyclometalate fac -Ir(NBI )3. The optical properties of these new IrIII molecules were investigated using DFT calculations, photoluminescence spectroscopy, and transient absorption spectroscopy. The molecules at the heart of this study were discovered to contain long-lived ligand-localized triplet excited states on the NBI species, featuring energies suitable for bimolecular photochemical reactions. Both iridium(III) chromophores possess excellent light absorptivity in the visible region of the spectrum with high photoluminescence quantum efficiencies approaching 30 %.},
doi = {10.1002/ejic.201700669},
journal = {European Journal of Inorganic Chemistry},
number = 44,
volume = 2017,
place = {United States},
year = {Fri Aug 11 00:00:00 EDT 2017},
month = {Fri Aug 11 00:00:00 EDT 2017}
}
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https://doi.org/10.1002/ejic.201700669
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Scheme 1 Scheme 1: Synthesis of the chromophores.
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    Recent Advancements in and the Future of Organic Emitters: TADF‐ and RTP‐Active Multifunctional Organic Materials
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    • Chemistry – An Asian Journal, Vol. 14, Issue 10
    • DOI: 10.1002/asia.201801791
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