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Efficient Phosphorescence from Naphthalenebenzimidizole-Coordinated Iridium(III) Chromophores

Journal Article · · European Journal of Inorganic Chemistry
 [1];  [2];  [2]
  1. North Carolina State Univ., Raleigh, NC (United States); NC State University
  2. North Carolina State Univ., Raleigh, NC (United States)
+ Show Author Affiliations
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 %.
Research Organization:
North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0011979
OSTI ID:
1633624
Alternate ID(s):
OSTI ID: 1379991
Journal Information:
European Journal of Inorganic Chemistry, Journal Name: European Journal of Inorganic Chemistry Journal Issue: 44 Vol. 2017; ISSN 1434-1948
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Recent Advancements in and the Future of Organic Emitters: TADF‐ and RTP‐Active Multifunctional Organic Materials journal August 2018

Figures / Tables (8)

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Related Subjects

14 SOLAR ENERGY
Iridium
Ligand effects
N ligands
Phosphorescence
Photophysics