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Deep‐Red Phosphorescent Iridium(III) Complexes with Chromophoric N‐Heterocyclic Carbene Ligands: Design, Photophysical Properties, and DFT Calculations
Author(s) -
Lanoë PierreHenri,
Chan Jonny,
Gontard Geoffrey,
Monti Filippo,
Armaroli Nicola,
Barbieri Andrea,
Amouri Hani
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600140
Subject(s) - phosphorescence , chemistry , carbene , iridium , photochemistry , chromophore , moiety , ligand (biochemistry) , excited state , phosphorescent organic light emitting diode , triplet state , molecule , fluorescence , stereochemistry , organic chemistry , catalysis , physics , quantum mechanics , biochemistry , receptor , nuclear physics
The synthesis of three deep‐red‐emitting iridium(III) complexes featuring a naphthalimide N‐heterocyclic carbene ligand was investigated. The introduction of this organic chromophore onto the carbene moiety changed the character of the lowest excited state from triplet metal‐to‐ligand charge transfer to triplet ligand centered, as corroborated by time‐dependent DFT calculations. All complexes displayed a naphthalimide‐based deep‐red phosphorescence emission above λ = 630 nm in polymer matrix with good quantum yields ( Φ ≈ 0.2) and long lifetimes.