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Thermally Activated Delayed Fluorescence from d 10 ‐Metal Carbene Complexes through Intermolecular Charge Transfer and Multicolor Emission with a Monomer–Dimer Equilibrium
Author(s) -
Cao Lei,
Huang Shiqing,
Liu Wei,
Zhao Hongyan,
Xiong XiaoGen,
Zhang JianPing,
Fu LiMin,
Yan Xiaoyu
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004106
Subject(s) - photochemistry , chemistry , dimer , homo/lumo , intermolecular force , carbene , microsecond , steric effects , carbazole , monomer , fluorescence , crystallography , molecule , stereochemistry , polymer , organic chemistry , physics , quantum mechanics , astronomy , catalysis
Abstract A series of two‐coordinate Au I and Cu I complexes ( 3 a , 3 b and 5 a , 5 b ) are reported as new organometallic thermally activated delayed fluorescence (TADF) emitters, which are based on the carbene–metal–carbazole model with a pyridine‐fused 1,2,3‐triazolylidene (PyTz) ligand. PyTz features low steric hindrance and a low‐energy LUMO (LUMO=−1.47 eV) located over the π* orbitals of the whole ligand, which facilitates intermolecular charge transfer between a donor (carbazole) and an accepter (PyTz). These compounds exhibit efficient TADF with microsecond lifetimes. Temperature‐dependent photoluminescence kinetics of 3 a supports a rather small energy gap between S 1 and T 1 (Δ ES1 - T1=60 meV). Further experiments reveal that there are dual‐emission properties from a monomer–dimer equilibrium in solution, exhibiting single‐component multicolor emission from blue to orange, including white‐light emission.