Thermally Activated Delayed Fluorescence from d¹⁰ -Metal Carbene Complexes through Intermolecular Charge Transfer and Multicolor Emission with a Monomer-Dimer Equilibrium.

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 S₁ and T₁ (ΔE S1-T1 =60 meV). Further experiments reveal that there are dual-emission pro

SUBMITTER: Cao L 

PROVIDER: S-EPMC7839463 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature