Highly emissive d¹⁰ metal complexes as TADF emitters with versatile structures and photophysical properties

This section highlights TADF photophysical properties of d¹⁰ metal complexes with various nuclearity, coordination structures, and ligand types. The compiled photophysical data indicate the coordination structure enabling smaller ?EST is essential to achieve higher radiative rate constants of TADF. The major drawback of d¹⁰ metal complexes is their large structural changes in the excited state, which significantly lowers their emission yields, and broadens their luminescence spectra because of the large Stokes shift. The large flattening distortion also significantly reduces the radiative rate constant of phosphorescence as well as the intersystem crossing rate between ¹MLCT and ³MLCT.