A new class of yellow- to red-emitting carbazolylgold(iii) complexes containing isomeric thienopyridine and thienoquinoline moieties in the cyclometalating ligand has been designed to realize high performance OLEDs with long operational lifetime.

We report the design of a new class of fused heterocyclic alkynyl ligand-containing gold(iii) complexes, which shows tunable emission colors spanning yellow to red region and exhibits thermally activated delayed fluorescence (TADF) properties.