Enhancing thermally activated delayed fluorescence characteristics by intramolecular B-N coordination in a phenylpyridine-containing donor-acceptor π-system.

An efficient thermally activated delayed fluorescence emitter based on an N-heteroarene acceptor bearing an intramolecularly coordinated boryl group was developed. The impact of the B-N coordination on the optoelectronic properties and electroluminescence performance of devices was investigated.