Highly efficient blue organic light-emitting diodes from pyrimidine-based thermally activated delayed fluorescence emitters

Abstract

Three highly efficient blue thermally activated delayed fluorescence (TADF) emitters have been synthesized based on pyrimidine, 2-methylpyrimidine and 2-phenylpyrimidine as the acceptor and 10<italic>H</italic>-spiro[acridan-9,9′-fluorene] as the donor moiety.