Molecular design of deep blue fluorescent emitters with 20% external quantum efficiency and narrow emission spectrum

• A deep blue thermally activated delayed fluorescent emitter with a y color coordinate below 0.15.
• A high quantum efficiency close to 20% in deep blue thermally activated delayed fluorescent device.
• Rigid acceptor moiety to narrow the emission spectrum of blue thermally activated delayed fluorescent emitter.

A thermally activated delayed fluorescent (TADF) emitter, 2,7-bis(9,9-dimethylacridin-10(9H)-yl)-9,9-dimethyl-9H-thioxanthene 10,10-dioxide (DMTDAc), was developed as a deep blue TADF emitter using a rigid 9,9-dimethyl-9H-thioxanthene 10,10-dioxide (DMTD) acceptor and an acridine donor. The rigid DMTD acceptor narrowed emission spectrum of DMTDAc by interlocking two phenyl units of diphenylsulfone. A deep blue TADF device with an external quantum efficiency close to 20% with a deep blue color coordinate of (0.15,0.13) was provided using the DMTDAc TADF emitter.

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