The present technology relates to a boron-containing compound with thermal activated delayed fluorescence (TADF), an emitting layer of an OLED. Rod-like diboron compounds bearing carbazole-amine-type groups have been designed. OLEDs by using the emitters show high efficiency with a low efficiency roll-off. The outstanding performance makes it attractive for color-display applications.

The present technology is a designsynthesis of a novel diboron material with TADF. A TADF material with a small triplet-to-singlet gap can harvest triplet energy via reversed intersystem crossing (RISC). These emitters greatly improve the internal quantum efficiency of the OLEDssurpass external quantum efficiency limit (5) of the conventional OLEDs.

The diboron materials are composed of common elements (C, H, NB) without using precious metal. The synthesis steps are simpleconvenient, the gram-leveleven a larger amount of preparation can be achieved in the laboratory, which greatly reduce the cost of emitting materials. It is expected to promote the local material productionupgrade the Taiwan＇s panellighting industry.