It is understood that the research team has achieved a lot of results in the research and development of improving the high efficiency performance of organic light-emitting devices. Like R&D personnel, they have developed a heat-activated retardation fluorescent material (TADF) and its highly efficient OLED devices that are available for evaporation and solution processing. The researchers successfully applied thiabium oxide to the field of organic optoelectronics and acted as an electron acceptor. The benzene ring was used as a bridge, and acridine and phenoxazine were used as electron donors respectively. The design and development of vapor deposition were simultaneously applied. And solution processing processes for the new thermally activated delayed fluorescence (TADF) materials ACRDSO2 and PXZDSO2. The maximum external quantum efficiency of the green-vapor-deposited device based on ACRDSO2 is 19.2%, and the solution processing device without the hole transport layer can achieve an external quantum efficiency of 17.5%, compared with the classical green light TADF material 4CzIPN. The solution processing device has been greatly improved in both the driving voltage and the external quantum efficiency.
According to reports, pure organic luminescent materials with thermal activation delayed fluorescence (TADF) characteristics are a potential for achieving 100% exciton utilization compared to the rare metal-containing phosphorescent materials currently used in commercial OLED panels. A material that combines low cost advantages. At present, TADF-OLED has been able to achieve electroluminescence performance comparable to that of phosphor-based OLEDs, and has become a popular candidate for low-cost and high-efficiency OLED technology applications.
At the same time, the R&D team designed a new three-spiral ring donor unit with a classic triazine receptor to successfully prepare a TspiroS-TRZ, a blue-light TADF material with high efficiency and versatility. Compared with non-spiral and double-spiral acridine acceptor units, long rod-shaped, strong-rigid, large-dimensional sterically hindered triple-spinned units can form longer molecular skeletons and form a double-spiral non- Conjugate structure. This work provides a high efficiency and versatile design of blue light TADF materials.