Researchers from the University of Science and Technology of China (USTC and the Beijing Information Science and Technology University (BISTU), have developed a new strategy for the design of deep red MR-TADF OLED emitters, that offers high efficiency, good color emission and long lifetimes.
The researchers report they have developed a new deep red (0.657,0343 CIE) OLED emitter material that achieves high efficiency, over 43% EQE, which they say is the most efficient MR-TADF red emitter.
The key innovation lies in the molecule BNTPA, which was designed to incorporate secondary electron-donating units and extend the π-skeleton within multiresonance cores. This structural modification significantly enhances intramolecular charge transfer, enabling the molecule to more efficiently handle the excitation energy. The researchers say that the new OLED emitter offers a light emission that is effectively shifted into the red spectrum, while still maintaining narrowband characteristics for ensuring high color fidelity.
