Efficient Blue-Emitting OLED Phosphors and Devices

Description

Display panels made from organic light emitting diodes (OLED) have gradually become the standard component of the high-end and high quality smartphones sold in commercial markets. Despite of successful commercialization of both green and red-emitting phosphors, development of blue-emitting materials is much lagging behind and has become one grand challenge for the whole OLED industries. In this proposal, we plan to lunch several new series of Ir(III) emitters bearing the bis-tridentate architecture, which is in sharp contrast to the traditional design with three bidentate chelates. Due to the higher rigidity and greater chelate-to-metal bond strength of tridentate chelates, we expected the corresponding blue emitters could display an improved emission efficiency as well as better stability against degradation during device operation. Moreover, we plan to optimize their photophysical and chemical properties to obtain Ir(III) emitters with both blue photoluminescence (PL) and electroluminescence (EL) with emission peak max. around 460 – 485 nm, PLQY > 80%, radiative emission lifetime (tau) < 5 microsecond, and finding the best synthetic protocols to these Ir(III) emitters. Finally, the device performances, particularly the external quantum efficiency of corresponding OLED, will be optimized through the development of both novel OLED materials and device architectures.