Thermally Activated Delayed Fluorescent Organoboron Materials and Hyperphosphorescence

Description

Organic light-emitting diodes (OLED) have gained a pivotal position in both the flat panel displays and solid-state lighting luminaries. Their niches include excellent efficiencies, high durability, and greater versatility in fabrication of both monitors and displays in different sizes and sharps. All are important for making smartphones and various hand-hold electronic devices. In 2017, the launch of iPhone X with OLED panel served as the landmark. Ever since, relevant OLED panels have been installed in various 3C products manufactured by Apple and its rivals such as Samsung, LG and even Huawei. This means that the OLED devices have effectively penetrated our life and retained their influences for many more years to come. As for the future prospective, both the emitting and carrier transporting materials constitute a very important part of ongoing technological developments, i.e. better the materials, greater the deviceperformances. To this end, the borane-based, boron-nitrogen (BN) and boron-oxygen (BO)-containing materials have been extensively used as emitting materials and/or carrier transporting materials employed in fabrication of various OLED devices. As for the future designs of organoboron emitters, both the thermally activated delayed fluorescent (TADF) and multi-resonance thermally activated delayed fluorescent (MRTADF) materials are believed to exhibit improved efficiency and narrowband full width at half maximum (FWHM), while those BN based organoboron compounds that cannot serve as adequate emitting materials could be employed as either the host or electron transporting materials. Hence, they are the essential materials in giving superior OLED efficiency and, naturally, will be the main research objectives of this research proposal. Finally, fabricate of phosphor-sensitized fluorescence (PAF) OLED devices using both the custom-made Ir(III) carbene phosphorescent sensitizers and newly proposed organoboron terminal emitters will be executed to demonstrate “hyperphosphorescence”, i.e. one most probable technology for completely resolving the durability issue of blue OLED panels.