Bipolar Host System Bearing Polymeric Donor and Small Molecular Acceptor for Thermally Activated Delayed Fluorescence OLEDs
발표자
()
초록
내용
From the past, many kinds of polymeric hosts have been designed and synthesized for solution-processable organic light-emitting diode (OLED). Among them, side-chain host polymers have some advantages because their energy levels and mobility could be easily tuned by using various host pendants. Moreover, in order to improve the charge balance of them, a single bipolar host or dual host with hole and electron character was introduced. However, they have some demerits, such as complicated synthetic routes or reproducibility of polymerization. To solve these problems, mixed host system has been developed by using polymeric host and small molecular host. In this study, we synthesized polymeric hosts as hole character and small molecular hosts as electron character for the mixed host system. Blend film showed homogeneity of film surface and improved charge balance. Corresponding green thermally activated delayed fluorescence OLED with the blend hosts exhibited highly improved efficiencies.