An Exciplex Host for Deep-Blue Phosphorescent Organic Light-Emitting Diodes Hyoungcheol Lim Hyun Shin Kwon-Hyeon Kim Seung-Jun Yoo Jin-Suk Huh Jang-Joo Kim 10.1021/acsami.7b10914.s001 https://acs.figshare.com/articles/journal_contribution/An_Exciplex_Host_for_Deep-Blue_Phosphorescent_Organic_Light-Emitting_Diodes/5510335 The use of exciplex hosts is attractive for high-performance phosphorescent organic light-emitting diodes (PhOLEDs) and thermally activated delayed fluorescence OLEDs, which have high external quantum efficiency, low driving voltage, and low efficiency roll-off. However, exciplex hosts for deep-blue OLEDs have not yet been reported because of the difficulties in identifying suitable molecules. Here, we report a deep-blue-emitting exciplex system with an exciplex energy of 3.0 eV. It is composed of a carbazole-based hole-transporting material (mCP) and a phosphine-oxide-based electron-transporting material (BM-A10). The blue PhOLEDs exhibited maximum external quantum efficiency of 24% with CIE coordinates of (0.15, 0.21) and longer lifetime than the single host devices. 2017-10-02 00:00:00 CIE phosphine-oxide-based electron-transporting material Deep-Blue Phosphorescent Organic Light-Emitting Diodes carbazole-based hole-transporting material BM-A OLED exciplex hosts deep-blue-emitting exciplex system PhOLED quantum efficiency