An Exciplex Host for Deep-Blue Phosphorescent Organic Light-Emitting Diodes

作者：Lim Hyoungcheol; Shin Hyun; Kim Kwon Hyeon; Yoop Seung Jun; Huh Jin Suk; Kim Jang Joo^*

来源：ACS Applied Materials & Interfaces, 2017, 9(43): 37883-37887.

DOI：10.1021/acsami.7b10914

• deep blue exciplex
• exciplex host
• blue phosphorescent OLED
• high triplet level
• operational lifetime
• charge balance

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.

• 出版日期2017-11-1