A Donor-Acceptor-type Host Material for Solution-processed Phosphorescent Organic Light-emitting Devices Showing High Efficiency

作者：Jun Chang Hwa; Pu Yong Jin^*; Igarashi Masahiro; Chiba Takayuki; Sasabe Hisahiro; Kido Junji

来源：Chemistry Letters, 2014, 43(12): 1935-1936.

DOI：10.1246/cl.140807

The solution-processable host material, 3,3%26apos;-{bis(9-phenylcarbazol-3-yl)]benzophenone (BCzBP), containing donor-type phenylcarbazole units and an acceptor-type benzophenone unit was synthesized. BCzBP showed a high excited triplet energy level and a high photoluminescence quantum efficiency with tris[2-(4-tolyl)pyridine]iridium ([Ir(mppy)3]) as a dopant, and a high glass-transition temperature. Solution-processed green phosphorescent OLEDs were fabricated with BCzBP. The device with BCzBP as a host showed comparable efficiencies to those of the corresponding device with 4,4%26apos;-bis(N-carbazolyl)biphenyl (CBP) as a host. At the same current density, the device with BCzBP showed a longer device lifetime than that with CBP, due to the high thermal stability and the bipolar nature of the host compound, BCzBP.

• 出版日期2014-12-5