EQE Climbing Over 6% at High Brightness of 14350 cd/m2 in Deep-Blue OLEDs Based on Hybridized Local and Charge-Transfer Fluorescence

ACS Applied Materials & Interfaces
Juewen ZhaoXiaohong Zhang

Abstract

Three deep-blue emitters PPi-Pid, PPi-Xid, and PPi-Mid based on a novel conjugated system phenantroimidazole-π-indolizine have been designed and synthesized. Here, indolizine with appropriate π-conjugation length was used as the acceptor profited from its high-photoluminescence quantum yield and good electron-withdrawing ability. Fluorescent organic light-emitting diodes (OLEDs) based on PPi-Pid, PPi-Xid, and PPi-Mid achieved deep-blue emissions with the Commission Internationale de L'Eclairage coordinates of (0.151, 0.076), (0.155, 0.052), and (0.153, 0.052); high brightness of 14350, 4377, and 4002 cd/m2; and high external quantum efficiencies (EQEs) of 6.01, 3.90, and 4.28%, respectively. Moreover, it is noticeable that all of the devices exhibited efficiencies increasing with brightness. In particular, the PPi-Pid-based device exhibited high EQE over 6% at a high brightness of 14350 cd/m2. Such high brightness along with high EQE is very rare whether in deep-blue fluorescent or thermally activated delayed fluorescent OLEDs.

References

Sep 26, 2008·Journal of the American Chemical Society·Yoshihiro YamaguchiZen-Ichi Yoshida
May 16, 2009·Nature·Sebastian ReinekeKarl Leo
Feb 26, 2013·Chemical Society Reviews·Minrong Zhu, Chuluo Yang
Sep 4, 2013·Journal of the American Chemical Society·Sunghun LeeYun-Hi Kim
Apr 22, 2016·ACS Applied Materials & Interfaces·Ilya KondrasenkoIgor O Koshevoy
Feb 12, 2017·ACS Applied Materials & Interfaces·Wen-Cheng ChenChun-Sing Lee

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