High-performance red organic light-emitting devices based on an exciplex system with thermally activated delayed fluorescence characteristic
High-performance red organic light-emitting devices based on an exciplex system with thermally activated delayed fluorescence characteristic
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DOI：
10.1016/j.orgel.2016.09.020
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发表时间：
2016-12
影响因子：
3.2
通讯作者：
S. Yuan;Xiaoyang Du;Juewen Zhao;W. Liu;Hui Lin;Caijun Zheng;S. Tao;Xiaohong Zhang
中科院分区：
文献类型：
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作者：
S. Yuan;Xiaoyang Du;Juewen Zhao;W. Liu;Hui Lin;Caijun Zheng;S. Tao;Xiaohong Zhang
为了实现高性能的红色有机电致发光器件（OLED），开发了一种具有热激活延迟荧光（TADF）特性的新型激基复合物体系Tris-PCz：B4 PyPPM，作为红色荧光和磷光发光体的主体。由于蓝绿色PL光谱和合适的三重态能级为2.53 eV，激基复合物系统匹配红色荧光和磷光掺杂剂的要求。当Tris-PCz：B4 PyPPM激基复合物体系的最佳混合摩尔比为5：5时，该体系在红色荧光和磷光器件中均表现出出色的主体性能。基于DCJTB的红色荧光器件具有2.3 V的低开启电压和9.3%的极高的最大外量子效率（EQE）。以Ir（MDQ）2acac为发光体的红色磷光器件的最大EQE为20.3%。这些显著的结果证明了TADF激基复合物体系同时作为高性能荧光和磷光红色器件的主体的可行性。
To realize high-performance red organic light-emitting diodes (OLEDs), a novel exciplex system Tris-PCz:B4PyPPM with thermally activated delayed fluorescence (TADF) characteristic was developed as the host of both red fluorescent and phosphorescent emitters. Due to the blue-green PL spectrum and suitable triplet energy level of 2.53 eV, the exciplex system matches the requirements of both red fluorescent and phosphorescent dopants. With an optimized mixing molar ratio of 5:5, Tris-PCz:B4PyPPM exciplex system shows outstanding host performance in both the red fluorescent and phosphorescent devices. The red fluorescent device based on DCJTB exhibits a low turn-on voltage of 2.3 V and an extremely high maximum external quantum efficiency (EQE) of 9.3%. And the red phosphorescent device with the Ir(MDQ)2acac as the emitter realizes a maximum EQE of 20.3%. These remarkable results prove the feasibility of TADF exciplex systems simultaneously as the hosts of both high-performance fluorescent and phosphorescent red devices.