Self-Host Blue-Emitting Iridium Dendrimer Containing Bipolar Dendrons for Nondoped Electrophosphorescent Devices with Superior High-Brightness Performance
Self-Host Blue-Emitting Iridium Dendrimer Containing Bipolar Dendrons for Nondoped Electrophosphorescent Devices with Superior High-Brightness Performance
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含有双极树枝状分子的自宿主蓝光铱树枝状聚合物，用于具有卓越高亮度性能的非掺杂电致磷光器件
DOI：
10.1021/acsami.6b09732
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发表时间：
2016
影响因子：
9.5
通讯作者：
Wang Fosong
中科院分区：
文献类型：
--
作者：
Wang Yang;Lu Yaoming;Gao Baoxiang;Wang Shumeng;Ding Junqiao;Wang Lixiang;Jing Xiabin;Wang Fosong
通过后树枝化路线设计并合成了一种新型自宿主蓝色发射铱树枝状聚合物，即B-CzPO，其中选择双极性咔唑/三苯基膦氧化物杂化物作为外围树枝状聚合物，而不是单极性类似物B-CzG2中使用的p型寡咔唑。这种结构修饰可以使B-CzPO相对于B-CzG2具有更平衡的电荷传输。由于效率滚降显着降低，B-CzPO 的非掺杂磷光有机发光二极管（PhOLED）表现出优异的高亮度性能，在 1000、5000 和 10000 cd/m2 下的发光效率分别为 21.2、16.1 和 10.5 cd/A。与B-CzG2（即7.8 cd/A @5000 cd/m2）相比，B-CzPO 实现了一倍以上的高亮度性能。结果表明，具有双极性特征的自主体磷光树枝状聚合物的设计将是开发适用于包括普通照明和微型显示器在内的高亮度应用的高效非掺杂PhOLED的有前途的策略。
A novel self-host blue-emitting iridium dendrimer, namely,B-CzPO, has been designed and synthesized via a postdendronization route, where a bipolar carbazole/triphenylphosphine oxide hybrid is selected as the peripheral dendron instead of the p-type oligocarbazole used in unipolar analogueB-CzG2. This structural modification can renderB-CzPOwith more balanced charge transportation relative to that ofB-CzG2. As a result of the significantly reduced efficiency roll-off, the nondoped phosphorescent organic light-emitting diodes (PhOLEDs) ofB-CzPOshow a superior high-brightness performance, revealing a luminous efficiency of 21.2, 16.1, and 10.5 cd/A at 1000, 5000, and 10 000 cd/m2, respectively. Compared with that ofB-CzG2(i.e., 7.8 cd/A @5000 cd/m2), more than doubled high-brightness performance is achieved forB-CzPO. The results indicate that the design of self-host phosphorescent dendrimers with a bipolar feature will be a promising strategy to develop efficient nondoped PhOLEDs suitable for high-brightness applications including general illumination and micro displays.