Dendron engineering in self-host blue iridium dendrimers towards low-voltage-driving and power-efficient nondoped electrophosphorescent devices
Dendron engineering in self-host blue iridium dendrimers towards low-voltage-driving and power-efficient nondoped electrophosphorescent devices
复制标题
自宿主蓝色铱树枝状聚合物中的树枝状大分子工程用于低电压驱动和高能效非掺杂电致磷光器件
DOI：
10.1039/c6cc08722a
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发表时间：
2017
影响因子：
4.9
通讯作者：
Wang Fosong
中科院分区：
文献类型：
--
作者：
Wang Yang;Wang Shumeng;Ding Junqiao;Wang Lixiang;Jing Xiabin;Wang Fosong
Dendron工程在自主体蓝色Ir树枝状聚合物中首次开发了功率高效的非掺杂电致磷光器件，该器件可以在接近理论极限的低电压下工作（Eg/e：对应于光学带隙除以电子电荷）。随着树枝状分子HOMO能级从B-POCz到B-CzCz和B-CzTA的增加，有效的空穴注入有利于促进激子的形成，导致驱动电压的显著降低和功率效率的提高。因此，B-CzTA的非掺杂器件实现了2.7/3.4/4.4 V的极低驱动电压，并分别在1、100和1000 cd m-2下实现了30.3/24.4/16.3 lm W-1的高功率效率。我们相信，这项工作将铺平道路的设计，用于节能显示器和固态照明的新型节能自主体蓝色磷光树枝状聚合物。
Dendron engineering in self-host blue Ir dendrimers is reported to develop power-efficient nondoped electrophosphorescent devices for the first time, which can be operated at low voltage close to the theoretical limit (Eg/e: corresponding to the optical bandgap divided by the electron charge). With increasing dendron's HOMO energy levels from B-POCz to B-CzCz and B-CzTA, effective hole injection is favored to promote exciton formation, resulting in a significant reduction of driving voltage and improvement of power efficiency. Consequently, the nondoped device of B-CzTA achieves extremely low driving voltages of 2.7/3.4/4.4 V and record high power efficiencies of 30.3/24.4/16.3 lm W−1 at 1, 100 and 1000 cd m−2, respectively. We believe that this work will pave the way to the design of novel power-efficient self-host blue phosphorescent dendrimers used for energy-saving displays and solid-state lightings.