MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Institute of Chemistry for New Energy Material, Department of Chemistry, School of Science, ‡State Key Laboratory for Mechanical Behavior of Materials, and §Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University , Xi'an 710049, P. R. China.
ACS Appl Mater Interfaces. 2017 May 17;9(19):16360-16374. doi: 10.1021/acsami.7b04509. Epub 2017 May 4.
A high triplet energy level (E) of ca. 2.83 eV has been achieved in a novel polymer backbone through tuning the arrangement of two kinds of building blocks, showing enhanced hole injection/transporting capacity. Based on this new polymer backbone with high E, both blue and white phosphorescent polymers were successfully developed with a trade-off between high E and enhanced charge-carrier transporting ability. In addition, their photophysical features, electrochemical behaviors, and electroluminescent (EL) properties have been characterized in detail. Benefitting from the advantages associated with the novel polymer backbone, the blue phosphorescent polymers show top-ranking EL performances with a maximum luminance efficiency (η) of 15.22 cd A, corresponding to a power efficiency (η) of 12.64 lm W, and external quantum efficiency (η) of 6.22% and the stable Commission Internationale de L'Eclairage (CIE) coordinates of (0.19, 0.38). Furthermore, blue-orange (B-O) complementary-colored white phosphorescent polymers based on this novel polymer backbone were also obtained showing encouraging EL efficiencies of 12.34 cd A, 9.59 lm W, and 4.10% in the optimized WOLED together with exceptionally stable CIE coordinates of (Δx = 0.014, Δy = 0.010) in a wide driving voltage range from 4 to 16 V. All of these attractive EL results achieved by these novel phosphorescent polymers show the great potential of this new polymer backbone in developing highly efficient phosphorescent polymers.
通过调节两种构筑单元的排列方式，在一种新型聚合物主链中实现了高达 2.83eV 的三重激发能（E），表现出增强的空穴注入/传输能力。基于这种具有高 E 的新型聚合物主链，成功地开发了蓝色和白色磷光聚合物，在高 E 和增强的电荷载流子传输能力之间取得了平衡。此外，详细研究了它们的光物理特性、电化学行为和电致发光（EL）性能。得益于新型聚合物主链的优势，蓝色磷光聚合物表现出卓越的 EL 性能，最大亮度效率（η）为 15.22cdA，相应的功率效率（η）为 12.64lmW，外量子效率（η）为 6.22%，以及稳定的国际照明委员会（CIE）坐标为（0.19，0.38）。此外，基于这种新型聚合物主链的蓝色-橙色（B-O）互补色磷光聚合物也被获得，在优化的全磷光有机发光二极管（WOLED）中显示出令人鼓舞的 EL 效率，分别为 12.34cdA、9.59lmW 和 4.10%，以及在 4-16V 的宽驱动电压范围内非常稳定的 CIE 坐标（Δx=0.014，Δy=0.010）。这些新型磷光聚合物所实现的所有有吸引力的 EL 结果表明，这种新型聚合物主链在开发高效磷光聚合物方面具有巨大的潜力。
