Platinum(II) polymetallayne-based phosphorescent polymers with enhanced triplet energy-transfer: synthesis, photophysical, electrochemistry, and electrophosphorescent investigation
Platinum(II) polymetallayne-based phosphorescent polymers with enhanced triplet energy-transfer: synthesis, photophysical, electrochemistry, and electrophosphorescent investigation
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DOI：
10.1039/c5ra03697f
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发表时间：
2015-04
期刊：
影响因子：
3.9
通讯作者：
Zuan Huang;Boao Liu;Jiang Zhao;Yue He;X. Yan;Xianbin Xu;Guijiang Zhou;Xiaolong Yang;Zhaoxin Wu-Zhao
中科院分区：
文献类型：
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作者：
Zuan Huang;Boao Liu;Jiang Zhao;Yue He;X. Yan;Xianbin Xu;Guijiang Zhou;Xiaolong Yang;Zhaoxin Wu-Zhao
通过Sonogashira交叉偶联反应，以不同的IrIII ppy型（ppy = 2-苯基吡啶阴离子）配合物为磷光中心，成功地合成了两个系列的含联咔唑基铂（II）多金属骨架的新型磷光共聚物.电子物理研究不仅揭示了聚合物溶液中从多金属链段到磷光单元的高效三重态能量传递过程，而且揭示了三重态能量传递过程与不同激发态能级之间的结构-性能关系。此外，磷光共聚物可产生具有高EL效率和11.49 cd A-1的电流效率（ηL）、4.38%的外量子效率（ηext）、3.78 lm W-1的功率效率（ηP）的发黄光磷光OLED（PHOLED），和具有5.86 cd A-1的ηL、10.1%的ηext、和2.29 lm W-1的ηP，表示通过磷光共聚物实现的非常好的电致发光性能。本工作不仅为该类新型磷光聚合物的进一步研究提供了重要线索，而且为高效磷光聚合物的设计和合成提供了新的途径。
Two series of new phosphorescent copolymers with bicarbazole-based platinum(II) polymetallayne backbones have been successfully prepared through Sonogashira cross-coupling with different IrIII ppy-type (ppy = 2-phenylpyridine anion) complexes as phosphorescent centers. The photophysical investigations not only indicate a highly efficient triplet energy-transfer process from the polymetallayne segments to the phosphorescent units in the polymer solution, but also figure out the structure–property relationship between the triplet energy-transfer process and the energy-levels of different excited states. In addition, the phosphorescent copolymers can produce yellow-emitting phosphorescent OLEDs (PHOLEDs) with high EL efficiencies and a current efficiency (ηL) of 11.49 cd A−1, an external quantum efficiency (ηext) of 4.38%, a power efficiency (ηP) of 3.78 lm W−1, and red-emitting PHOLEDs with a ηL of 5.86 cd A−1, ηext of 10.1%, and a ηP of 2.29 lm W−1, representing very decent electroluminescent performances achieved by the phosphorescent copolymers. Herein, this work not only furnishes very important clues for further polishing of this category novel phosphorescent polymer, but also provides a new approach to the design and synthesis of highly efficient phosphorescent copolymers.