Highly efficient blue-light-emitting diodes from polyfluorene containing bipolar pendant groups
Highly efficient blue-light-emitting diodes from polyfluorene containing bipolar pendant groups
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DOI：
10.1021/ma030123e
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发表时间：
2003-08
期刊：
影响因子：
5.5
通讯作者：
C. Shu;R. Dodda;Fang-Iy Wu;Michelle Liu;A. Jen
中科院分区：
文献类型：
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作者：
C. Shu;R. Dodda;Fang-Iy Wu;Michelle Liu;A. Jen
合成了一种在芴的C9位上引入空穴传输性三苯胺（TPA）和电子传输性恶二唑（OXD）侧基的高效蓝光聚合物。光致发光和电化学测试结果表明，共聚物中的侧链和聚芴主链都保持了各自的电子特性。它显示出纯蓝色发射，即使在150 °C下在氮气下退火20小时后也没有形成聚集体或准分子。此外，它还证明了在电致发光中改善的电荷注入和平衡的电荷传输。使用该共聚物作为发光层的单层器件的最大外量子效率为1.21%（在亮度为354 cd/m2，驱动电压为7.6V时）。在偏压为12.0V、电流密度为640 mA/cm ~ 2时，器件的最大亮度达到4080 cd/m ~ 2。
A highly efficient blue-light-emitting copolymer with bulky hole-transporting triphenylamine (TPA) and electron-transporting oxadiazole (OXD) pendant groups at the C-9 position of fluorene was synthesized. The results from photoluminescence and electrochemical measurements reveal that both the side chains and the polyfluorene main chain retain their own electronic characteristics in the copolymer. It shows a pure blue emission with no aggregates or excimers formed even after being annealed at 150 °C under nitrogen for 20 h. In addition, it also demonstrates improved charge injection and balanced charge transport in electroluminescence. The maximum external quantum efficiency of a single-layer device using this copolymer as the emitting layer is 1.21% (at a brightness of 354 cd/m2 with driving voltage of 7.6 V). The maximum luminance of the device reaches 4080 cd/m2 at a bias of 12.0 V and a current density of 640 mA/cm2.