Conjugated copolymers comprised cyanophenyl-substituted spirobifluorene and tricarbazole-triphenylamine repeat units for blue-light-emitting diodes
作者:Ying Lin、Zhi-Kuan Chen、Teng-Ling Ye、Yan-Feng Dai、Dong-Ge Ma、Zhun Ma、Qin-De Liu、Yu Chen
DOI:10.1002/pola.23783
日期:2010.1.15
Incorporation of rigid spirobifluorene units into the copolymers led to blue‐shifted absorption peaks in dilute toluene solution. Cyclic voltammetric measurement indicated the bandgaps of the polymers were in the range of 2.77–2.94 eV. It was found that increasing cyanophenyl‐spirobifluorene content in the polymer backbone lowered both the HOMO and LUMO energy levels of the copolymers, which was beneficial
一系列共轭蓝色发光共聚物PTC-1,PTC-2和PTC-3,合成了不同比例的吸电子链段(被氰基苯基取代的螺双芴)和给电子链段(三咔唑-三苯胺)。表征了这些聚合物的结构,并测量了它们的热,光物理,电化学和电致发光性能。在共聚物中掺入刚性螺二芴单元会导致在甲苯稀释溶液中出现蓝移的吸收峰。循环伏安法测量表明聚合物的带隙在2.77–2.94 eV的范围内。发现增加聚合物主链中的氰基苯基-螺二芴含量会降低共聚物的HOMO和LUMO能级,这对于电子注入/传输器件的聚合物层是有益的。OLED器件评估表明,当纯聚合物用作配置为ITO / PEDOT:PSS / polymers / CsF / Ca / Al的器件中的发射层时,所有聚合物都会发出天蓝色至深蓝色的光。通过将30 wt%的PBD掺杂到聚合物层中来优化器件。在掺杂的器件中,PTC-2表现出最佳性能,其开启电压为3.0 V,最大亮度为7257 cd