侧链含环金属铱配合物的芴-咔唑有机磷光聚合物的合成和光电性能

Synthesis and Optoelectronic Properties of Flourene-Carbazole Organic Phosphorescent Polymers Pending Cyclomatlated Iridium Complex Moiety

以聚芴为主链,通过Suzuki偶联反应合成了一类新型侧链含环金属铱配合物的芴-咔唑有机磷光聚合物PFCzIrpiq,通过凝胶渗透色谱仪测定其分子量,通过核磁共振氢谱表征化学结构,研究了聚合物的光电性能。以该聚合物为发光层制备结构为ITO/PEDOT:PSS(50 nm)/PFCzIrpiq(45 nm)/LiF(0.5 nm)/Al(150 nm)的器件,测试了器件的电致发光性能。结果表明,在聚合物单体中铱配合物单元摩尔投料比对聚合物的发光颜色影响较大:当铱配合物单元摩尔投料比为1%时聚合物器件的色坐标为(0.22,0.22),位于蓝光区域;当增大到5%时聚合物器件色坐标为(0.65,0.35),位于红光区域;随着铱配合物单元摩尔投料比的增大,器件的启亮电压变化较小,而器件的电流密度逐渐减小,器件的最大发光亮度逐渐增大。当铱配合物单元摩尔投料比为5%时,器件的最大发光亮度为48 cd/m2。

A novel flourene-alt-karbazole organic phosphorescenct polymers （PFCzlrpiq） containing a pendent phosphor chromophore of the （Piq）21r（Pic） were synthesized via Suzuki coupling reaction. Their molecular mass was measured by gel permeation chromatograph, chemical structure was characterized by ＇H NMR, and the photophysical property, thermal stability and electrochemical property of these polymers were investigated by UV absorption spectra, fluorescence spectra, thermogravimetric analysis and cyclic voltammetry. Using the polymers as emitting layer, the devices were made with a configuration of ITO/PEDOT： PSS （50 nm）/PFCzlrpiq （45 nm）/LiF（0.5 nm）/AI （150 nm）, and their electroluminescent properties were measured. The results show that the molar percentage of （Piq）21r（Pic） in these polymers has great influence on light-emitting color of these polymers. When the molar percentage was 1%, the device exhibited blue emission with a CIE coordinate of （0.22, 0.22）; when the percentage was increased to 5%, the device emitted saturated red light with a CIE coordinate（0.65, 0.35）. Furthermore, with the increasing of molar percentage of （Piq）21r（Pic）, the current density decreased and the maximum brightness increased gradually. When the molar percentage was 5%, the maximum brightness of 48 cd/ m^2 was achieved.