9,9-二辛基聚芴-苯并噻二唑交替共聚物的绿光偏振电致发光

通过缩聚法合成了绿光9,9-二辛基聚芴-苯并噻二唑交替共聚物（PFBT）.该聚合物在一定温度范围内形成向列液晶态，利用其在定向层上的有序排列，实现了峰值发光波长为550 nm的偏振电致发光.采用摩擦后的空穴注入层聚（3,4-乙撑二氧噻吩）∶聚（苯乙烯磺酸）（PEDOT:PSS）作为定向层，通过偏振紫外可见吸收光谱和偏振光致发光谱，研究了聚合物分子在薄膜平面内的单轴取向特性，计算得到薄膜的有序参数为075.制备了结构为ITO/PEDOT:PSS/PFBT/LiF/Al的聚合物电致发光器件，工作电压为15 V时，电致发光偏振率达到4，亮度和流明效率分别为450 cd/m²和021 cd/A. 关键词： 偏振发光 交替共聚物 聚合物电致发光器件

Green polarized electroluminescence from poly (9, 9-dioctylfluorene-alt- benzothiadiazole)

Polarized green electroluminescence has been achieved at the peak wavelength of 550 nm from alternate copolymer poly （9, 9-dioctylfluorene-alt- benzothiadiazole） （PFBT）, which was synthesized by polycondensation. The liquid crystalline state of this copolymer under certain thermal treatment results in the uniaxial orientation of the conjugated backbones on an alignment layer. A rubbed-hole injection layer poly（3,4-ethylenedioxythiophene）:polystyrenesulfonate （PEDOT:PSS） was utilized as the alignment layer. Polarized absorption and photoluminescence spectra indicate the good alignment of the copolymer films with an ordering parameter of 075. Polarized polymer light-emitting diodes were fabricated with the structure of ITO/PEDOT:PSS/PFBT/LiF/Al. An electroluminescence polarization ratio of about 4 was achieved at a voltage of 15 V, with the luminance of 450 cd/m² and luminous efficiency of 021 cd/A.