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  

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

作　　者：朱德喜[1] 甄红宇[1] 叶辉[1] 刘旭[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,杭州310027

出　　处：《物理学报》2009年第3期2067-2071,共5页Acta Physica Sinica

基　　金：国家博士后科学基金(批准号:20070410394)资助的课题~~

摘　　要：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550nm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15V时,电致发光偏振率达到4,亮度和流明效率分别为450cd/m2和0.21cd/A.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.

关 键 词：偏振发光 交替共聚物 聚合物电致发光器件 

分 类 号：O482.31[理学—固体物理]