Indenofluorene-based-copolymers: Influence of electron-deficient benzothiadiazole (BT) and benzooxadiazole (BO) moieties on light emitting devices
Indenofluorene-based-copolymers: Influence of electron-deficient benzothiadiazole (BT) and benzooxadiazole (BO) moieties on light emitting devices
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DOI：
10.1016/j.orgel.2019.03.050
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发表时间：
2019-03
影响因子：
3.2
通讯作者：
T. Do;K. Matsuki;T. Sakanoue;F. Wong;Sergei Manzhos;Chun‐Sing Lee;J. Bell;T. Takenobu;P. Sonar
中科院分区：
文献类型：
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作者：
T. Do;K. Matsuki;T. Sakanoue;F. Wong;Sergei Manzhos;Chun‐Sing Lee;J. Bell;T. Takenobu;P. Sonar
本文合成并表征了聚[(6，6，12，12-tetraoctylindenofluorene)-co-(2，1，3-benzothiadiazole)](PIFL-BT)和聚[(6，6，12，12-tetraoctylindenofluorene)-co-(2，1，3-苯并恶二唑(PIFL-BO)两种共聚物。研究了苯并噻二唑(BT)和苯并恶二唑(BO)两种电子接受基团与共轭聚合物主链上常见的四烷基取代吲哚嵌段的作用，并对其进行了热、光、电性能测试。为了研究其电致发光特性，以共聚物为发光层，制备了有机电致发光二极管(OLED)和发光电化学电池(LECs)。对于有机发光器件，只有聚合物PIFL-B发出黄光，CIE坐标为(0.43，0.55)，最大电流效率(CEmax)为0.24 cd/A，最大功率效率(PEmax)为0.11lm/W，最大亮度(MBmax)为1398 cd/m2。对于LEC器件，两种材料都显示出比OLED器件更高的发光和电流密度，这表明LEC中有更好的载流子注入。
Herein, two copolymers, poly [(6,6,12,12-tetraoctylindenofluorene)-co-(2,1,3-benzothiadiazole)] (PIFL-BT) and poly [(6,6,12,12-tetraoctylindenofluorene)-co-(2,1,3- benzooxadiazole)] (PIFL-BO) were synthesized and characterized. The effect of two electron accepting moieties benzothiadiazole (BT) and benzooxadiazole(BO) in combination with common tetraalkyl substituted indenofluorene building block in the backbone of conjugated polymer is studied in detail via thermal, optical, and electrochemical characteristics. To investigate the electroluminescence characteristics, both organic light emitting diodes (OLEDs) and light emitting electrochemical cells (LECs) devices are fabricated using copolymers as an active light-emitting layer. For the OLED devices, only polymerPIFL-BTemitted yellow light with CIE coordinates of (0.43, 0.55), a maximum current efficiency (CEmax) of 0.24 cd/A, a maximum power efficiency (PEmax) of 0.11 lm/W and a maximum brightness (MBmax) of 1398 cd/m2. For the LEC device, both materials showed light emission and higher current density than OLEDs devices, indicating better carrier injection in LECs.