Oligosiloxane functionalized with pendant (1,3-bis(9-carbazolyl)benzene) (mCP) for solution-processed organic electronics.
Oligosiloxane functionalized with pendant (1,3-bis(9-carbazolyl)benzene) (mCP) for solution-processed organic electronics.
复制标题
DOI：
10.1002/chem.201402374
复制
发表时间：
2014-12
期刊：
影响因子：
--
通讯作者：
Dianming Sun;Zhaomin Yang;Z. Ren;Huihui Li;M. Bryce;Dongge Ma;Shouke Yan
中科院分区：
文献类型：
--
作者：
Dianming Sun;Zhaomin Yang;Z. Ren;Huihui Li;M. Bryce;Dongge Ma;Shouke Yan
合成了一种具有1，3-二(9-咔唑基)苯(MCP)官能化的低聚硅氧烷衍生物，该化合物直接与低聚硅氧烷主链的硅原子相连。与MCP相比，低聚硅氧烷链的连接显著提高了聚合物的热稳定性和形态稳定性，具有较高的分解温度(Td=540℃)和玻璃化转变温度(Tg=142℃)。ODcheMSi的硅-氧键破坏了主链共轭，保持了较高的三重态能级(Et=3.0 eV)。以双(4，6-二氟苯基)吡啶-N，C(2)吡啶甲酸IrPIC(FIrpic)为发射体，以ODChMSi为基质的有机电致发光二极管(PHOLED)具有较低的开启电压为5.0V，最大外量子效率为9.2%，最大电流效率为17.7cda(-1)。该器件的整体性能可与已报道的最佳解决方案处理的蓝色PhOLED相媲美。采用ODChMSi作为有源层的存储器件具有非易失性一次写入多次读取(WORM)特性，保持时间的稳定性高达10(4)S，并且具有较低的开启电压。这种开关行为可以用不同的稳定构象来解释，这些构象是在电场作用下通过侧链芳基的π-π堆积排列而获得的具有高或低电导态的不同构象。对PHOLED和存储器件的这些结果表明，这种低聚硅氧烷-MCP杂化结构在高性能溶液处理的光电子学应用中具有广泛的应用前景。
A new oligosiloxane derivative (ODCzMSi) functionalized with the well-known 1,3-bis(9-carbazolyl)benzene (mCP) pendant moiety, directly linked to the silicon atom of the oligosiloxane backbone, has been synthesized and characterized. Compared to mCP, the attachment of the oligosiloxane chain significantly improves the thermal and morphological stabilities with a high decomposition temperature (Td =540 °C) and glass transition temperature (Tg =142 °C). The silicon-oxygen linkage of ODCzMSi disrupts the backbone conjugation and maintains a high triplet energy level (ET =3.0 eV). A phosphorescent organic light-emitting diode (PhOLED) using iridium bis(4,6-difluorophenyl)pyridinato-N,C(2) picolinate (FIrpic) as the emitter and ODCzMSi as the host shows a relatively low turn-on voltage of 5.0 V for solution-processed PhOLEDs, maximum external quantum efficiency of 9.2 %, and maximum current efficiency of 17.7 cd A(-1) . The overall performance of this device is competitive with the best reported solution-processed blue PhOLEDs. Memory devices using ODCzMSi as an active layer exhibit non-volatile write-once read-many-times (WORM) characteristics with high stability in retention time up to 10(4) s and a low switch on voltage. This switching behaviour is explained by different stable conformations of ODCzMSi with high or low conductivity states which are obtained under the action of electric field through a π-π stacking alignment of the pendant aromatic groups. These results with both PhOLEDs and memory devices demonstrate that this oligosiloxane-mCP hybrid structure is promising and versatile for high performance solution-processed optoelectronic applications.