Charge carrier mobility in blue-green emitting fluorenyl-substituted poly(p-phenylene vinylene)s
Charge carrier mobility in blue-green emitting fluorenyl-substituted poly(p-phenylene vinylene)s
复制标题
发射蓝绿光的芴基取代聚（对亚苯基亚乙烯基）中的载流子迁移率
DOI：
10.1063/1.1650918
复制
发表时间：
2004
影响因子：
3.2
通讯作者：
T. Tsutsui
中科院分区：
文献类型：
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作者：
S. H. Lee;T. Yasuda;T. Tsutsui
用飞行时间法测量了三种蓝绿色发光共轭聚合物聚[2-(9‘，9’-二己基荧基)-1，4-亚苯基](DHF-PPV)、聚[2-(7‘-甲氧基-9’，9‘-二己基-亚甲基)-1，4-亚苯基](MDHF-PPV)和聚[2-(7’-氰基-9‘，9’-二己基-1，4-亚苯基)](CNDHF-PPV)的载流子迁移率。在2.5×10~5−V/cm的电场下，观察到了室温空穴迁移率为4.5×10~5 ~4 /vs的色散载流子输运。在相同的电场下，这种迁移率比poly[2-methoxy-5-(2′-ethylhexyloxy)-1，4-phenylene乙烯的迁移率高两个数量级。在298K和2.5×10~5−V/cm的电场下，引入电子供给基和电子吸电子基团使空穴迁移率分别降低到1.1×10~4 /vs和4.1×10~5−7 ~2/vs。这些结果表明，D中的PPV主链和荧侧基团都是由基团组成的。
The charge carrier mobility in three blue-green emitting conjugated polymers, poly[2-(9′,9′-dihexylfluorenyl)-1,4-phenylene vinylene] (DHF-PPV), poly[2-(7′-methoxy-9′,9′ -dihexylfluorenyl)-1,4-phenylene vinylene] (MDHF-PPV), and poly[2-(7′-cyano-9′,9′ -dihexylfluorenyl)-1,4-phenylene vinylene] (CNDHF-PPV) was measured using the time-of-flight technique. We observed dispersive charge carrier transport in DHF-PPV with a room-temperature hole mobility of 4.5×10−4 cm2/Vs at an electric field of 2.5×105 V/cm. This mobility is two orders of magnitude higher than that of poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] at the same electric field. The introduction of an electron donating or an electron withdrawing group to fluorene unit in DHF-PPVs resulted in a decrease in the hole mobilities to 1.1×10−4 cm2/Vs for MDHF-PPV and 4.1×10−7 cm2/Vs for CNDHF-PPV at 298 K and an electric field of 2.5×105 V/cm, respectively. These results demonstrate that both the PPV backbone and the fluorene side unit in D...