Syntheses and properties of electroluminescent polyfluorene-based conjugated polymers, containing oxadiazole and carbazole units as pendants, for LEDs
Syntheses and properties of electroluminescent polyfluorene-based conjugated polymers, containing oxadiazole and carbazole units as pendants, for LEDs
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DOI：
10.1016/j.polymer.2005.10.080
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发表时间：
2005-12
期刊：
影响因子：
4.6
通讯作者：
Youngeup Jin;Jin Young Kim;S. Park;Jinwoo Kim;Sungeun Lee;Kwanghee Lee;H. Suh
中科院分区：
文献类型：
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作者：
Youngeup Jin;Jin Young Kim;S. Park;Jinwoo Kim;Sungeun Lee;Kwanghee Lee;H. Suh
合成了含有恶二唑和咔唑基团的新型聚荧烯共轭聚合物作为发光二极管的电致发光层，结果表明，与聚(2，7-(9，9-二(2-乙基己基)荧烯))(PF2/6)相比，大多数聚合物具有更高的最大亮度和电致发光效率。所制备的聚合物poly[(9-(6-(N-carbazolyl)-hexyl)-9-hexyl)-fluorene-2，7-diyl]-co-[(9-hexyl-9-(6-(4-(5-phenyl-1，3，4-oxadiazolyl)-phenoxy)-hexyl)-fluorene-2，7-diyl)](Oxd-PF-co-Cz-PF)可溶于常见有机溶剂，并用作双层发光二极管的电致发光层。所有聚合物在λmax=430 nm(激发波长，370 nm)附近显示光致发光，在λmax=426 nm附近显示蓝色EL。聚合物的电流-电压-亮度(I-V-L)特性显示，开启电压为3.5-5.5V，低于Pf2/6。ITO/PEDOT/聚合物/Al结构的器件在10V时的最大亮度为3000cd/m2，在10.6 mA/cm2时的最大电致发光效率为2.13cd/A，均高于Pf2/6。
New polyfluorenes (PF)-based conjugated copolymers, containing oxadiazole and carbazole units as pendants, were prepared as the electroluminescent (EL) layer in light-emitting diodes (LEDs) to show that most of them have higher maximum brightness and EL efficiency as compared to poly(2,7-(9,9-bis(2-ethylhexyl)fluorene)) (PF2/6). The prepared polymers, poly[(9-(6-(N-carbazolyl)-hexyl)-9-hexyl)-fluorene-2,7-diyl]-co-[(9-hexyl-9-(6-(4-(5-phenyl-1,3,4-oxadiazolyl)-phenoxy)-hexyl)-fluorene-2,7-diyl)] (Oxd-PF-co-Cz-PF), were soluble in common organic solvents and used as the EL layer in double layer light-emitting diodes (LEDs) (ITO/PEDOT/polymer/Al). All polymers show photoluminescence around λmax=430nm (exciting wavelength, 370nm) and blue EL around λmax=426nm. The current–voltage–luminance (I–V–L) characteristics of the polymers show turn-on voltages of 3.5–5.5V which are lower than that of PF2/6. The maximum brightness and EL efficiency of the device with the configuration of ITO/PEDOT/polymer/Al were 3000cd/m2at 10V and 2.13cd/A at 10.6mA/cm2, respectively, which are all higher than those of PF2/6.