Light-emitting electrochemical cells using polymeric ionic liquid/polyfluorene blends as luminescent material
Light-emitting electrochemical cells using polymeric ionic liquid/polyfluorene blends as luminescent material
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DOI：
10.1063/1.3279155
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发表时间：
2010-01-25
影响因子：
4
通讯作者：
Cacialli, Franco
中科院分区：
文献类型：
--
作者：
Marcilla, Rebeca;Mecerreyes, David;Cacialli, Franco
我们报道了使用由聚（9，9（'）-二辛基芴-alt-苯并噻二唑）（F8 BT）和聚合物离子液体（PIL）（聚（乙烯基-乙基咪唑双三氟甲烷磺酰亚胺））组成的共混物作为具有简单的铟锡氧化物/活性层/Al配置的发光电化学电池（LEC）的活性层。PIL提供了器件作为LEC操作所需的离子电荷和传输通道，从而降低了电极/活性层界面处的电荷注入势垒。我们发现，使用PIL：F8 BT共混物的器件的性能相对于纯F8 BT有所改善，最大亮度从纯F8 BT的10-20 cd/m2增加到共混物的2000-4000 cd/m2。开启电压也从高于7V降低到约3.6- 4V。最大外量子效率从10（-3）%-10（-4）%增加到高于0.1%的值。
We report the use of blends composed of poly(9,9(')-dioctylfluorene-alt-benzothiadiazole), F8BT, and a polymeric ionic liquid (PIL), poly(vinyl-ethylimidazolium bistrifluoromethanesulfonimide), as the active layer in light-emitting electrochemical cells (LECs) with the simple indium-tin-oxide/active-layer/Al configuration. The PIL provides both the ionic charge and the transport channel necessary for the devices to operate as LECs resulting in reduction of charge injection barriers at the electrode/active-layer interfaces. We find that the performance of devices using PIL:F8BT blends improved with respect to pure F8BT with maximum luminance increasing from 10-20 cd/m(2) for pure F8BT to 2000-4000 cd/m(2) for blends. Turn-on voltages were also reduced from above 7 V down to around 3.6-4 V. The maximum external quantum efficiency was increased from 10(-3)%-10(-4)% to values higher than 0.1%.