High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)
High brightness deep blue/violet fluorescent polymer light-emitting diodes (PLEDs)
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DOI：
10.1039/c5tc02162f
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发表时间：
2015-09
影响因子：
6.4
通讯作者：
Javan H. Cook;Jose Santos;H. Al-Attar;M. Bryce;A. Monkman
中科院分区：
文献类型：
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作者：
Javan H. Cook;Jose Santos;H. Al-Attar;M. Bryce;A. Monkman
合成了两种新的深蓝色/紫色交替发光的共聚物，包括容易获得的咔唑（C）和芴（F）单体单元，并显示出产生具有结构ITO/PEDOT：PSS/聚合物/TPBi/LiF/Al的极亮的溶液处理聚合物发光二极管（PLED）。对位共轭聚合物CF 1产生的PLED器件的外量子效率（EQE）值为ηext，max 1.4%，Lmax为565 cd m−2，CIEx，y（0.16，0.07）。在添加TAPC空穴注入层之后，EQE提高至ηext，最大2.1%。对于同分异构的间位共轭聚合物CF 2，获得ηext，max 0.35%，Lmax为16 cd m−2，CIEx，y（0.18，0.12）。CF 1和CF 2器件的λ EL max均为409 nm。对于这种高亮度的器件，CF 1器件还具有低导通电压和低工作电压。此外，CF 1的发射从10 cd m−2到峰值亮度都非常稳定，CIE坐标的偏移可以忽略不计。使用容易获得的单体单元合成的简单共聚物结构与来自简单器件架构的高亮度和良好颜色稳定性的组合使得CF 1适合于需要深蓝色/紫色发射的广泛应用。
Two new deep blue/violet emitting alternating co-polymers, comprising readily-available carbazole (C) and fluorene (F) monomer units, have been synthesised and shown to produce extremely bright solution-processed polymer light-emitting diodes (PLEDs) with the structure ITO/PEDOT:PSS/polymer/TPBi/LiF/Al. The para-conjugated polymer, CF1, gave PLED devices with external quantum efficiency (EQE) values of ηext,max 1.4%, Lmax of 565 cd m−2 with CIEx,y (0.16, 0.07). The EQE was raised to ηext,max 2.1%, after the addition of a TAPC hole injection layer. For the isomeric meta-conjugated polymer, CF2, values of ηext,max 0.35%, Lmax of 16 cd m−2 with CIEx,y (0.18, 0.12) were obtained. The λELmax was 409 nm for both the CF1 and CF2 devices. The CF1 devices also possess low turn-on and low operating voltages for devices of such high brightness. Moreover, the CF1 emission is very stable from 10 cd m−2 up to peak brightness, with only a negligible shift in CIE coordinates. The combination of a simple co-polymer structure synthesised using readily-available monomer units, and high brightness and good colour stability from a simple device architecture, makes CF1 suitable for a wide range of applications requiring deep blue/violet emission.