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首页> 外文期刊>Advanced Functional Materials >Barium Hydroxide as an Interlayer Between Zinc Oxide and a Luminescent Conjugated Polymer for Light-Emitting Diodes
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Barium Hydroxide as an Interlayer Between Zinc Oxide and a Luminescent Conjugated Polymer for Light-Emitting Diodes

机译：氢氧化钡作为氧化锌和发光二极管的发光共轭聚合物之间的中间层

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摘要

A study of hybrid light-emitting diodes (HyLEDs) fabricated with and without solution-processible Cs_2CO_3 and Ba(OH)_2 inorganic interlayers is presented. The interlayers are deposited between a zinc oxide electron-injection layer and a fluorescent emissive polymer poly(9-dioctyl fluorine-alt-benzothiadiazole) (F8BT) layer, with a thermally evaporated MoO_3/Au layer used as top anode contact. In comparison to Cs_2CO_3, the Ba(OH)_2 interlayer shows improved charge carrier balance in bipolar devices and reduced exciton quenching in photoiuminance studies at the ZnO/Ba(OH)_2/F8BT interface compared to the Cs_2CO_3 interlayer. A luminance efficiency of≈28 cd A~(-1) (external quantum efficiency (EQE) ≈ 9%) is achieved for ≈1.2 μm thick single F8BT layer based HyLEDs. Enhanced out-coupling with the aid of a hemispherical lens allows further efficiency improvement by a factor of 1.7, increasing the luminance efficiency to ≈47cd A~(-1), corresponding to an EQE of 15%. The photovoltaic response of these structures is also studied to gain an insight into the effects of interfacial properties on the photoinduced charge generation and back-recombination, which reveal that Ba(OH)_2 acts as better hole blocking layer than the Cs_2CO_3 interlayer.
机译：提出了一种具有和不具有可溶液处理的Cs_2CO_3和Ba（OH）_2无机中间层的混合发光二极管（HyLED）的研究。中间层沉积在氧化锌电子注入层和荧光发射聚合物聚（9-二辛基氟-alt-苯并噻二唑）（F8BT）层之间，热蒸发的MoO_3 / Au层用作顶部阳极触点。与Cs_2CO_3相比，与Cs_2CO_3中间层相比，Ba（OH）_2中间层在双极型器件中显示出改善的电荷载流子平衡，并在ZnO / Ba（OH）_2 / F8BT界面的光致发光研究中减少了激子猝灭。对于基于≈1.2μm厚的单个F8BT层的HyLED，可实现≈28cd A〜（-1）的亮度效率（外部量子效率（EQE）≈9％）。借助半球透镜增强的输出耦合使效率进一步提高了1.7倍，从而将亮度效率提高到≈47cdA〜（-1），相当于15％的EQE。还研究了这些结构的光电响应，以深入了解界面性质对光诱导电荷产生和反向复合的影响，这表明Ba（OH）_2比Cs_2CO_3中间层更好地充当空穴阻挡层。

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  • 来源
    《Advanced Functional Materials》 |2012年第19期|4165-4171|共7页
  • 作者

    Li Ping Lu; Dinesh Kabra; Richard H. Friend;

  • 作者单位

    Cavendish Laboratory JJ Thomson Avenue, Cambridge, CB3 OHE, UK;

    Cavendish Laboratory JJ Thomson Avenue, Cambridge, CB3 OHE, UK;

    Cavendish Laboratory JJ Thomson Avenue, Cambridge, CB3 OHE, UK;

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