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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Improvement of luminescence efficiency by electrical annealing in single-layer organic light-emitting diodes based on a conjugated dendrimer
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Improvement of luminescence efficiency by electrical annealing in single-layer organic light-emitting diodes based on a conjugated dendrimer

机译：通过基于共轭树枝状聚合物的单层有机发光二极管中的电退火来提高发光效率

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In this paper, we study the effects of electrical annealing at different voltages on the performance of organic light-emitting diodes. The light-emitting diodes studied here are single-layer devices based on a conjugated dendrimer doped with 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole as the emissive layer. We find that these devices can be annealed electrically by applying a voltage. This process reduces the turn-on voltage and enhances the brightness and efficiency. We obtained an external electroluminescence quantum efficiency of 0.07% photon/electron and a brightness of 2900 cd m(-2) after 12.4 V electrical annealing, which are about 6 times and 9 times higher than un-annealing devices, respectively. The improved luminance and efficiency are attributed to the presence of a space charge field near the electrodes caused by charging of traps. [References: 37]
机译：在本文中，我们研究了不同电压下的电退火对有机发光二极管性能的影响。这里研究的发光二极管是基于共轭树枝状聚合物的单层器件，该共轭树枝状聚合物掺杂有2-（4-联苯基）-5-（4-叔丁基苯基）-1,3,4-恶二唑作为发光层。我们发现这些设备可以通过施加电压进行电退火。该过程降低了导通电压并提高了亮度和效率。在12.4 V电退火之后，我们获得了0.07％光子/电子的外部电致发光量子效率和2900 cd m（-2）的亮度，分别比未退火的器件高6倍和9倍。亮度和效率的提高归因于由陷阱的电荷引起的电极附近空间电荷场的存在。 [参考：37]

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