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Enhanced light out-coupling efficiency and reduced efficiency roll-off in phosphorescent OLEDs with a spontaneously distributed embossed structure formed by a spin-coating method

机译:通过自旋涂布方法形成的自发分布的压花结构,增强了光外耦合效率和降低效率折衷的磷光果实

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摘要

A simple and low-cost spin-coating method was proposed to form a spontaneously distributed embossed structure. With such an embossed structure produced by Al2O3 nanospheres (NPs) with different diameters, the out-coupling efficiency is increased in all viewing directions without introducing significant spectral changes and the efficiency roll-off is suppressed at the same time. When the concentration of Al2O3 ethanol solution is chosen as 0.08 mg ml(-1), a peak current efficiency (CE) of 52.1 cd A(-1), peak power efficiency (PE) of32.7 l m W-1, and peak external quantum efficiency (EQE) of 20.9% are obtained. From the maximum efficiency value to the case where the brightness is 3000 cd m(-2), the roll-off of CE, PE and EQE for device B are only 6.53%, 26.30% and 6.22%, respectively. The improved properties are attributed to greatly enhanced light extraction and an enlarged charge carrier recombination region.
机译:提出了一种简单而低成本的旋涂方法,形成自发分布的压花结构。 通过使用不同直径的Al2O3纳米球(NPS)产生的这种压花结构,在所有观察方向上增加外耦合效率而不引入显着的光谱变化,并且同时抑制效率滚动。 When the concentration of Al2O3 ethanol solution is chosen as 0.08 mg ml(-1), a peak current efficiency (CE) of 52.1 cd A(-1), peak power efficiency (PE) of32.7 lm W-1, and peak 获得20.9%的外量子效率(EQE)。 从最大效率值到亮度为3000cd m(-2)的情况下,用于器件B的CE,PE和EQE的滚动分别仅为6.53%,26.30%和6.22%。 改进的性质归因于大大增强的光提取和扩大的电荷载体重组区域。

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  • 来源
    《RSC Advances》 |2017年第69期|共7页
  • 作者单位

    Taiyuan Univ Technol Coll Phys &

    Optoelect Key Lab Adv Transducers &

    Intelligent Control Sys Minist Educ Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Phys &

    Optoelect Key Lab Adv Transducers &

    Intelligent Control Sys Minist Educ Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Key Lab Interface Sci &

    Engn Adv Mat Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Phys &

    Optoelect Key Lab Adv Transducers &

    Intelligent Control Sys Minist Educ Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Phys &

    Optoelect Key Lab Adv Transducers &

    Intelligent Control Sys Minist Educ Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Coll Phys &

    Optoelect Key Lab Adv Transducers &

    Intelligent Control Sys Minist Educ Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Key Lab Interface Sci &

    Engn Adv Mat Taiyuan 030024 Shanxi Peoples R China;

    Taiyuan Univ Technol Key Lab Interface Sci &

    Engn Adv Mat Taiyuan 030024 Shanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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