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首页> 外文期刊>Organic Electronics >Improving color stability of blue/orange complementary white OLEDs by using single-host double-emissive layer structure: Comprehensive experimental investigation into the device working mechanism
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Improving color stability of blue/orange complementary white OLEDs by using single-host double-emissive layer structure: Comprehensive experimental investigation into the device working mechanism

机译：通过使用单主体双发射层结构提高蓝/橙色互补白OLED的颜色稳定性：对器件工作机理的综合实验研究

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摘要

In this paper, we successfully improved the spectral stability in blue/orange complementary white organic light-emitting diodes (OLEDs) by utilizing hole-type single host double emissive layer structure. The demonstrated double emissive layer structure effectively suppresses the direct recombination of electron-hole pairs on the hole-trapping orange phosphor and thus reduces the deteriorated effect of charge trapping on electroluminescence spectrum stability by controlling exciton recombination zone. It is shown that the white light emission is a cascade energy transfer process from host to blue phosphor and then to orange phosphor, which seems to be less affected by the driving conditions. Thus, the change in Commission Internationale de L'Eclairage coordinates (CIE) in the white OLEDs is less than (±0.010, ±0.007) as the voltage increases from 4 V to 9 V, which correspond to the luminance increasing from 200 cd m~(-2) to about 20,000 cd m~(-2). This is superior to that of co-doped single emissive layer devices, which show much larger CIEs variation of (±0.05, ±0.02) in the same driving voltage range. We gave detailed analysis on the exciton recombination processes and well elucidated the working mechanism of the fabricated double emissive layer structure white OLEDs.
机译：在本文中，我们通过利用孔型单主体双发射层结构成功地提高了蓝/橙互补白色有机发光二极管（OLED）的光谱稳定性。所展示的双发射层结构有效地抑制了电子-空穴对在俘获橙色荧光体上的直接复合，从而通过控制激子复合区而减少了电荷俘获对电致发光光谱稳定性的恶化影响。结果表明，白光发射是从主体到蓝色磷光体再到橙色磷光体的级联能量转移过程，似乎不受驱动条件的影响。因此，随着电压从4 V增加到9 V，白色OLED中的国际照明委员会坐标（CIE）的变化小于（±0.010，±0.007），这对应于亮度从200 cd m 〜（-2）至约20,000 cd m〜（-2）。这优于共掺杂的单发射层器件，后者在相同的驱动电压范围内显示出更大的CIE变化（±0.05，±0.02）。我们对激子复合过程进行了详细分析，并很好地阐明了制造的双发光层结构白色OLED的工作机理。

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  • 来源
    《Organic Electronics》 |2012年第8期|p.1340-1348|共9页
  • 作者

    Yongbiao Zhao; Liping Zhu; Jiangshan Chen; Dongge Ma;

  • 作者单位

    State Key Laboratory of Polymer Physics and Chemistry, Changchurt Institute of Applied Chemistry, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People's Republic of China;

    State Key Laboratory of Polymer Physics and Chemistry, Changchurt Institute of Applied Chemistry, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People's Republic of China;

    State Key Laboratory of Polymer Physics and Chemistry, Changchurt Institute of Applied Chemistry, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People's Republic of China;

    State Key Laboratory of Polymer Physics and Chemistry, Changchurt Institute of Applied Chemistry, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    organic light emitting diode; color stability; double emissive layer; white;

    机译：有机发光二极管;颜色稳定性;双发射层;白色;

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