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首页> 外文期刊>Advanced Functional Materials >The Root Causes of the Limited Stability of Solution-Coated Small-Molecule Organic Light-Emitting Devices: Faster Host Aggregation by Exciton-Polaron Interactions
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The Root Causes of the Limited Stability of Solution-Coated Small-Molecule Organic Light-Emitting Devices: Faster Host Aggregation by Exciton-Polaron Interactions

机译：溶液包被的小分子有机发光器件有限稳定性的根本原因：通过激子-极化子相互作用更快地聚集宿主

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摘要

The degradation mechanism is compared in organic light-emitting devices (OLEDs) fabricated by solution-coating to that in vacuum-deposited OLEDs. Devices comprising various host materials made by vacuum-deposition or solution-coating are investigated. Changes in devices electroluminescence (EL) spectra during prolonged electrical driving are compared and analyzed. Hole-only devices are also utilized, and employed to study the effects of charges and excitons, separately and combined. The results reveal that the faster degradation of solution-processed devices relative to their vacuum-deposited counterparts under electrical stress is due to a faster aggregation of the host materials. Interactions between excitons and polarons in the emitting layers of the devices induce this aggregation phenomenon. Although this phenomenon affects both vacuum-deposited and solution-coated emitting layers, it is found to occur much faster in the later. The findings shed light on the root causes of the limited stability of solution-processed OLEDs.
机译：将通过溶液涂覆制造的有机发光器件（OLED）中的降解机理与真空沉积的OLED中的降解机理进行了比较。研究了包括通过真空沉积或溶液涂覆制成的各种主体材料的器件。比较并分析了长时间电驱动过程中器件电致发光（EL）光谱的变化。还使用仅空穴的装置，并将其单独和组合用于研究电荷和激子的影响。结果表明，在电应力下，固溶处理过的器件相对于其真空沉积的对应物而言，降解更快，这是由于主体材料的聚集更快。器件的发射层中激子和极化子之间的相互作用会引起这种聚集现象。尽管该现象影响真空沉积的和涂覆溶液的发射层，但发现在随后发生的速度要快得多。这些发现揭示了溶液处理的OLED稳定性有限的根本原因。

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  • 来源
    《Advanced Functional Materials》 |2016年第47期|8662-8669|共8页
  • 作者

    Cho Yong Joo; Zhang Yingjie; Yu Hyeonghwa; Aziz Hany;

  • 作者单位

    Univ Waterloo, Waterloo Inst Nanotechnol, Dept Elect & Comp Engn, Waterloo, ON, Canada;

    Univ Waterloo, Waterloo Inst Nanotechnol, Dept Elect & Comp Engn, Waterloo, ON, Canada;

    Univ Waterloo, Waterloo Inst Nanotechnol, Dept Elect & Comp Engn, Waterloo, ON, Canada;

    Univ Waterloo, Waterloo Inst Nanotechnol, Dept Elect & Comp Engn, Waterloo, ON, Canada;

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