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Growth mechanism of NPD crystal from amorphous thin film by observation of morphology and measuring growth rate

机译:通过形态学观察和测量生长速率从非晶薄膜中NPD晶体的生长机理

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摘要

Crystallization in organic amorphous thin films causes degradation of organic light-emitting devices. Crystallization of N'-di-1-naphthyl-N,N'-diphenylbenzidine (alpha-NPD) thin films occurs by the migration of NPD molecules on a substrate. In this study, we investigated the kinetic process of the crystallization of alpha-NPD in amorphous thin films by comparing the growth rate with the morphology of NPD crystals. The growth rate of NPD crystals was changed indicating different kinetic processes. The observation of a depression zone formed around a single fibril crystal revealed that the depression zone was formed only at the side of the fibril crystal, not at the tip of the fibril crystal in thinner films. This shows that NPD molecules were transferred directly from the amorphous region to the tip of the fibril crystal. After the crystalline region became dense by the growth and divergence of fibril crystals, the circular crystalline region was expanded by two-dimensional diffusion-limited growth. (C) 2020 The Japan Society of Applied Physics
机译:有机非晶薄膜中的结晶导致有机发光器件的降解。通过NPD分子在基材上的迁移发生N'-DI-1-萘基-N,N'-二苯基苯甲酰(α-NPD)薄膜的结晶。在这项研究中,通过将生长速率与NPD晶体形态进行比较,研究了在无定形薄膜中α-NPD结晶的动力学过程。改变了NPD晶体的生长速率,表明不同的动力学过程。观察围绕单个原纤维晶体形成的凹陷区显示凹陷区仅在原纤维晶体的侧面形成,而不是在较薄的膜中的纤维晶尖端形成。这表明将NPD分子直接从非晶区域转移到原纤维晶体的尖端。在晶体区域被纤维晶体的生长和发散变得密集之后,通过二维扩散限制的生长膨胀圆形晶体区域。 (c)2020日本应用物理学会

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  • 来源
    《Japanese journal of applied physics》 |2020年第sn期|SN1015.1-SN1015.6|共6页
  • 作者单位

    Univ Ritsumeikan Fac Sci & Engn Dept Phys Sci Kusatsu Shiga 5258577 Japan;

    Univ Ritsumeikan Fac Sci & Engn Dept Phys Sci Kusatsu Shiga 5258577 Japan;

    Osaka Univ Inst Sci & Ind Res Osaka 5670047 Japan;

    Univ Ritsumeikan Fac Sci & Engn Dept Phys Sci Kusatsu Shiga 5258577 Japan;

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