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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Efficient pure-red perovskite light-emitting diodes using dual-Lewis-base molecules for interfacial modification
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Efficient pure-red perovskite light-emitting diodes using dual-Lewis-base molecules for interfacial modification

机译：高效纯红色钙钛矿发光二极管，使用双路易斯基础分子进行界面改性

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摘要

Perovskite light-emitting diodes (PeLEDs) are promising for full-color displays due to their high color purity, low-cost and solution processability. However, pure-red PeLEDs still lag behind their green and deep-red counterparts in efficiency and brightness. Here, we employ three structurally similar dual-Lewis-base molecules ethylenediamine, ethanolamine and beta-alanine to modify the interface between the hole transport layer (HTL) and (Cs/K/PEA)PbI3-xBrx perovskite layer for efficient pure-red PeLEDs. The functional groups in these molecules can enhance the hydrophilicity on the surface of the HTL, which improves the perovskite film quality and inhibits the formation of unfavorable low-order (n = 1 and n = 2) phases. Besides, amino groups can coordinate with interfacial defects. In particular, ethanolamine and beta-alanine enable the strong film growth modulation and passivation effect due to the presence of hydroxyl and carboxyl groups. The perovskites based on ethanolamine and beta-alanine interfacial modification give rise to enhanced photoluminescence quantum yields of up to 36.5% and 34.4%, respectively. Consequently, the optimal PeLEDs achieve a pure-red emission at 634 nm with a maximum luminance of 9218 cd m(-2) and a peak external quantum efficiency of 5.27%.
机译：钙钛矿型发光二极管（PELED）由于其高色纯度、低成本和溶液可加工性，在全彩色显示器中具有广阔的应用前景。然而，纯红色毛皮在效率和亮度方面仍然落后于绿色和深红色毛皮。在这里，我们使用三种结构相似的双路易斯碱分子乙二胺、乙醇胺和β-丙氨酸来修饰空穴传输层（HTL）和（Cs/K/PEA）PbI3-xBrx钙钛矿层之间的界面，以获得高效的纯红色毛皮。这些分子中的官能团可以增强HTL表面的亲水性，从而改善钙钛矿薄膜的质量，抑制不利的低阶（n=1和n=2）相的形成。此外，氨基可以与界面缺陷相协调。特别是，由于羟基和羧基的存在，乙醇胺和β-丙氨酸能够实现强烈的薄膜生长调节和钝化效果。基于乙醇胺和β-丙氨酸界面修饰的钙钛矿分别提高了36.5%和34.4%的光致发光量子产率。因此，最佳PELED在634nm处实现纯红色发射，最大亮度为9218cd m（-2），峰值外部量子效率为5.27%。

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    Yang Rui; Li Yan-Qing; Guo Ming-Lei; Cai Xiao-Yi; Tang Jian-Xin;

  • 作者单位

    Soochow Univ Jiangsu Key Lab Carbon Based Funct Mat &

    Devices Inst Funct Nano &

    Soft Mat FUNSOM Suzhou 215123 Peoples R China;

    East China Normal Univ Minist Educ Nanophoton &

    Adv Instrument Engn Res Ctr Sch Phys &

    Elect Sci Shanghai 200062 Peoples R China;

    Soochow Univ Jiangsu Key Lab Carbon Based Funct Mat &

    Devices Inst Funct Nano &

    Soft Mat FUNSOM Suzhou 215123 Peoples R China;

    Soochow Univ Jiangsu Key Lab Carbon Based Funct Mat &

    Devices Inst Funct Nano &

    Soft Mat FUNSOM Suzhou 215123 Peoples R China;

    Soochow Univ Jiangsu Key Lab Carbon Based Funct Mat &

    Devices Inst Funct Nano &

    Soft Mat FUNSOM Suzhou 215123 Peoples R China;

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  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
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