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首页> 外文期刊>Advanced Functional Materials >Efficient Ruddlesden-Popper Perovskite Light-Emitting Diodes with Randomly Oriented Nanocrystals
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Efficient Ruddlesden-Popper Perovskite Light-Emitting Diodes with Randomly Oriented Nanocrystals

机译：具有随机取向的纳米晶体的高效Ruddlesden-Pop钙钛矿发光二极管

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摘要

Ruddlesden-Popper phase (RP-phase) perovskites that consist of 2D perovskite slabs interleaved with bulky organic ammonium (OA) are favorable for light-emitting diodes (LEDs). The critical limitation of LED applications is that the insulating OA arranged in a preferred orientation limits charge transport. Therefore, the ideal solution is to achieve a randomly connected structure that can improve charge transport without hampering the confinement of the electron-hole pair. Here, a structurally modulated RP-phase metal halide perovskite (MHP), (PEA)(2)(CH3NH3)(m-1)PbmBr3m+1 is introduced to make the randomly oriented RP-phase unit and ensure good connection between them by applying modified nanocrystal pinning, which leads to an increase in the efficiency of perovskite LEDs (PeLEDs). The randomly connected RP-phase MHP forces contact between inorganic layers and thereby yields efficient charge transport and radiative recombination. Combined with an optimal dimensionality, (PEA)(2)(CH3NH3)(2)Pb3Br10, the structurally modulated RP-phase MHP exhibits increased photoluminescence quantum efficiency, from 0.35% to 30.3%, and their PeLEDs show a 2,018 times higher current efficiency (20.18 cd A(-1)) than in the 2D PeLED (0.01 cd A(-1)) and 673 times than in the 3D PeLED (0.03 cd A(-1)) using the same film formation process. This approach provides insight on how to solve the limitation of RP-phase MHP for efficient PeLEDs.
机译：由2D钙钛矿板与大块有机铵（OA）交错而成的Ruddlesden-Popper相（RP相）钙钛矿非常适合用于发光二极管（LED）。 LED应用的关键限制在于，以优选的取向布置的绝缘OA限制了电荷传输。因此，理想的解决方案是获得一种随机连接的结构，该结构可以在不妨碍电子-空穴对约束的情况下改善电荷传输。在这里，引入结构调制的RP相金属卤化物钙钛矿（MHP），（PEA）（2）（CH3NH3）（m-1）PbmBr3m + 1来制造无规取向的RP相单元并确保它们之间的良好连接应用改良的纳米晶钉扎技术，可提高钙钛矿LED（PeLED）的效率。随机连接的RP相MHP迫使无机层之间接触，从而产生有效的电荷传输和辐射复合。结合最佳尺寸（PEA）（2）（CH3NH3）（2）Pb3Br10，结构调制的RP相MHP的光致发光量子效率从0.35％增至30.3％，并且其PeLED的电流效率提高了2018倍使用相同的成膜工艺，其亮度（20.18 cd A（-1））比2D PeLED（0.01 cd A（-1））和673倍（3d PeLED（0.03 cd A（-1）））。这种方法提供了有关如何解决有效PeLED的RP相MHP局限性的见识。

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  • 来源
    《Advanced Functional Materials》 |2019年第27期|1901225.1-1901225.9|共9页
  • 作者

    Lee Hyeon-Dong; Kim Hobeom; Cho Himchan; Cha Wonhee; Hong Yongseok; Kim Young-Hoon; Sadhanala Aditya; Venugopalan Vijay; Kim Joo Sung; Choi Jin Woo; Lee Chang-Lyoul; Kim Dongho; Yang Hoichang; Friend Richard H.; Lee Tae-Woo;

  • 作者单位

    Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea;

    Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea;

    Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea;

    Yonsei Univ, Dept Chem, 50 Yonsei Ro, Seoul 03722, South Korea;

    Yonsei Univ, Dept Chem, 50 Yonsei Ro, Seoul 03722, South Korea;

    Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea;

    Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England;

    Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England;

    Seoul Natl Univ, Dept Mat Sci & Engn, 1 Gwanak Ro, Seoul 08826, South Korea;

    GIST, APRI, 123 Cheomdangwagi Ro, Gwangju 61005, South Korea;

    GIST, APRI, 123 Cheomdangwagi Ro, Gwangju 61005, South Korea;

    Yonsei Univ, Dept Chem, 50 Yonsei Ro, Seoul 03722, South Korea;

    Inha Univ, Dept Chem Engn, 100 Inha Ro, Incheon 22212, South Korea;

    Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England;

    Seoul Natl Univ, Plus SNU Mat Div Educating Creat Global Leaders, Dept Mat Sci & Engn, Inst Engn Res,Res Inst Adv Mat,NSI, 1 Gwanak Ro, Seoul 08826, South Korea;

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  • 正文语种 eng
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  • 关键词

    carrier transport; nanocrystal orientation; nanocrystal pinning; quasi-2D perovskite; structural modulation;

    机译：载流子传输;纳米晶取向;纳米晶钉扎;准二维钙钛矿;结构调制;

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