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首页> 外文期刊>Advanced Functional Materials >Amine-Free Synthesis of Cesium Lead Halide Perovskite Quantum Dots for Efficient Light-Emitting Diodes
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Amine-Free Synthesis of Cesium Lead Halide Perovskite Quantum Dots for Efficient Light-Emitting Diodes

机译：高效发光二极管无卤化铯铅钙钛矿量子点的合成

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摘要

Cesium lead halide perovskite quantum dots (PQDs) have attracted significant interest for optoelectronic applications in view of their high brightness and narrow emission linewidth at visible wavelengths. A remaining challenge is the degradation of PQDs during purification from the synthesis solution. This is attributed to proton transfer between oleic acid and oleylamine surface capping agents that leads to facile ligand loss. Here, a new synthetic method is reported that enhances the colloidal stability of PQDs by capping them solely using oleic acid (OA). Quaternary alkylammonium halides are used as precursors, eliminating the need for oleylamine. This strategy enhances the colloidal stability of OA capped PQDs during purification, allowing us to remove excess organic content in thin films. Inverted red, green, and blue PQD light-emitting diodes (LED) are fabricated for the first time with solution-processed polymer-based hole transport layers due to higher robustness of OA capped PQDs to solution processing. The blue and green LEDs exhibit threefold and tenfold improved external quantum efficiency (EQE), respectively, compared to prior related reports for amine/ammonium capped cross-linked PQDs. The brightest blue LED based on all inorganic CsPb(Br1-xClx)(3) PQDs is also reported.
机译：卤化铯铅钙钛矿量子点（PQD）鉴于其在可见光波长下的高亮度和窄发射线宽，已引起了光电应用的极大兴趣。剩下的挑战是从合成溶液中纯化过程中PQD的降解。这归因于油酸和油胺表面封端剂之间的质子转移，这导致容易的配体损失。在此，报道了一种新的合成方法，该方法通过仅使用油酸（OA）封端来增强PQD的胶体稳定性。季烷基卤化铵被用作前体，从而消除了对油胺的需求。此策略可增强纯化过程中OA封端的PQD的胶体稳定性，使我们能够去除薄膜中多余的有机物。倒装的红色，绿色和蓝色PQD发光二极管（LED）首次使用溶液处理的基于聚合物的空穴传输层制造，这是因为OA封端的PQD对溶液处理具有更高的耐用性。与先前有关胺/铵封端的交联PQD的相关报道相比，蓝色和绿色LED的外部量子效率（EQE）分别提高了三倍和十倍。还报告了基于所有无机CsPb（Br1-xClx）（3）PQD的最亮蓝色LED。

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  • 来源
    《Advanced Functional Materials》 |2016年第47期|8757-8763|共7页
  • 作者

    Yassitepe Emre; Yang Zhenyu; Voznyy Oleksandr; Kim Younghoon; Walters Grant; Castaneda Juan Andres; Kanjanaboos Pongsakorn; Yuan Mingjian; Gong Xiwen; Fan Fengjia; Pan Jun; Hoogland Sjoerd; Comin Riccardo; Bakr Osman M.; Padilha Lazaro A.; Nogueira Ana F.; Sargent Edward H.;

  • 作者单位

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada|Univ Estadual Campinas UNICAMP, Inst Quim, Caixa Postal 6154, BR-13083970 Campinas, SP, Brazil;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    Univ Estadual Campinas, Inst Fis Gleb Wataghin, POB 6165, BR-13083859 Sao Paulo, Brazil;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada|Mahidol Univ, Mat Sci & Engn, Fac Sci, 272 Rama 6 Rd, Bangkok 10400, Thailand;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    King Abdullah Univ Sci & Technol KAUST, Solar & Photovolta Engn Res Ctr, Thuwal 239556900, Saudi Arabia;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

    King Abdullah Univ Sci & Technol KAUST, Solar & Photovolta Engn Res Ctr, Thuwal 239556900, Saudi Arabia;

    Univ Estadual Campinas, Inst Fis Gleb Wataghin, POB 6165, BR-13083859 Sao Paulo, Brazil;

    Univ Estadual Campinas UNICAMP, Inst Quim, Caixa Postal 6154, BR-13083970 Campinas, SP, Brazil;

    Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;

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