Complementary Triple-Ligand Engineering Approach to Methylamine Lead Bromide Nanocrystals for High-Performance Light-Emitting Diodes,ACS Applied Materials & Interfaces

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Complementary Triple-Ligand Engineering Approach to Methylamine Lead Bromide Nanocrystals for High-Performance Light-Emitting Diodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-02-18 , DOI: 10.1021/acsami.1c18791
Chenjing Zhao ₁ , Jinfei Dai ₁ , Chunrong Zhu ₁ , Xiaoyun Liu ₁ , Hua Dong _{1,

2} , Fang Yuan ₁ , Bo Jiao ₁ , Yue Yu ₁ , Zhaoxin Wu _{1,

2}

Affiliation

Conjugated and short-molecule capping ligands have been demonstrated as a valid strategy for achieving high-efficiency perovskite nanocrystal (NCs) light-emitting diodes (LEDs) owing to their advantage of allowing efficient carrier transport between NCs. However, monotonously utilizing conjugated ligands cannot achieve sufficient surface modification/passivation for perovskite NCs, leading to their poor photoluminescence quantum yield (PLQY) and dispersibility. This work designs a complementary ligand synthesis method to obtain high-quality methylamine lead bromide (MAPbBr₃) NCs and then leverage them into efficient LEDs. The complementary ligand system combines a conjugated ligand 3-phenyl-2-propen-1-amine (PPA) and a long-chain ligand didodecyldimethylammonium bromide (DDAB) together with a well-known inductive inorganic ligand ZnBr₂. With such complementary ligand engineering, we significantly improve the emissive features of MAPbBr₃ NCs (PLQY: 99% ± 0.7%). Simultaneously, the complementary ligand strategy facilitated the adequate charge transportation in related NCs films and modified the interfacial energy-level alignment when the NCs assemble as an emitting layer into LEDs. Finally, based on this NCs synthesis method, high-efficiency green LEDs were achieved, exhibiting the maximum luminance of 1.59 × 10⁴ cd m^–2, a current efficiency of 23.7 cd A^–1, and an external quantum efficiency of 7.8%. Our finding could provide a new avenue for further development of LEDs and their commercial application.

中文翻译：

用于高性能发光二极管的甲胺溴化铅纳米晶体的互补三配体工程方法

共轭和短分子封端配体已被证明是实现高效钙钛矿纳米晶体 (NCs) 发光二极管 (LED) 的有效策略，因为它们具有允许在 NCs 之间进行有效载流子传输的优势。然而，单调地利用共轭配体无法实现钙钛矿NCs的充分表面改性/钝化，导致其光致发光量子产率（PLQY）和分散性差。本工作设计了一种互补配体合成方法获得高质量的甲胺溴化铅（MAPbBr ₃) NC，然后将它们用于高效 LED。互补配体系统结合了共轭配体 3-苯基-2-丙烯-1-胺 (PPA) 和长链配体二十二烷基二甲基溴化铵 (DDAB) 以及众所周知的感应无机配体 ZnBr ₂。通过这种互补配体工程，我们显着改善了 MAPbBr ₃ NCs 的发射特性（PLQY：99% ± 0.7%）。同时，互补配体策略促进了相关 NCs 薄膜中的充分电荷传输，并在 NCs 作为发光层组装成 LED 时改变了界面能级排列。最后，基于这种NCs合成方法，实现了高效绿色LED，最大亮度为1.59×10 ⁴ cd m^–2，电流效率为 23.7 cd A ^–1，外量子效率为 7.8%。我们的发现可以为 LED 的进一步发展及其商业应用提供新的途径。

更新日期：2022-02-18

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