酸蚀诱导过氧化物量子点的金属阳离子竞争性晶格占位,实现高效纯蓝 QLED

IF 24.5 Q1 CHEMISTRY, PHYSICAL
Hanwen Zhu, Guoqing Tong, Junchun Li, Xuyong Tao, Yang Shen, Yuanyuan Sheng, Lin Shi, Fengming Xie, Jianxin Tang, Yang Jiang
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引用次数: 0

摘要

由表面缺陷引起的低效率和光谱不稳定性一直是混合卤素蓝色发光的包晶量子点发光二极管(PeQLEDs)面临的重大问题。在这里,通过引入金属阳离子竞争性晶格占位并辅以酸蚀,实现了对包晶量子点(PeQDs)的原位表面钝化,其中通过添加辛酸(OTAC)去除长链、绝缘和弱键表面配体。同时,溶解的 A 位阳离子(Na+)与质子化的油胺竞争,随后被锚定到表面空位上。预添加的溴化铅作为无机配体,与未配位的表面离子结合力很强。合成的 PeQDs 显示出更高的光致发光量子产率(PLQY)和更长的稳定性。因此,基于 OTAC-Na PeQDs 的 PeQLED(470 nm)在混合卤素 PeQDs(CsPb(BrxCl1-x)3)中表现出 8.42% 的外部量子效率。此外,该器件还表现出卓越的光谱稳定性,其偏移可以忽略不计。我们的竞争机制与原位钝化策略相结合,为提高蓝色 PeQLED 的性能铺平了一条新路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Acid-etching induced metal cation competitive lattice occupancy of perovskite quantum dots for efficient pure-blue QLEDs

Acid-etching induced metal cation competitive lattice occupancy of perovskite quantum dots for efficient pure-blue QLEDs

Low efficiency and spectral instability caused by the surface defects have been considerable issues for the mixed-halogen blue emitting perovskite quantum dots light-emitting diodes (PeQLEDs). Here, an in situ surface passivation to perovskite quantum dots (PeQDs) is realized by introducing the metal cations competitive lattice occupancy assisted with acid-etching, in which the long-chain, insulating and weakly bond surface ligands are removed by addition of octanoic acid (OTAC). Meanwhile, the dissolved A-site cations (Na+) compete with the protonated oleyl amine and are subsequently anchored to the surface vacancies. The preadded lead bromide, acting as inorganic ligands, demonstrates strong bonding to the uncoordinated surface ions. The as-synthesized PeQDs show the boosted photoluminescence quantum yield (PLQY) and superior stability with longer lifetime. As a result, the PeQLEDs (470 nm) based on the OTAC-Na PeQDs exhibit an external quantum efficiency of 8.42% in the mixed halogen PeQDs (CsPb(BrxCl1−x)3). Moreover, the device exhibits superior spectra stability with negligible shift. Our competition mechanism in combination with in situ passivation strategy paves a new way for improving the performance of blue PeQLEDs.

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