Colloidal quantum dots are promising emitters for quantum-dot-based light-emitting-diodes. Though quantum dots have been synthesized with efficient, stable, and high colour-purity photoluminescence, inheriting their superior luminescent properties in light-emitting-diodes remains challenging. This is commonly attributed to unbalanced charge injection and/or interfacial exciton quenching in the devices. Here, a general but previously overlooked degradation channel in light-emitting-diodes, i.e., operando electrochemical reactions of surface ligands with injected charge carriers, is identified. We develop a strategy of applying electrochemically-inert ligands to quantum dots with excellent luminescent properties to bridge their photoluminescence-electroluminescence gap. This material-design principle is general for boosting electroluminescence efficiency and lifetime of the light-emitting-diodes, resulting in record-long operational lifetimes for both red-emitting light-emitting-diodes (T95 > 3800 h at 1000 cd m-2) and blue-emitting light-emitting-diodes (T50 > 10,000 h at 100 cd m-2). Our study provides a critical guideline for the quantum dots to be used in optoelectronic and electronic devices.

中文翻译：

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电化学稳定的配体弥合了量子点的光致发光-电致发光间隙。

胶体量子点是基于量子点的发光二极管的有希望的发射器。尽管已经合成了具有高效，稳定和高色纯度的光致发光的量子点，但是在发光二极管中继承其优异的发光特性仍然具有挑战性。这通常归因于装置中的不平衡电荷注入和/或界面激子猝灭。在此，确定了发光二极管中一般但先前被忽略的降解通道，即表面配体与注入的电荷载体的操作电化学反应。我们开发了一种将电化学惰性配体应用于具有出色发光性能的量子点的策略，以弥合它们的光致发光-电致发光间隙。这种材料设计原则通常用于提高电致发光效率和发光二极管的寿命，从而使两个红色发光二极管的工作寿命都达到创纪录的寿命（在1000 cd m-2时T95> 3800 h）和发蓝光的发光二极管（在100 cd m-2时T50> 10,000 h）。我们的研究为光电子和电子设备中使用的量子点提供了关键指导。