Next generation displays based on quantum dot light-emitting diodes (QLEDs) require robust patterning methods for quantum dot layers. However, existing patterning methods mostly yield QLEDs with performance far inferior to the state-of-the-art individual devices. Here, we report a light-triggered, carbocation-enabled ligand stripping (CELS) approach to pattern QLEDs with high efficiency and stability. During CELS, photogenerated carbocations from triphenylmethyl chlorides remove native ligands of quantum dots, thereby producing patterns at microscale precision. Chloride anions passivate surface defects and endow patterned quantum dots with preserved photoluminescent quantum yields. It works for both cadmium-based and heavy-metal-free quantum dots. CELS-patterned QLEDs show remarkable external quantum efficiencies (19.1%, 17.5%, 12.0% for red, green, blue, respectively) and a long operation lifetime (T₉₅ at 1000 nits up to 8700 h). Both are among the highest for patterned QLEDs and approach the records for nonpatterned devices, which makes CELS promising for building high-performance QLED displays and related integrated devices.

中文翻译：

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通过光触发、启用碳阳离子的配体剥离对高效稳定的量子点发光二极管进行直接光图案化

基于量子点发光二极管 (QLED) 的下一代显示器需要稳健的量子点层图案化方法。然而，现有的图案化方法大多产生性能远低于最先进的单个器件的 QLED。在这里，我们报告了一种光触发的、支持碳阳离子的配体剥离 (CELS) 方法，以高效和稳定地对 QLED 进行图案化。在 CELS 期间，来自三苯甲基氯的光生碳阳离子去除了量子点的天然配体，从而产生了微米级精度的图案。氯离子钝化表面缺陷并赋予图案化量子点以保持光致发光量子产率。它适用于基于镉和不含重金属的量子点。CELS 图案的 QLED 显示出显着的外部量子效率（红色为 19.1%、17.5%、12.0%，T ₉₅在 1000 尼特高达 8700 小时）。两者都属于图案化 QLED 的最高水平，并接近非图案化设备的记录，这使得 CELS 有望用于构建高性能 QLED 显示器和相关集成设备。