The external quantum efficiencies of state-of-the-art colloidal quantum dot light-emitting diodes (QLEDs) are now approaching the limit set by the out-coupling efficiency. However, the brightness of these devices is constrained by the use of poorly conducting emitting layers, a consequence of the present-day reliance on long-chain organic capping ligands. Here, we report how conductive and passivating halides can be implemented in Zn chalcogenide-shelled colloidal quantum dots to enable high-brightness green QLEDs. We use a surface management reagent, thionyl chloride (SOCl₂), to chlorinate the carboxylic group of oleic acid and graft the surfaces of the colloidal quantum dots with passivating chloride anions. This results in devices with an improved mobility that retain high external quantum efficiencies in the high-injection-current region and also feature a reduced turn-on voltage of 2.5 V. The treated QLEDs operate with a brightness of 460,000 cd m⁻², significantly exceeding that of all previously reported solution-processed LEDs.

目前最先进的胶体量子点发光二极管（QLED）的外部量子效率已接近由外耦合效率设定的极限。然而，这些器件的亮度由于使用导电性差的发射层而受到限制，这是当今依赖于长链有机封端配体的结果。在这里，我们报告了如何在含锌硫族化物的胶体量子点中实现导电和钝化卤化物，以实现高亮度绿色QLED。我们使用表面处理剂亚硫酰氯（SOCl ₂），以氯化油酸的羧基，并用钝化氯离子接枝胶体量子点的表面。这导致具有提高的迁移率的器件，该器件在高注入电流区域中保留了较高的外部量子效率，并且具有降低的2.5 V开启电压的特性。经过处理的QLED的亮度为460,000 cd m ^-2，显着超过了以前报告的所有溶液处理的LED。