Quantum dot light‐emitting diodes (QLEDs) are considered to be the candidate light sources with the most potential for applications in displays. Recent advances in luminance, external quantum efficiency (EQE), and even the operation lifetime of QLEDs have already satisfied the requirements for low‐light‐level displays. However, the short operation lifetime under high brightness limits the application of QLEDs for outdoor displays and lightings. Here, demonstrated are green QLEDs with a T₉₅ operation lifetime reaching up to 2500 h at high brightness (1000 cd m⁻²) with a high peak EQE of 23.9%, current efficiency of 100.5 cd A⁻¹, and low efficiency roll‐off at high current. Both the EQE and lifetime of the QLEDs are superior to those reported to date for all solution‐processed green QLEDs. These major advances are qualitatively attributed to the use of a shell‐tailoring strategy for producing compositional graded CdZnSe/ZnSe/ZnSeS/ZnS quantum dots with a high photoluminescence quantum yield, suppressed nonradiative Förster resonant energy transfer and Auger recombination, and favorable valence band alignment for enhanced hole injection. Collectively, this work represents a huge step forward in eventually realizing QLEDs for high‐brightness display and lighting applications.

中文翻译：

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用于室外显示器的量子点发光二极管，在高亮度下具有高稳定性

量子点发光二极管（QLED）被认为是最有可能用于显示器的候选光源。亮度，外部量子效率（EQE）甚至是QLED的工作寿命方面的最新进展已经满足了对微光显示器的要求。但是，高亮度下的短使用寿命会限制QLED在户外显示器和照明设备中的应用。此处展示的是绿色QLED，在高亮度（1000 cd m ^-2）和最高EQE为23.9％，电流效率为100.5 cd A ^{-1的情况下}，T _95的工作寿命可达2500 h。，以及大电流下的低效率滚降。QLED的EQE和寿命均优于迄今报道的所有溶液处理的绿色QLED。这些重大进展在质量上归因于使用壳裁制策略来生产具有高光致发光量子产率，抑制了非辐射Förster共振能量转移和俄歇重组以及价带取向良好的成分渐变CdZnSe / ZnSe / ZnSeS / ZnS量子点用于增强空穴注入。总体而言，这项工作代表了在最终实现用于高亮度显示和照明应用的QLED方面的巨大进步。