Although it is demanded for general lighting sources to have high color rendition qualities close to natural daylight, it is difficult to make sunlike artificial illuminants due to limited tunability of phosphors and complicated fabrication processes. On the contrary, white‐emitting quantum dot (QD) light‐emitting diodes (QLEDs) can be easily produced by mixing several colors of QDs in a single emitting layer (EML). In this work, sunlike white QLEDs showing high color rendition qualities are demonstrated by incorporating five (red, yellow, green, cyan, and blue) or six (additional violet) primary colors of QDs in the EML. Based on the simulation and optimization of the multichromatic spectra, the pentachromatic and hexachromatic white QLEDs exhibit the superb color rendering index of 96–98, the color quality scales of 95–97, and the spectral similarity index of up to 86, with tunable correlated color temperatures from daylight to overcast sky. The Förster resonant energy transfers between six colors of QDs are also investigated with time‐resolved photoluminescence spectroscopy. The analysis of the pentachromatic and hexachromatic white QLEDs with the sunlike spectra suggests that white QLEDs can be a promising candidate for next‐generation solid‐state lighting devices.

中文翻译：

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具有高彩色再现质量的日光白色量子点发光二极管

尽管要求普通光源具有接近自然日光的高色彩再现质量，但是由于磷光体的可调性有限和复杂的制造工艺而难以制造类似于太阳的人造光源。相反，通过在单个发光层（EML）中混合几种颜色的QD，可以轻松生产白色发光的量子点（QD）发光二极管（QLED）。在这项工作中，通过将五种（红色，黄色，绿色，青色和蓝色）或六种（另外的紫色）QD原色纳入EML中，展示了具有高色彩再现质量的太阳色白色QLED。基于多色光谱的仿真和优化，五色和六色白色QLED的显色指数为96-98，色标为95-97，光谱相似性指数高达86，并且具有从日光到阴天可调的相关色温。还使用时间分辨光致发光光谱研究了六种量子点之间的Förster共振能量转移。通过五色和六色白色QLED的日照光谱分析表明，白色QLED可以成为下一代固态照明设备的有希望的候选者。