Quantum dots (QDs) are promising for being used in advanced displays due to their outstanding emission properties. Herein, a novel encapsulation method for QDs is reported and ultra‐stable QDs@SiO₂@Al₂O₃ luminescent microspheres (QLuMiS) are obtained by combining a sol–gel method for the intermediate SiO₂ layer with a fluidized powder atomic layer deposition (ALD) for the outer Al₂O₃ layer. The rich hydroxyl coverage on the QDs@SiO₂ surface provides abundant chemisorption sites, which are beneficial for the deposition of Al₂O₃ in the ALD process. Simultaneously, the water‐oxygen channels in the SiO₂ layer are blocked by the Al₂O₃ layer, which protects the QDs against deterioration. Consequently, the QLuMiS exhibit an excellent stability with 86% of the initial light conversion efficiency after 1000 h of blue light aging under a light power density of 2000 mW cm⁻². Such stability is significantly better than that of QDs@Al₂O₃ and QDs@SiO₂ samples. Moreover, under this strong irradiation aging condition with blue light, the extrapolated lifetime (L50) of QLuMiS is 4969 h, which is ten times longer than that of QDs@SiO₂ and is the best record as far as is known. Finally, a prototype of a QLuMiS‐based cellphone screen with a wide color gamut of 115% NTSC is demonstrated.

中文翻译：

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面向显示应用的量子点发光微球的原子层沉积辅助封装

量子点（QD）由于其出色的发射特性而有望用于高级显示器。在此，报道了一种新型的量子点封装方法，并通过将溶胶-凝胶法与中间的SiO ₂层的溶胶-凝胶法与流化粉末原子层沉积相结合，获得了超稳定的QDs @ SiO ₂ @Al ₂ O ₃发光微球（QLuMiS）。Al ₂ O ₃的外层（ALD）。QDs @ SiO ₂表面上丰富的羟基覆盖范围提供了丰富的化学吸附位点，这有利于ALD工艺中Al ₂ O ₃的沉积。同时，SiO中的水氧通道₂层被Al ₂ O ₃层阻挡，从而保护了QD免受损坏。因此，在2000mW cm ^-2的光功率密度下，经过1000小时的蓝光老化后，QLuMiS显示出优异的稳定性，并且初始光转换效率为86％。这种稳定性明显优于QDs @ Al ₂ O ₃和QDs @ SiO ₂样品。此外，在这种强烈的蓝光辐射老化条件下，QLuMiS的外推寿命（L50）为4969 h，比QDs @ SiO _2的寿命长十倍。并且是已知的最好记录。最后，展示了基于QLuMiS的手机屏幕的原型，其色域为115％NTSC。