All-inorganic perovskite cesium lead halide quantum dots (QDs) have been widely investigated as promising materials for optoelectronic application because of their outstanding photoluminescence (PL) properties and benefits from quantum effects. Although QDs with full-spectra visible emission have been synthesized for years, the PL quantum yield (PLQY) of pure blue-emitting QDs still stays at a low level, in contrast to their green- or red-emitting counterparts. Herein, we obtained core–shell structured cubic CsPbBr₃@amorphous CsPbBr_x (A-CsPbBr_x) perovskite QDs via a facile hot injection method and centrifugation process. The core–shell structure QDs showed a record blue emission PLQY of 84%, which is much higher than that of blue-emitting cubic CsPbBr₃ QDs and CsPbBr_xCl_3–x QDs. Furthermore, a blue-emitting QDs-assisted LED with bright pure blue emission was prepared and illustrated the core–shell QDs’ promising prospect in optoelectrical application.

中文翻译：

---

立方CsPbBr ₃ @无定形CsPbBr _x钙钛矿量子点的原始核-壳结构，具有超过80％的高蓝色光致发光量子产率

全无机钙钛矿铯卤化铅量子点（QDs）由于其出色的光致发光（PL）特性和受益于量子效应而被广泛研究为光电子应用的有前途的材料。尽管已经合成了具有全光谱可见光发射的QD多年，但与发出绿色或红色光的QD相比，发出纯蓝色的QD的PL量子产率（PLQY）仍然保持在较低水平。在这里，我们通过简便的热注射方法和离心过程获得了核-壳结构立方CsPbBr ₃ @无定形CsPbBr _x（A-CsPbBr _x）钙钛矿QD。核-壳结构量子点显示出创纪录的蓝色发射PLQY为84％，远高于发射蓝色的立方CsPbBr_3个QD和CsPbBr _x Cl _{3– x个}QD。此外，还准备了具有明亮的纯蓝色发射的蓝光QD辅助LED，并说明了核壳QD在光电应用中的有前途的前景。