Perovskite quantum dots have significant potential for light-emitting devices because of their high colour purity and colour tunability in the visible spectrum. Here, we report highly efficient red perovskite quantum dot-based light-emitting devices. The quantum dots were fabricated by anion exchange from pristine CsPbBr₃ using halide-anion-containing alkyl ammonium and aryl ammonium salts. Anion-exchange quantum dots based on ammonium iodine salts exhibited a strong redshift from green emission to a deep-red emission at 649 nm as well as higher photoluminescence quantum yields. Furthermore, the quantum dot-based light-emitting device with the alkyl ammonium iodine salt exhibited an external quantum efficiency of 21.3% and high colour purity, with Commission Internationale de l’Eclairage coordinates of (0.72, 0.28), while the light-emitting device with the aryl ammonium iodine salt showed an external quantum efficiency of 14.1%. Finally, the operational stability of the latter was 36 times higher because the surface ligand density of the corresponding quantum dots was lower.

钙钛矿量子点具有很高的色纯度和可见光谱中的颜色可调性，因此在发光器件中具有巨大的潜力。在这里，我们报道了高效的红色钙钛矿量子点基发光器件。量子点是通过原始CsPbBr _3的阴离子交换制备的。使用含卤化物阴离子的烷基铵盐和芳基铵盐。基于碘化铵盐的阴离子交换量子点在649 nm处显示出从绿色发射到深红色发射的强烈红移，以及更高的光致发光量子产率。此外，具有烷基碘碘盐的量子点基发光器件显示出21.3％的外部量子效率和高色纯度，同时具有国际照明委员会（Emission Internationale de l'Eclairage）坐标为（0.72，0.28）。具有芳基碘化铵盐的器件显示的外部量子效率为14.1％。最后，后者的操作稳定性提高了36倍，因为相应量子点的表面配体密度更低。