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The facile approach combined the halide mixture of chloride and bromide anions with the exchange of short-chain ligand Phenethylamine (PEA) was used to prepare hybrid perovskite PEA-MAPbBr 3-x Cl x quantum dots (PEA-QDs-Cl), which realized blue emissive quantum dots light-emitting diode (QLED) with wider gamut of Commission Internationale de l'Eclairage (CIE) coordinates (Δx = −0.04, Δy = 0.03) than National Television Systems Committee (NTSC) TV color standard. Compared to pristine MAPbBr 3 quantum dots (pristine-QDs) prepared by conventional long-chain ligands, the size of PEA-QDs-Cl was manipulated from 9 nm to 3 nm characterized by HRTEM, emissive spectra were blue shifted from 528 nm to 469 nm measured by photoluminescence (PL). Meanwhile, time-resolved PL (TRPL) decay lifetimes of perovskite quantum dots doped with chloride anions (QDs-Cl) were improved from 10.3 ns to 13.9 ns, because short-chain ligands were introduced to passivate defects on the surface of QDs-Cl. Furthermore, XPS results showed that the chloride content was decreased from 34.7% to 33.7% through chloride vacancies on the surface of QDs-Cl were passivated by PEA. [Display omitted] • Perovskite quantum dots prepared by halide mixture of chloride and bromide anions. • Introducing short-chain ligands to passivate the defects on the surface of QDs-Cl. • Sizes of QDs-Cl were manipulated from 9 nm to 3 nm by anion exchange method. • PL shows color tunable emissive spectra were blue shifted from 528 nm to 469 nm. • Blue emissive perovskite QLEDs with wider gamut of CIE coordinates than NTSC. [ABSTRACT FROM AUTHOR]