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-xCl_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 MAPbBr₃ 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.

将氯化物和溴化物阴离子的卤化物混合物与短链配体苯乙胺 (PEA) 的交换相结合的简便方法用于制备杂化钙钛矿 PEA-MAPbBr _3-x Cl _x量子点 (PEA-QDs-Cl)，实现了蓝色发光量子点发光二极管 (QLED) 具有比国家电视系统委员会 (NTSC) 电视色彩标准更广的国际照明委员会 (CIE) 坐标色域 (Δx = -0.04, Δy = 0.03)。与原始 MAPbBr ₃相比由常规长链配体制备的量子点（原始量子点），PEA-QDs-Cl 的尺寸从 9 nm 控制到 3 nm，通过 HRTEM 表征，发射光谱从 528 nm 蓝移到 469 nm，通过光致发光测量（ PL）。同时，掺杂氯阴离子（QDs-Cl）的钙钛矿量子点的时间分辨PL（TRPL）衰减寿命从10.3 ns提高到13.9 ns，这是因为引入了短链配体来钝化QDs-Cl表面的缺陷. 此外，XPS 结果表明，通过 PEA 钝化 QDs-Cl 表面的氯化物空位，氯化物含量从 34.7% 降低到 33.7%。