Quantum dots (QDs) with metal fluoride surface ligands were prepared via reaction with anhydrous oleylammonium fluoride. Carboxylate terminated II–VI QDs underwent carboxylate for fluoride exchange, while InP QDs underwent photochemical acidolysis yielding oleylamine, PH₃, and InF₃. The final photoluminescence quantum yield (PLQY) reached 83% for InP and near unity for core–shell QDs. Core-only CdS QDs showed dramatic improvements in PLQY, but only after exposure to air. Following etching, the InP QDs were bound by oleylamine ligands that were characterized by the frequency and breadth of the corresponding ν(N–H) bands in the infrared absorption spectrum. The fluoride content (1.6–9.2 nm^–2) was measured by titration with chlorotrimethylsilane and compared with the oleylamine content (2.3–5.1 nm^–2) supporting the formation of densely covered surfaces. The influence of metal fluoride adsorption on the air stability of QDs is discussed.

中文翻译：

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金属氟化物钝化 II-VI 和 III-V 量子点


通过与无水油基氟化铵反应制备了具有金属氟化物表面配体的量子点（QD）。羧酸盐封端的 II-VI 量子点经过羧酸盐进行氟化物交换，而 InP 量子点经过光化学酸解产生油胺、PH ₃ 和 InF ₃ 。 InP 的最终光致发光量子产率 (PLQY) 达到 83%，核壳量子点的最终光致发光量子产率接近一致。仅核心的 CdS 量子点在 PLQY 方面表现出显着的改善，但仅在暴露于空气后才出现。蚀刻后，InP QD 与油胺配体结合，油胺配体的特征在于红外吸收光谱中相应 ν(N-H) 带的频率和宽度。通过用三甲基氯硅烷滴定来测量氟化物含量（1.6–9.2 nm ^–2 ），并与支持形成致密覆盖表面的油胺含量（2.3–5.1 nm ^–2 ）进行比较。讨论了金属氟化物吸附对量子点空气稳定性的影响。