The use of sterically hindered N,N′-diisopropylbenzene-1,2-diamine (DIBA) for aminophosphine-based InP QDs synthesis in an oleylamine (OLAm) medium is evidenced as a powerful tool to finely control their size in a reproducible way. This diamine forms in situ a P(DIBA)(OLAm) species accounting for the observed size-tuning effect because the QDs crystallize as tetrahedra with an edge length (3.5 to 6.6 nm) depending on the DIBA concentration (0 to 7 eq./indium). This kinetically controlled size-tuning mechanism is proposed by combining ³¹P NMR and UV–vis spectroscopy. A proof-of-concept is established by coating the InP cores with ZnS shells. The luminescence of the as-synthesized InP/ZnS QDs is tunable over the 480–620 nm range, with photoluminescence internal quantum efficiencies of 45 to 60% suitable for applications as phosphors in LED lighting systems and LED displays.

中文翻译：

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通过简单的受阻二胺加成实现明亮和可调光发射的尺寸控制的磷化铟量子点

在油胺 (OLAm) 介质中使用空间位阻N , N '-二异丙基苯-1,2-二胺 (DIBA) 合成基于氨基膦的 InP QDs 被证明是一种强大的工具，可以以可重复的方式精细控制其尺寸。这种二胺原位形成 P(DIBA)(OLAm) 物种，解释了观察到的尺寸调整效应，因为 QD 结晶为四面体，边缘长度（3.5 至 6.6 nm）取决于 DIBA 浓度（0 至 7 eq./铟）。这种动力学控制的尺寸调节机制是通过结合³¹P NMR和UV-vis光谱。通过用 ZnS 壳涂覆 InP 核来建立概念验证。合成的 InP/ZnS QD 的发光在 480-620 nm 范围内可调，光致发光内部量子效率为 45% 到 60%，适合作为 LED 照明系统和 LED 显示器中的磷光体应用。