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首页> 外文期刊>Nanotechnology >Cation-inverting-injection: a novel method for synthesis of aqueous ZnSe quantum dots with bright excitionic emission and suppressed trap emission
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Cation-inverting-injection: a novel method for synthesis of aqueous ZnSe quantum dots with bright excitionic emission and suppressed trap emission

机译：阳离子倒注：一种新颖的合成具有明亮激发发射和抑制陷阱发射的ZnSe水溶液量子点的方法

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摘要

In the conventional synthesis of aqueous ZnSe quantum dots (QDs), highly reactive Se monomers are rapidly injected into a Zn-thiol complexes solution at room temperature, resulting in a poor excitionic luminescence and a serious trap emission of as-prepared ZnSe QDs. In this paper, we develop a novel cation-inverting-injection method to prepare aqueous ZnSe QDs with a bright excitionic luminescence. In this method, highly reactive Se monomers are first diluted in the reaction solution, followed by low-reaction Zn-thiol complexes slowly dropped at a high reaction temperature (90 °C). The inverting monomer injection order, the suppressed monomer reactivity and the high nucleation temperature in the cation-inverting-injection method can contribute to low-concentration but high-quality ZnSe nuclei, thereby promoting the formation of ZnSe QDs with large-sized particles, a high excitionic emission and a weak trap emission. Asprepared ZnSe QDs exhibit an intense deep-blue excitionic emission, which is the first reported case of a visible excitionic emission instead of a trap emission resulting from ZnSe QDs that are directly synthesized in an aqueous media. Using three types of dyes, via two measuring methods, the accurate photoluminescence quantum yield of the as-prepared ZnSe QDs is measured as 15%, which is a new record for mercaptocarboxylic acid stabilized ZnSe QDs synthesized in an aqueous media.
机译：在常规的ZnSe量子点水溶液（QDs）合成中，高反应性的Se单体在室温下迅速注入Zn-硫醇配合物溶液中，导致兴奋性差的发光，并且制备的ZnSe QD的陷阱发射严重。在本文中，我们开发了一种新颖的阳离子反相注入方法，以制备具有明亮的激发发光的ZnSe量子点水溶液。在这种方法中，首先将高反应性的Se单体稀释在反应溶液中，然后在高反应温度（90°C）下缓慢滴入低反应性Zn-硫醇配合物。阳离子反相注入法中的反相单体注入顺序，抑制的单体反应性和较高的成核温度可有助于低浓度但高质量的ZnSe核，从而促进形成大尺寸颗粒的ZnSe QD。高激发发射和弱陷阱发射。制备的ZnSe QD表现出强烈的深蓝色激发发射，这是第一个报道的可见激发发射，而不是由在水介质中直接合成的ZnSe QD导致的陷阱发射。使用三种类型的染料，通过两种测量方法，所制备的ZnSe QD的准确光致发光量子产率为15％，这是在水介质中合成巯基羧酸稳定的ZnSe QD的新记录。

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