Heterogeneous Nucleation toward Polar‐Solvent‐Free, Fast, and One‐Pot Synthesis of Highly Uniform Perovskite Quantum Dots for Wider Color Gamut Display,Advanced Materials Interfaces

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Heterogeneous Nucleation toward Polar‐Solvent‐Free, Fast, and One‐Pot Synthesis of Highly Uniform Perovskite Quantum Dots for Wider Color Gamut Display
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-02-13 , DOI: 10.1002/admi.201800010
Xiaoming Li ₁ , Kan Zhang ₁ , Jianhai Li ₁ , Jun Chen ₁ , Ye Wu ₁ , Kai Liu ₁ , Jizhong Song ₁ , Haibo Zeng ₁

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Inorganic halide perovskite quantum dots (IPQDs) hold great potentials for wide color gamut displays due to their high quantum yield, narrow, and composition‐tunable emissions. However, they are facing a big challenge to narrower size distribution and upscalable synthesis procedure. Here, different from the usual spontaneous nucleation, a one‐pot strategy, simply aided by uniformly heterogeneous nucleation agents, achieving mass production (≈1.8 g) with high product yield within short reaction time for various IPQDs is demonstrated. This method not only avoids the use of polar solvents, but also averts desirable transfer or injection operations. The heterogeneous nucleation takes place at surface chemical inert materials, which provide additional spatial separation effect, inhibiting the aggregative regrowth of primary IPQDs and thus enabling homogeneous nucleation and growth for various IPQDs. As a result, highly uniform IPQDs, as well as higher color purity, are achieved. Impressively, CsPbBr₃ QD dispersion exhibits ultranarrow full width at half maximum of 15.5 nm. Overall, through the novel strategy, blue, green, and red light‐emitting diodes (LEDs) achieved with good optical properties contribute to a color gamut of 140% of the National Television System Committee standard, which is among the widest color gamut in the field of QLED and hence significant for the future high‐definition display.

中文翻译：

异质成核，实现无极性，快速，单锅合成高度均匀的钙钛矿量子点，从而实现更宽的色域显示

无机卤化物钙钛矿量子点（IPQD）由于其高量子产率，窄且可调节组成的发射而具有广阔的色域显示潜力。然而，它们面临着更窄的尺寸分布和可升级的合成程序的巨大挑战。在此，与通常的自发成核不同，展示了一种单锅策略，该方法简单地由均匀异质成核剂辅助，可以在短时间内针对各种IPQD实现大量生产（≈1.8g）且具有高产物收率。该方法不仅避免使用极性溶剂，而且避免了所需的转移或注射操作。异质成核发生在表面化学惰性材料上，这提供了额外的空间分离效果，抑制主要IPQD的总体再生长，从而实现各种IPQD的均匀成核和生长。结果，获得了高度均匀的IPQD，以及更高的色纯度。令人印象深刻的是CsPbBr₃ QD分散体在15.5 nm的一半最大值处显示超窄全宽。总体而言，通过这种新颖的策略，具有良好光学性能的蓝色，绿色和红色发光二极管（LED）的色域达到了美国国家电视系统委员会标准的140％，是美国电视系统委员会标准中最宽的色域之一。 QLED的领域，因此对未来的高清显示器具有重要意义。

更新日期：2018-02-13

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