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Green and High Yield Synthesis of CdTe@Hydrotalcite Nanocrystals with Enhanced Photoluminescence Stability toward White Light Emitting Diodes
Journal of Luminescence ( IF 3.6 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jlumin.2020.117625
Ge Li , Tong-Bo Chen , Zhixing Zhao , Luting Ling , Qing Li , Su Chen

Abstract As a new type of luminescent material, quantum dots (QDs) with adjustable photoluminescence and narrow emission have attracted extensive attention in various fields. However, the large-scale production of QDs powders with high stability remains a key challenge, which greatly limits their wide applications. In this work, we synthesized highly stable QDs powders via a facile and simple co-precipitation method by embedding CdTe QDs into inorganic Mg2Al(OH)7 hydrotalcite matrix. This method shows distinct advantages of rapid separation of QDs powder through simple filtration, leading to a high yield of QDs powders and effectively avoiding heavy metal ions waste water. Compared with the parental CdTe QDs, the as-prepared CdTe@Mg2Al(OH)7 composites exhibit enhanced photoluminescence stability, longer photoluminescence decay lifetime, and better thermostability due to the protection of the Mg2Al(OH)7 hydrotalcite matrix. Based on the above excellent properties, we utilized the CdTe@Mg2Al(OH)7 powders as a red light conversion layer to prepare white light emitting diodes, which show high color-rendering properties with Commission Internationale de L'Eclairage (CIE) color coordinate of (0.3639, 0.3531), high color rendering index (CRI) value of 88, and color temperature (Tc) of 5112 K at 20 mA. This work offers an environmental friendly, low-cost and large-scale production route for high-performance QDs powders.

中文翻译:

CdTe@水滑石纳米晶体的绿色和高产率合成对白光发光二极管具有增强的光致发光稳定性

摘要 作为一种新型发光材料,具有可调光致发光和窄发射的量子点(QDs)在各个领域受到广泛关注。然而,大规模生产具有高稳定性的量子点粉末仍然是一个关键挑战,这极大地限制了其广泛应用。在这项工作中,我们通过将 CdTe 量子点嵌入无机 Mg2Al(OH)7 水滑石基质中,通过简便的共沉淀方法合成了高度稳定的量子点粉末。该方法具有通过简单过滤快速分离量子点粉末的明显优势,导致量子点粉末收率高,有效避免重金属离子废水。与母体 CdTe QD 相比,所制备的 CdTe@Mg2Al(OH)7 复合材料表现出增强的光致发光稳定性,更长的光致发光衰减寿命,由于 Mg2Al(OH)7 水滑石基体的保护,因此具有更好的热稳定性。基于上述优异性能,我们利用 CdTe@Mg2Al(OH)7 粉末作为红光转换层制备白光发光二极管,其具有高显色性,符合国际照明委员会 (CIE) 色坐标(0.3639, 0.3531),高显色指数 (CRI) 值为 88,色温 (Tc) 在 20 mA 时为 5112 K。这项工作为高性能量子点粉末提供了一条环保、低成本、规模化的生产路线。其显示出高显色性,Commission Internationale de L'Eclairage (CIE) 色坐标为 (0.3639, 0.3531),高显色指数 (CRI) 值为 88,色温 (Tc) 在 20 mA 时为 5112 K。这项工作为高性能量子点粉末提供了一条环保、低成本、规模化的生产路线。显示出高显色性,Commission Internationale de L'Eclairage (CIE) 色坐标为 (0.3639, 0.3531),高显色指数 (CRI) 值为 88,色温 (Tc) 在 20 mA 时为 5112 K。这项工作为高性能量子点粉末提供了一条环保、低成本、规模化的生产路线。
更新日期:2020-12-01
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