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.
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