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Self‐Assembly of Completely Inorganic Perovskite Nanocrystals with Improved Stability by Anchoring on Kaolinite Lamellae
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-01-14 , DOI: 10.1002/adom.201901485
Wenzhen Lv 1 , Ling Li 1 , Mingguang Li 1 , Ligang Xu 1 , Wei Huang 2 , Runfeng Chen 1
Affiliation  

Completely inorganic lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs) are attracting increasing attention due to their outstanding luminescent properties, but their inherently poor stability is a severe impediment to further practical applications. Here, a facile two‐step synthetic procedure for preparing highly stable CsPbX3 NCs with the assistance of kaolinite lamellae (KL) is demonstrated. Systematic investigation shows that the cesium ions can be anchored tightly to the KL with the aid of strong Coulombic force interactions. These trigger the efficient growth of orthorhombic phase CsPbX3 NCs on the KL surfaces in a highly ordered manner. As a benefit of the inhibited aggregation caused by isolation and the anchoring effect of KL, the CsPbBr3‐KL composites display high luminescent efficiency (up to 73.0%) and excellent stability in air (>240 h). An efficient, stable, white light‐emitting diode device is fabricated by packaging green CsPbBr3‐KL and red CsPb(Br0.5I0.5)3‐KL composites on a blue GaN chip. These findings demonstrate the first attempt to improve the stability of CsPbX3 NCs by designing composites with materials having natural layers. This should shed important light on the preparation of high‐efficiency, stable, and color‐tunable perovskite materials for applications requiring high‐performance devices.

中文翻译:

通过锚固在高岭石薄片上的具有完全稳定性的完全无机钙钛矿纳米晶体的自组装

完全无机的卤化钙钛矿(CsPbX 3,X = Cl,Br,I)纳米晶体(NCs)由于其出色的发光性能而受到越来越多的关注,但是它们固有的稳定性差严重阻碍了进一步的实际应用。在此,展示了一种简单的两步合成程序,该程序可借助高岭石薄片(KL)制备高度稳定的CsPbX 3 NC。系统研究表明,铯离子可以通过强大的库仑力相互作用牢固地固定在KL上。这些触发了正交相CsPbX 3的有效生长KL表面上的NC高度有序。由于KL的分离和KL的锚定作用而抑制了聚集,CsPbBr 3 -KL复合材料显示出高发光效率(高达73.0%)和出色的空气稳定性(> 240小时)。通过将绿色CsPbBr 3 -KL和红色CsPb(Br 0.5 I 0.53 -KL复合材料包装在蓝色GaN芯片上,可以制造出高效,稳定的白色发光二极管器件。这些发现证明了提高CsPbX 3稳定性的首次尝试。通过设计具有天然层材料的复合材料来进行NC。这应该为需要高性能设备的应用制备高效,稳定和颜色可调的钙钛矿材料提供重要参考。
更新日期:2020-03-20
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