Epitaxial Growth of CsPbX3 (X = Cl, Br, I) Perovskite Quantum Dots via Surface Chemical Conversion of Cs2 GeF6 Double Perovskites: A Novel Strategy for the Formation of Leadless Hybrid Perovskite Phosphors with Enhanced Stability

Advanced Materials
Yi WeiJun Lin

Abstract

Lead halide perovskites (LHPs) have received increased attention owing to their intriguing optoelectronic and photonic properties. However, the toxicity of lead and the lack of long-term stability are potential obstacles for the application of LHPs. Herein, the epitaxial synthesis of CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) by surface chemical conversion of Cs2 GeF6 double perovskites with PbX2 (X = Cl, Br, I) is reported. The experimental results show that the surface of the Cs2 GeF6 double perovskites is partially converted into CsPbX3 perovskite QDs and forms a CsPbX3 /Cs2 GeF6 hybrid structure. The theoretical calculations reveal that the CsPbBr3 conversion proceeds at the Cs2 GeF6 edge through sequential growth of multiple PbBr64- layers. Through the conversion strategy, luminescent and color-tunable CsPbX3 QDs can be obtained, and these products present high stability against decomposition due to anchoring effects. Moreover, by partially converting red emissive Cs2 GeF6 :Mn4+ to green emissive CsPbBr3 , the CsPbBr3 /Cs2 GeF6 :Mn4+ hybrid can be employed as a low-lead hybrid perovskite phosphor on blue LED chips to produce white light. The leadless CsPbX3 /Cs2 GeF6 hybrid structure with stable photoluminescence...Continue Reading

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Citations

Dec 22, 2020·Advanced Materials·Hsin-Ping WangJr-Hau He
Nov 19, 2020·Chemical Communications : Chem Comm·Xingwen ChengXueyuan Chen
Jan 13, 2021·Nature Communications·Longfei Ruan, Yong Zhang
Jul 31, 2021·Optics Letters·Yongmin DuanJunjie Zhang

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