| 论文题目 | Epitaxial Growth of CsPbX3 (X = Cl, Br, I) Perovskite Quantum Dots via Surface Chemical Conversion of Cs2GeF6 Double Perovskites: A Novel Strategy for the Formation of Leadless Hybrid Perovskite Phosphors with Enhanced Stability |
| 作 者 | ; Yi Wei, K. Li, M. M. Liu, H. Xiao, P. P. Dang, S. S. Liang, Z. J. Wu,Yuping Wu, Jun Ming, Xiangming He, Junli Zhang |
| 发表年度 | APR 19 2019 |
| 刊物名称 | ADVANCED MATERIALS |
| 卷、期、页码 | 31; 16; |
| 影响因子 | |
| 论文摘要 | 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 Cs2GeF6 double perovskites with PbX2 (X = Cl, Br, I) is reported. The experimental results show that the surface of the Cs2GeF6 double perovskites is partially converted into CsPbX3 perovskite QDs and forms a CsPbX3/Cs2GeF6 hybrid structure. The theoretical calculations reveal that the CsPbBr3 conversion proceeds at the Cs2GeF6 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 Cs2GeF6:Mn4+ to green emissive CsPbBr3, the CsPbBr3/Cs2GeF6:Mn4+ hybrid can be employed as a low-lead hybrid perovskite phosphor on blue LED chips to produce white light. The leadless CsPbX3/Cs2GeF6 hybrid structure with stable photoluminescence opens new paths for the rational design of efficient emission phosphors and may stimulate the design of other functional CsPbX3/Cs-containing hybrid structures. |
| 全文链接 | https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201807592 |
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