研究目的
Investigating the evolution of morphology, phase composition, and photoluminescence of cesium lead bromine nanocrystals with temperature and precursors.
研究成果
The phase evolution and morphology of Cs4PbBr6, CsPbBr3, and CsPb2Br5 NCs were systematically studied. By regulating temperature, time, and Pb/Cs ratios, different phases were created without additional ligands. CsPbBr3 NCs revealed high PL, while no PL was observed for Cs4PbBr6 and CsPb2Br5 phases. The results promote the well growth controlling of these NCs and explore the phase evolution processes.
研究不足
The study focuses on the phase evolution and properties of Cs4PbBr6, CsPbBr3, and CsPb2Br5 NCs under specific conditions. The influence of other ligands or environmental factors was not explored.
1：Experimental Design and Method Selection:
CsPbBr3, CsPb2Br5, and Cs4PbBr6 NCs were prepared by a hot-injection method using oleylamine (OAm) and oleic acid (OA) without adding other ligands. The phase evolution was systematically tested by changing time, temperature, and the molar ratios of Pb/Cs.
2：Sample Selection and Data Sources:
Samples were synthesized with different molar ratios of Pb/Cs, reaction temperatures, and times.
3：List of Experimental Equipment and Materials:
Lead bromide (PbBr2, 99%), oleylamine (OAm, 90%), cesium carbonate (Cs2CO3,
4：9%), octadecene (ODE, technical grade of 90%), oleic acid (OA), hexane, and ethanol. Experimental Procedures and Operational Workflow:
The synthesis involved preparing cesium oleate precursor solutions, loading ODE and PbBr2 in a flask, injecting OAm and OA, raising the temperature, and injecting Cs-OA solution. The reaction was terminated at specific times, and the resulting solution was cooled and centrifuged.
5：Data Analysis Methods:
The absorption spectra, PL measurements, XRD, TEM, HRTEM, SEM, EDS, XPS, and AFM were used for characterization.
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