Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Cesium lead halide perovskite (CsPbX3, X=Cl, Br, I) is a new material that has been reported in recent years and has attracted a lot of research focus. Its tunable band gap and better thermal stability than organic lead halide perovskite give it the potential for applications in optoelectronic devices such as light-emitting diodes and solar cells. CsPb(Br0.5I0.5)3 perovskite quantum dots (QDs) has been synthesized via solution process, and then three different anti-solvents was selected to purify the product. A significant effect on optical properties was found after the centrifugation process. A ~40 nm shift was found in both absorbance and photoluminescence (PL) spectra while no obvious change in pure CsPbBr3. Transmission electron microscope (TEM) and x-ray diffraction (XRD) was used to analyze the change of crystal, crystal remained silimar after purification. By using x-ray photoelectro spectroscopy (XPS), a Br:I ratio change was found which induced these spectra shift. Also, the ratio variation indicated that iodine can be removed easier than bromine. Electron and hole recombination rate was changed and all samples had a good PL quantum yield (PLQY) which was higher than 44%.
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