| Abstrakt: |
In this work, a facile solution based on the supersaturated crystallization principle combined with an ion exchange strategy was employed for the preparation of all-inorganic lead halide perovskite CsPbX3 quantum dots (X = Cl, Br, I, and their combinations) under an ambient atmosphere. As the results showed, with the progression of Br–Cl and Br–I ion exchange, the green emission of pure CsPbBr3 gradually turned to cyan and blue, yellow, and red, respectively. Thus, the emission featured a broad wavelength range from 472 nm to 638 nm. With regard to the morphology, the as-synthesized quantum dots were all spherical and monodisperse, and the crystal size increased from the blue to the red samples. Furthermore, the chemical composition investigated by energy-dispersive x-ray spectroscopy (EDS) and x-ray photoelectron spectroscopy (XPS) confirmed the successful Br–Cl or Br–I ion exchange, and the obtained samples were expressed as CsPbBr1.9Cl1.1, CsPbBr2.1Cl0.9, CsPbBr3, CsPbBr1.7I1.3, and CsPbBr0.9I2.1 for blue, cyan, green, yellow, and red samples, respectively. In future work, the as-synthesized samples will be investigated for use in an optoelectronic device application. [ABSTRACT FROM AUTHOR] |
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