科研之友
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摘要
Ultrasound method is one of the most effective methods to prepare high-quanlity CsPbBr 3 nanocrystals in open air. The CsPbBr 3 nanocrystals were obtained by ultrasound effect after adding PbBr 2 and Cs 2 CO 3 into a mixture solution composing of 1-octadecene (ODE), oleic acid (OA) and oleylamine (OLA). The effect of temperature on the preparation of CsPbBr 3 nanoparticles by ultrasonic method was investigated by controlling the reaction temperature in a self-made react vessel. It was found that sighificant affect of reaction temperature in the process to prepare CsPbBr 3 nanocrystals was observed. In must be pointed out firstly that CsPbBr 3 nanocrystals were not be obtained by ultrasound method when the temperature was lower than 70℃. With increasing the temperature, the duration to prepare CsPbBr 3 nanocrystals was shortened, and the fluorescence intensity of CsPbBr 3 nanoparticles were enhanced. Finally, monodisperse cubic CsPbBr 3 nanocrystals with high quality were obtained at 80℃. The average size of the CsPbBr 3 nanocrystals was 20 nm. Under the excitation of ultraviolet light, the CsPbBr 3 nanocrystals emitted stong green fluorescence with wavelength of 518 nm and very narrow emission width of 16 nm, indicating excellent optical property. Besides, the effect of surface ligands (OA and OLA) on the morphology of CsPbBr 3 nanocrystals by ultrasound method were also investigated.
