文献类型：期刊文献

英文题名：A high quality and quantity hybrid perovskite quantum dots (CsPbX3, X= Cl, Br and I) powders synthesis via ionic displacement

作者：Yin, Yuhang[1]; Luan, Weiling[1]; Zhang, Chengxi[1]; Yang, Fuqian[2]

机构：[1] Key Laboratory of Pressure Systems and Safety [MOE], School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Materials Program, Department of Chemical and Materials Engineering, University of Kentucky USA, Lexington, KY, 40513, United States

年份：2017

卷号：100

期号：1

外文期刊名：IOP Conference Series: Earth and Environmental Science

收录：EI(收录号：20175304593252)

语种：英文

外文关键词：Semiconductor quantum dots - Energy gap - Bromine compounds - Nanocrystals - Powders - Bromine - Chlorine compounds - Lead compounds

摘要：Recently, all-inorganic perovskites CsPbX3 (X= Cl, Br and I) quantum dots (QDs) have drawn great attentions because of their PL spectra tunable over the whole visible spectral region (400-700 nm) and adjustable bandgap, which revealed a promising potential on the field of photoelectronic devices, such as solar cells, LEDs and sensors. In this paper, CsPbX3 QDs and hybrid QDs, CsPbClxBr3-x and CsPbBrxI3-x were synthesized via one-step and two-step methods comparably. The optical bandgaps of CsPbCl3, CsPbBr3, and CsPbI3, were calculated as 3.08, 2.36, and 1.73eV, respectively, based on the Tauc's equation and UV absorption spectra. Ionic displacement and phase transformation occurred during the mixing process were found based on the monitoring of PL spectra and HRTEM characterization. The long-Term stability, dried, high quality and two-dimensional hybrid CsPbBrxI3-x QDs powders could be achieved via the two-step method. Polar solution inductions were used to wash and purify the CsPbX3 QDs, which help obtain of various compositions and well crystallize all-inorganic perovskites QDs powders. ? Published under licence by IOP Publishing Ltd.