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http://dx.doi.org/10.5695/JKISE.2018.51.5.257

Anion Exchange Reaction Dynamics in Cesium Lead Halide Perovskite Quantum Dots  

Lee, See Maek (Korea Institute of Ceramic Engineering and Technology, Electronic Conversion Materials Division)
Jung, Hyunsung (Korea Institute of Ceramic Engineering and Technology, Electronic Conversion Materials Division)
Park, Woonik (Korea Institute of Ceramic Engineering and Technology, Electronic Conversion Materials Division)
Lim, Hyunseob (Department of Chemistry, Chonnam National University (CNU))
Bang, Jiwon (Korea Institute of Ceramic Engineering and Technology, Electronic Conversion Materials Division)
Publication Information
Journal of the Korean institute of surface engineering / v.51, no.5, 2018 , pp. 257-262 More about this Journal
Abstract
Cesium lead halide perovskite quantum dots (QDs) have recently emerged as highly promising opto-electronic materials. Despite the relative facile anion exchange reactions in cesium lead halide perovskite QDs, in depth study of the anion exchange reactions such as reaction kinetics are required that can provide insight into the crystal transformation in the cesium lead halide perovskite QDs. Herein, we investigated the anion exchange reaction from $CsPbI_3$ QDs to $CsPbBr_3$ QDs with varying the particle size of the starting $CsPbI_3$ QDs. By characterizing the PL spectra in the anion exchange reaction process, we observed that discontinuous PL peak shifts during I-to-Br anion exchange reaction in starting $CsPbI_3$ QDs over a critical size. Origin of the discontinuous I-to-Br anion exchange kinetics are mainly due to thermodynamically unstable nature of the $CsPb(Br/I)_3$ alloy QDs.
Keywords
Cesium lead halide; Quantum dots; Anion exchange; Surface;
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