Anion Exchange Reaction Dynamics in Cesium Lead Halide Perovskite Quantum Dots

Cesium Lead Halide 페로브스카이트 양자점의 음이온 교환 반응 동역학

  • 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)
  • 이시맥 (한국세라믹기술원 전자융합소재본부 나노융합소재센터) ;
  • 정현성 (한국세라믹기술원 전자융합소재본부 나노융합소재센터) ;
  • 박운익 (한국세라믹기술원 전자융합소재본부 나노융합소재센터) ;
  • 임현섭 (전남대학교 화학과) ;
  • 방지원 (한국세라믹기술원 전자융합소재본부 나노융합소재센터)
  • Received : 2018.10.04
  • Accepted : 2018.10.25
  • Published : 2018.10.31


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.


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Fig. 1. Optical (a) absorption, and (b) photoluminescence of the CsPbI3 QDs dispersed in hexane.

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Fig. 3. PL spectra during a CsPbBr3 to CsPbI3 NC conversion for two different starting CsPbI3 QD samples. (a) 678 nm emitting, and (b) 692 nm emitting CsPbI3 QD samples.

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Fig. 2. (a) PL spectra during a CsPbI3 to CsPbBr3 QD conversion. (b) Powder XRD patterns of pristine CsPbI3 QDs (red) and anion exchanged CsPbBr3 QDs (green), in which the bars on the top and bottom represent the bulk structures of CsPbI3 and CsPbBr3, respectively.

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Fig. 4. (a) In- situ PL spectra during a CsPbI3 to CsPbBr3 QD conversion. (b) PL spectrum at the reaction time of 80s (green) fitted by the sum of three Gaussian peaks (wine), with separate P1 (red), P2 (green), and P3 (blue) components. (c) PL peak center, (d) PL intensities, and (e) PL linewidth of the deconvoluted PL spectra in figure (a).


Supported by : 한국세라믹기술원


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