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. 2021 Sep 14;11(9):2390.
doi: 10.3390/nano11092390.

Precise Control of Green to Blue Emission of Halide Perovskite Nanocrystals Using Terbium Chloride as Chlorine Source

Wenqiang Deng  1 , Ting Fan  1 , Jiantao Lü  2 , Jingling Li  1 , Tingting Deng  2 , Mingqi Liu  1
Affiliations

Precise Control of Green to Blue Emission of Halide Perovskite Nanocrystals Using Terbium Chloride as Chlorine Source

Wenqiang Deng et al. Nanomaterials (Basel). .

Abstract

CsPbClxBr3-x nanocrystals were prepared by ligand-assisted deposition at room temperature, and their wavelength was accurately adjusted by doping TbCl3. The synthesized nanocrystals were monoclinic and the morphology was almost unchanged after doping. The fluorescence emission of CsPbClxBr3-x nanocrystals was easily controlled from green to blue by adjusting the amount of TbCl3, which realizes the continuous and accurate spectral regulation in the range of green to blue. This method provides a new scheme for fast anion exchange of all-inorganic perovskite nanocrystals in an open environment at room temperature.

Keywords: nanocrystalline; room temperature assisted recrystallization; spectrum control.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
XRD patterns of CsPbClxBr3-x nanocrystals with different halogen components.
Figure 2
Figure 2
(a) TEM images of CsPbBr3 nanocrystals and (b) CsPbCl1Br2 nanocrystals.
Figure 3
Figure 3
(a) The XPS spectrum of CsPbCl1Br2 nanocrystals; (b) XPS spectra of Cs 3d in CsPbCl1Br2 nanocrystals; (c) XPS spectra of Pb 4f in CsPbCl1Br2 nanocrystals; (d) XPS spectra of Cl 2p in CsPbCl1Br2 nanocrystals; (e) XPS spectra of Br 3d in CsPbCl1Br2 nanocrystals.
Figure 4
Figure 4
(a) Ultraviolet absorption spectra of CsPbClxBr3-x nanocrystals with different halogen components; (b) the fluorescence emission spectra of CsPbClxBr3-x nanocrystals with different halogen components (from left to right are CsPbCl2Br1, CsPbCl1.5Br1.5, CsPbCl1Br2, CsPbCl0.6Br2.4, CsPbCl0.33Br2.67, and CsPbBr3). (c) The CIE diagram of different halogen components of CsPbClxBr3-x nanocrystals. The illustration shows the photos of the synthesized CsPbClxBr3-x nanocrystals under the ultraviolet lamp; (d) fluorescence lifetime diagrams of CsPbClxBr3-x nanocrystals with different halogen components.
See this image and copyright information in PMC

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