Abstract
High-efficiency photoluminescence quaternary hexagon Zn–Cu–In–S (ZCIS) nanoplatelets (NPls) have been synthesized by a two-step cation exchange method, which starts with the In2S3 NPls followed by the addition of Cu and Zn. It is the first time that In2S3 NPls are used as templates to synthesize ZCIS NPls. In this paper, the reaction temperature of In2S3 is essential for the formation of NPls. The photoluminescence wavelength of NPls can be tuned by adjusting the temperature of Cu addition. To enhance the stability of the resulting NPls and to improve their optical properties, we introduced Zn2+ and obtained ZCIS NPls by cation exchange on the surface. It is worth noting that the obtained ZCIS NPls show a shorter fluorescence lifetime than other ternary copper sulfide-based NPls. This work provides a new way to synthesize high-efficiency, nontoxic, and no byproduct ZCIS NPls.
Highlights
Two-dimensional (2D) colloidal semiconductor nanoplatelets (NPls) have attracted scientific and practical interest due to their unique anisotropic optical and electronic properties
Contrary to previously published procedures, in this paper, we propose to use In2S3 NPls as a template to obtain ZCIS NPls through a two-step cation exchange reaction: partial replacement of In3+ ions with Cu+ followed by addition of Zn ions
This paper demonstrated that In2S3 NPls can be successfully used as nanotemplates to prepare highly luminescent ZCIS NPls through a two-step cation exchange reaction
Summary
Two-dimensional (2D) colloidal semiconductor nanoplatelets (NPls) have attracted scientific and practical interest due to their unique anisotropic optical and electronic properties. The focus on the synthesis and utilization of colloidal semiconductor nanocrystals (NCs) has been shifted AgInS2 tcoowmaprdoumndosr.e15−“g1r8eeAnmero”ngterontahreyrsC, uCInuSIn2,S2C(uCInISSe)[2], or has been the most popular semiconductor for light-absorbing or light-emitting applications.[17−21] CIS has a direct bulk band gap of 1.45 eV22−24 and the Bohr radius of exciton of 4.1 nm. Due to the quantum confinement effect in (quasi) spherical CIS. The standard approach to increase the quantum yield in CIS NCs involves the partial cation exchange with Zn, resulting in the “core−gradient shell” ZCIS structure with the core enriched with Cu and In and the shell with Zn. Unlike (quasi-)spherical NCs, CIS(Se) NPls were not widely established and rarely published.[6,30,31] Earlier, Lox et al used
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