Synthesis of Broad Color-emitting CuInS2/ZnS Quantum Dots at Low Temperature

doi:10.7503/cjcu20150415

Abstract

Abstract:

CuInS₂/ZnS(CIS/ZnS) quantum dots(QDs) were synthesized below 200 ℃ with zinc diethyl dithiocarbamate(ZDC) as ZnS precursor materials and trioctylphosphine(TOP) as the main capping ligands. The influence of ZDC amount, shell growth temperature and ligands on the optical properties and quantum yield of CIS/ZnS quantum dots were investigated. The results showed that the growth of ZnS shell could happen above 150 ℃ and ZnS growth speed was accelerated by increasing temperature. The absorption peak of prepared CIS/ZnS using TOP as ligands was defined as exctionic absorption through photoluminescence(PL) spectromety and X-ray diffraction analysis. The samples were characterized by PL spectrometer, high resolution transmission electron microscope, energy dispersive X-ray spectrometer and Fourier transform infrared spectrometer. The results showed that ligands of TOP and dodecanethiol were overcoated on the surface of nanoparticles as organic layer, which would affect optical properties and crystal growth speed. TOP could increase the shell growth speed and the CIS/ZnS QDs with uniform size were obtained. The PL emission wavelength could be extended to 550 nm.

Key words: Copper indium sulfide/zinc sulfide(CIS/ZnS) quantum dots, Core-shell structure, Trioctylphosphine ligand, Excitonic absorption

CLC Number:

O611.4

TrendMD:

FU Min, LUAN Weiling, TU Shantung, MLECZKO Leslaw. Synthesis of Broad Color-emitting CuInS₂/ZnS Quantum Dots at Low Temperature[J]. Chem. J. Chinese Universities, 2015, 36(10): 1865.

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Synthesis of Broad Color-emitting CuInS₂/ZnS Quantum Dots at Low Temperature

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