Synthesis of Photoluminescence Ag2Te Quantum Dots in Second Near-infrared Window†

doi:10.7503/cjcu20150306

Abstract

Abstract:

Ag₂Te quantum dots(QDs) with an emission in the second near-infrared window were synthesized by tuning the ratio of Ag precursor to Te precursor using 1-octanethiol as a ligand. The products were characterized by transmission electron microscopy(TEM), X-ray powder diffraction(XRD), X-ray photoelectron spectroscopy(XPS), UV-Vis-NIR absorption spectroscopy and the corresponding photoluminescence(PL) spectroscopy. The as-prepared Ag₂Te QDs have a narrow size distribution, good dispersibility with fluorescence emission at 1320 nm and a PL quantum yield of 4.2%.

Key words: Near-infrared, Ag2Te, Quantum dot, Fluorescence

CLC Number:

O657.3

TrendMD:

WANG Jiamei, ZHU Chunnan, ZHU Dongliang, TIAN Zhiquan, LIN Yi, PANG Daiwen. Synthesis of Photoluminescence Ag₂Te Quantum Dots in Second Near-infrared Window^†[J]. Chem. J. Chinese Universities, 2015, 36(7): 1264.

Figures/Tables 4

Fig.1 TEM image(A), XRD pattern(B) and EDX spectrum(C) of the as-prepared Ag2Te nanocrystals Inset of (A) is the HRTEM image of the as-prepared Ag2Te nanocrystals.

Fig.2 XPS spectrum of the as-prepared Ag2Te QDs(A) and XPS peak fitting spectra of Ag3d(B), Te3d(C) and S2p(D)

Fig.3 Absorption and the corresponding fluorescence spectra of the as-prepared Ag2Te QDs

Fig.4 Photostability of the as-prepared Ag2Te QDs

References 42

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Synthesis of Photoluminescence Ag₂Te Quantum Dots in Second Near-infrared Window^†

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