Er3+/Yb3+ co-doped ZnS quantum dots: structure, optical properties and up-conversion luminescence
L. T. T. Ngan, V. H. Yen, N. T. Hien, N. T. K. Van, N. V. Ha, N. T. Luyen, N. D. Vinh, N. X. Ca
TL;DR
This paper studies Er3+/Yb3+ co-doped ZnS quantum dots and their upconversion luminescence properties for potential use in optoelectronic devices.
Contribution
The study reports the first detailed investigation of upconversion luminescence in Er3+/Yb3+ co-doped ZnS quantum dots.
Findings
Er3+/Yb3+ co-doped ZnS QDs exhibit green and red upconversion bands under 980 nm excitation.
The UC emission intensity is strongly dependent on Yb3+ concentration.
The UC process is governed by a two-photon mechanism with efficient energy transfer from Yb3+ to Er3+.
Abstract
Er3+/Yb3+ co-doped ZnS quantum dots (QDs) were synthesized using a wet chemical approach and studied for their structural and optical properties, as well as upconversion (UC) luminescence. X-ray diffraction (XRD) confirmed the formation of phase cubic ZnS, where rare-earth Er3+ and Yb3+ ions were effectively incorporated into the host lattice without secondary phases. X-ray photoelectron spectroscopy (XPS) analyses further verified the trivalent states of Er and Yb ions in the QDs. For the first time, the UC luminescence phenomenon in Er3+/Yb3+ co-doped ZnS QDs was studied and explained in detail. Under 980 nm excitation, the Er3+/Yb3+ co-doped ZnS QDs exhibited green and red UC bands, dominated by the green emission, whose intensity strongly depended on Yb3+ concentration. Power-dependent and lifetime measurements indicated that the UC process was primarily governed by a two-photon…
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Taxonomy
TopicsLuminescence Properties of Advanced Materials · Quantum Dots Synthesis And Properties · Solid State Laser Technologies