International Journal of Physics | Vol. 9, No. 4, April 2018 | pp. 25–32
DOI: 10.46882/2018/IJP/000096
Research Article
Title: Resonant Energy Transfer Dynamics between Colloidal PbS Quantum Dots and Monolayer Tungsten Disulfide
Names of Authors: T. H. Nguyen¹, M. G. Richter²
Authors’ Affiliations: ¹Department of Physics, Vietnam National University, Hanoi, Vietnam; ²Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
Abstract: Hybrid semiconductor nanostructures combining zero-dimensional quantum dots and two-dimensional layers provide new opportunities for developing advanced light-harvesting systems. This paper examines the non-radiative Förster resonant energy transfer (FRET) dynamics between colloidal lead sulfide (PbS) quantum dots and monolayer tungsten disulfide (WS²). The hybrid interfaces were fabricated via sequential spin-coating routines onto quartz substrates. We performed steady-state photoluminescence and time-resolved single-photon counting measurements at an operating temperature of 300 K. The experimental data reveal a strong 85.0% quenching of the quantum dot photoluminescence emission when coupled to the WS² monolayer. Concurrently, the average fluorescence lifetime of the PbS quantum dots decreased from 5.4 ns down to 0.81 ns. This lifetime reduction yields a calculated FRET efficiency of 85.0% with a corresponding energy transfer rate of 1.05 ns⁻¹. The donor-acceptor separation distance was estimated to be 3.5 nm using the standard Förster mathematical model. Spectral overlap analysis confirms that energy transfer is mediated by the alignment between quantum dot emission and the WS² exciton absorption bands. These rapid energy transfer dynamics show that quantum dot sensitization can significantly enhance near-infrared light absorption in ultra-thin optoelectronic architectures.
Keywords: Quantum dots; transition metal dichalcogenides; resonant energy transfer; fluorescence lifetime; hybrid nanostructures; optoelectronics
Manuscript Timeline: Received: January 04, 2018; Revised: February 17, 2018; Accepted: March 09, 2018; Published: April 11, 2018
Citation: Nguyen, T. H., & Richter, M. G. (2018). Resonant Energy Transfer Dynamics between Colloidal PbS Quantum Dots and Monolayer Tungsten Disulfide. International Journal of Physics, 9(4), 25–32.
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