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Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
Published on: September 18, 2019
Reversed Förster Resonance Energy Transfer in ReS2-Based Heterostructures
Shi Guo1, Cheng Sun2, Sung-Gyu Lee1,3
1School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Researchers demonstrated a novel energy transfer (ET) process enabling energy flow from lower-energy donors to higher-energy acceptors without spectral overlap. This breakthrough in ReS2/hBN/TMD heterostructures enhances quantum yield in low-dimensional materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Quantum Chemistry
Background:
- Energy transfer (ET) is crucial for energy-harvesting and optoelectronic devices.
- Conventional Förster resonance energy transfer (FRET) necessitates spectral overlap and downhill energy flow.
- Developing novel ET mechanisms is key to advancing quantum efficiency in materials.
Purpose of the Study:
- To demonstrate an unconventional FRET process.
- To enable energy transfer from lower-energy donors to higher-energy acceptors.
- To explore ET in ReS2/hBN/TMD heterostructures.
Main Methods:
- Fabrication of ReS2/hBN/TMD heterostructures.
- Transient absorption spectroscopy to probe excitonic states.
- Photoluminescence spectroscopy to quantify energy transfer efficiency and enhancement.
Main Results:
- Demonstrated efficient ET from ReS2 to TMD monolayers despite lower donor energy.
- Observed reversed FRET attributed to high-energy excitonic states in ReS2 due to band-nesting.
- Achieved over 30-fold photoluminescence enhancement, >63% transfer efficiency, and sub-80 ps transfer time.
Conclusions:
- Unconventional FRET without spectral overlap is feasible.
- Band-nesting effects in ReS2 enable reversed energy transfer.
- This approach offers a new pathway for enhancing quantum yield in low-dimensional materials.
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