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Thermally activated delayed photoluminescence from pyrenyl-functionalized CdSe quantum dots
Cédric Mongin1, Pavel Moroz2, Mikhail Zamkov2
1Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA.
Nature Chemistry
|January 24, 2018
Summary
Semiconductor quantum dots and molecular chromophores enable tunable photoluminescence through controlled triplet exciton transfer. This research details a method for merging their properties for advanced optoelectronic applications.
Area of Science:
- Materials Science
- Photochemistry
- Nanotechnology
Background:
- Triplet excitons are crucial for photonic and optoelectronic devices.
- Merging semiconductor quantum dot and molecular chromophore properties is key for technological advancement.
Purpose of the Study:
- To investigate triplet-triplet energy transfer at semiconductor nanomaterial-molecular interfaces.
- To demonstrate tunable photoluminescence by combining CdSe quantum dots with 1-pyrenecarboxylic acid.
Main Methods:
- Utilized functionalized Cadmium Selenide (CdSe) quantum dots with 1-pyrenecarboxylic acid.
- Studied thermally activated delayed photoluminescence.
- Analyzed triplet-triplet energy transfer and reverse triplet-triplet energy transfer dynamics.
Main Results:
- Observed near-quantitative triplet-triplet energy transfer from CdSe quantum dots to 1-pyrenecarboxylic acid.
- Demonstrated a molecular triplet-state reservoir enabling repopulation of the CdSe photoluminescent state.
- Showcased predictable tuning of photoluminescence via quantum dot-molecule energy gap, temperature, and molecular triplet-state lifetime.
Conclusions:
- Developed a strategy for controlling excited-state properties at nanomaterial-molecule interfaces.
- The findings are applicable to various semiconductor nanocrystals interfaced with molecular chromophores.
- Enables potential applications leveraging the combined excited states of quantum dots and molecules.
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