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Thermally Activated Delayed Photoluminescence From Pyrenyl-Functionalized CdSe Quantum Dots

Thermally Activated Delayed Photoluminescence From Pyrenyl-Functionalized CdSe Quantum Dots

Cédric Mongin, Pavel Moroz, Mikhail Zamkov, Felix N Castellano

Nat Chem. 2018 Feb;10(2):225-230.

PMID: 29359748

Abstract:

The generation and transfer of triplet excitons across semiconductor nanomaterial-molecular interfaces will play an important role in emerging photonic and optoelectronic technologies, and understanding the rules that govern such phenomena is essential. The ability to cooperatively merge the photophysical properties of semiconductor quantum dots with those of well-understood and inexpensive molecular chromophores is therefore paramount. Here we show that 1-pyrenecarboxylic acid-functionalized CdSe quantum dots undergo thermally activated delayed photoluminescence. This phenomenon results from a near quantitative triplet-triplet energy transfer from the nanocrystals to 1-pyrenecarboxylic acid, producing a molecular triplet-state 'reservoir' that thermally repopulates the photoluminescent state of CdSe through endothermic reverse triplet-triplet energy transfer. The photoluminescence properties are systematically and predictably tuned through variation of the quantum dot-molecule energy gap, temperature and the triplet-excited-state lifetime of the molecular adsorbate. The concepts developed are likely to be applicable to semiconductor nanocrystals interfaced with molecular chromophores, enabling potential applications of their combined excited states.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP19694021	1-Pyrenecarboxylic acid		19694-02-1	Price

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