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Green-to-Blue Triplet Fusion Upconversion Sensitized by Anisotropic CdSe Nanoplatelets

preprint
revised on 30.03.2020 and posted on 31.03.2020 by Zachary A. VanOrman, Alexander S. Bieber, Sarah Wieghold, Lea Nienhaus

Green-to-blue photon upconversion bears great potential in photocatalytic applications. However, current hybrid inorganic-organic upconversion schemes utilizing spherical CdSe nanocrystals are often limited by energetic polydispersity, low quantum yields and an additional tunneling barrier resulting from the necessity of surface-passivating inorganic shells. In this contribution, we introduce anisotropic CdSe nanoplatelets as triplet sensitizers. Here, quantum confinement occurs in only one direction, erasing effects stemming from energetic polydispersity. We investigate the triplet energy transfer from the CdSe nanoplatelets to the surface-bound triplet acceptor 9-anthracene carboxylic acid. We further focus on the influence of nanoplatelet stacking and singlet back transfer on the observed upconversion efficiency. We obtain an upconversion quantum yield of 5.4% at a power density of 11 W/cm using the annihilator 9,10-diphenylanthracene, and a low efficiency threshold Ith of 237 mW/cm2.

Funding

DMR-1644779

History

Email Address of Submitting Author

lnienhaus@fsu.edu

Institution

Florida State University

Country

USA

ORCID For Submitting Author

0000-0003-1412-412X

Declaration of Conflict of Interest

No conflict of interest to declare.

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