4 years ago

Photon Upconversion Using Baird-Type (Anti)Aromatic Quinoidal Naphthalene Derivative as a Sensitizer

Photon Upconversion Using Baird-Type (Anti)Aromatic Quinoidal Naphthalene Derivative as a Sensitizer
Siamak Shokri, Gary P. Wiederrecht, A. Jean-Luc Ayitou, David J. Gosztola
A naphtho-p-quinodimethane (QDM) exhibiting Baird’s 4n – π antiaromaticity was used as green photons-harvesting chromophore to sensitize perylene (Per) leading to upconverted blue photoluminescence. The solution phase QDM → Per triplet energy transfer (TET) could not be unraveled via the Stern–Volmer method, but transient absorption measurements revealed that the kinetics of T1 → Tn for QDM (τ = 1.4 μs) was 1 order of magnitude reduced (τ = 0.17 μs) as a result of 3(Per)* formation. Furthermore, we demonstrated that incident light with power densities in the microwatt regime is sufficient to perform photon upconversion using the present set of molecular systems.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b08373

DOI: 10.1021/acs.jpcc.7b08373

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