Annihilation upconversion in ambient atmosphere

Published on October 28, 2013

At presence of molecular oxygen, the energy stored at the triplet ensembles of variety of organic molecules, capable of energy transfer via an emissive process (phosphorescence) or a non-emissive process (triplet-triplet transfer) is actively dissipated.

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The reason for this is the process of singlet oxygen generation. Importantly, singlet oxygen is a highly reactive species, leading to oxidation of the photoactive molecules, followed by further los of efficiency. In this work we demonstrate organic solvents, specially designed and optimized to deliver long-term protection (over 1000 h) against the molecular oxygen quenching, thus comparable efficiencies of the specific process in oxygen-free environment and under ambient conditions are achieved.

Baluschev Group | Max Planck Institute for Polymer Research, Mainz, Germany

Dr. Stanislav Baluschev is leading the Photophysical Chemistry Group at the Department of Prof. Dr. Katharina Landfester, MPIP. His current research interests include optical properties of conjugated polymers and their compositions and especially the process of noncoherent annihilation photon energy upconversion in multicomponent organic systems.

Christian Wohnhaas obtained his PhD-degree in 2013 from MPIP, the title of his doctoral thesis is “Photon Upconversion in Nanocapsules”.

Filippo Marsiko is member of “Reactions at the Interface Polymer Synthesis”-group, his main research topic is the synthesis of organophosphates.

Dr. Frederik Wurm is leading the Reactions at the Interface and Polymer Synthesis Group at the Department of Prof. Dr. Katharina Landfester, MPIP.

Sources

“Long-term stable photoactive composition, such as phosphorescent composition or TTA-photon upconversion composition

European patent application: Nr. 13 185 751.8 / 2013

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