Hyperbranched unsaturated polyphosphates as a protective matrix for long-term photon upconversion in air.
Filippo Marsico1, Andrey Turshatov, Rengin Peköz
1Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.
Journal of the American Chemical Society
|July 11, 2014
Summary
Researchers developed new poly(phosphoester)s to protect organic molecules from oxygen damage. These materials enable efficient solar energy conversion by preventing singlet oxygen quenching, paving the way for advanced solar cells and upconversion devices.
Area of Science:
- Materials Science
- Photochemistry
- Organic Chemistry
Background:
- Triplet states in organic molecules are prone to energy dissipation via molecular oxygen.
- Photoexcited singlet oxygen causes rapid oxidation, reducing efficiency and causing side effects in photoactive systems.
Purpose of the Study:
- To develop novel hyperbranched unsaturated poly(phosphoester)s for efficient singlet oxygen scavenging.
- To protect photoactive molecules from oxygen-induced degradation and enhance device performance.
Main Methods:
- Synthesis of a structurally diverse library of hyperbranched unsaturated poly(phosphoester)s.
- Evaluation of singlet oxygen scavenging capabilities.
- Testing oxygen sensitivity using triplet-triplet annihilation photon upconversion (TTA-UC).
- Correlation of experimental results with NMR spectroscopy and theoretical calculations.
Main Results:
- The developed poly(phosphoester)s efficiently scavenge singlet oxygen without reacting with ground-state molecular oxygen.
- Photon upconversion efficiencies under ambient conditions were comparable to oxygen-free environments, demonstrating long-term protection.
- NMR spectroscopy and theoretical calculations highlighted the crucial role of the phosphate center in the protective mechanism.
Conclusions:
- The novel poly(phosphoester)s offer effective protection against singlet oxygen quenching.
- These materials are promising for developing efficient and sustainable solar energy conversion devices, including solar cells and solar upconversion systems.
- The findings open new avenues for harnessing broad-band sunlight for energy applications.
