Diphenylisobenzofuran Bound to Nanocrystalline Metal Oxides: Excimer Formation, Singlet Fission, Electron Injection, and Low Energy Sensitization
| Autor: | Mark D. Losego, Valeria D. Kleiman, Brandon D. Piercy, M. Alejandra Hermosilla-Palacios, Kenneth Hanson, Bryan Casale, Jess Haney, A. Eugene DePrince, Sean P. Hill, Tanmay Banerjee |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Bilayer 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Excimer Photochemistry 01 natural sciences Nanocrystalline material 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Materials Science General Energy Excited state Singlet fission Singlet state Physical and Theoretical Chemistry Triplet state 0210 nano-technology Spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C. 122:28478-28490 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.8b08599 |
| Popis: | We report the photophysical properties of the dicarboxylated diphenylisobenzofuran dye (1) bound to nanocrystalline metal oxide surfaces. With increased surface loading of 1, emission from the films is significantly quenched but with a small amount of excimer emission at maximum surface loadings. Long-lived triplets were observed by ns TA spectroscopy that are consistent with singlet fission occurring on mesoporous ZrO2. The evolution of these triplets, however, could not be convincingly resolved by our subnanosecond TA spectroscopy. Dye-sensitized devices composed of 1 on a TiO2|Al2O3 core–shell structure exhibited an unusual decrease, increase, and then decrease in Jsc with respect to the thickness of Al2O3. In these films the Al2O3 acts as a tunneling barrier to slow electron injection from the singlet excited state such that singlet fission, and electron injection from the triplet state becomes competitive. Proof-of-principle self-assembled bilayer films that exhibit efficient triplet energy transfer ... |
| Databáze: | OpenAIRE |
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