High‐Yield Excited Triplet States in Pentacene Self‐Assembled Monolayers on Gold Nanoparticles through Singlet Exciton Fission |
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Authors: | Daiki Kato Dr Hayato Sakai Prof Nikolai V Tkachenko Prof Taku Hasobe |
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Institution: | 1. Department of Chemistry, Faculty of Science and Technology, Keio University, Kanagawa, Japan;2. Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland |
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Abstract: | One of the major drawbacks of organic‐dye‐modified self‐assembled monolayers on metal nanoparticles when employed for efficient use of light energy is the fact that singlet excited states on dye molecules can be easily deactivated by means of energy transfer to the metal surface. In this study, a series of 6,13‐bis(triisopropylsilylethynyl)pentacene–alkanethiolate monolayer protected gold nanoparticles with different particle sizes and alkane chain lengths were successfully synthesized and were employed for the efficient generation of excited triplet states of the pentacene derivatives by singlet fission. Time‐resolved transient absorption measurements revealed the formation of excited triplet states in high yield (172±26 %) by suppressing energy transfer to the gold surface. |
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Keywords: | gold nanoparticles pentacene self-assembled monolayers singlet fission |
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