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High‐Yield Excited Triplet States in Pentacene Self‐Assembled Monolayers on Gold Nanoparticles through Singlet Exciton Fission
Author(s) -
Kato Daiki,
Sakai Hayato,
Tkachenko Nikolai V.,
Hasobe Taku
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201601421
Subject(s) - pentacene , singlet fission , excited state , photochemistry , monolayer , colloidal gold , chemical physics , singlet state , exciton , nanoparticle , chemistry , ultrafast laser spectroscopy , materials science , nanotechnology , atomic physics , spectroscopy , physics , layer (electronics) , quantum mechanics , thin film transistor
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.