These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
Main Article.pdf (754.55 kB)
Triplet-Triplet Annihilation Upconversion with Reversible Emission-Tunability Induced by Chemical-Stimuli: a Remote Modulator for Photocontrol Isomerization
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
submitted on 15.09.2020 and posted on 17.09.2020by Yaxiong Wei, Xialei Lv, Haitao Xian, Xiaosong Cao, Chuluo Yang, Fan Ni
annihilation upconversion (TTA-UC) has been widely studied, but color-tunable
TTA-UC system triggered by chemical stimuli has not yet been proposed. Herein,
reversible acid/base switching of TTA-UC emission wavelength is achieved for
the first time by a simple platform, composed of a direct singlet-triplet (S0-T1)
absorpting photosensitizer, and pH-responsive 9,10-di(pyridin-4-yl)anthracene
(DPyA) as acceptor. The photosensitizer-acceptor pair exhibits efficient UC
emission (quantum yield up to 3.3%, anti-Stokes shift up to 0.92 eV) with
remarkable contrast upon base/acid treatment (Δλem,max = 82 nm, 0.46 eV). In a proof-of-concept study,
the color-adjustable TTA-UC emission was applied as a remote modulator to
photo-control reversible chemical reactions for the first time. This platform
enriches the portfolio of color-switchable TTA-UC, and the mechanism would
inspire further development of smart UC systems and extend the application
field of upconversion.