24471-30-5Relevant articles and documents
Fluorescence Colour Control in Perylene-Labeled Polymer Chains Trapped by Nanotextured Silicon
Ivanova, Elena,Juodkazis, Saulius,Kusano, Hazuki,Linklater, Denver P.,Shoji, Tatsuya,Takao, Ryota,Tsuboi, Yasuyuki,Ushiro, Kenta,Yuyama, Ken-ichi
supporting information, (2022/02/01)
The ability to modulate, tune, and control fluorescence colour has attracted much attention in photonics-related research fields. Thus far, it has been impossible to achieve fluorescence colour control (FCC) for material with a fixed structure, size, surrounding medium, and concentration. Here, we propose a novel approach to FCC using optical tweezers. We demonstrate an optical trapping technique using nanotextured Si (black-Si) that can efficiently trap polymer chains. By increasing the laser intensity, the local concentration of perylene-labelled water-soluble polymer chains increased inside the trapping potential. Accordingly, the excimer fluorescence of perylene increased while the monomer fluorescence decreased, evidenced by a fluorescence colour change from blue to orange. Using nanostructure-assisted optical tweezing, we demonstrate control of the relative intensity ratio of fluorescence of the two fluorophores, thus showing remote and reversible FCC of the polymer assembly.
Fluorescence upconversion by triplet-triplet annihilation in all-organic poly(methacrylate)-terpolymers
Bocklitz, Thomas,Dietzek, Benjamin,G?rls, Helmar,Hager, Martin D.,Schmidt, Benny,Sittig, Maria,W?chtler, Maria,Zechel, Stefan
, p. 4072 - 4079 (2020/03/04)
Fluorescence upconversion by triplet-triplet annihilation is demonstrated for a fully polymer-integrated material, i.e. in the limit of restricted diffusion. Organic sensitizer and acceptor are covalently attached to a poly(methacrylate) backbone, yielding a metal-free macromolecular all-in-one system for fluorescence upconversion. Due to the spatial confinement of the optically active molecular components, i.e. annihilator and sensitizer, UC by TTA in the constrained polymer system in solution is achieved at exceptionally low averaged annihilator concentrations. However, the UC quantum yield in the investigated systems is found to be low, highlighting that only chromophores in specific local surroundings yield upconversion in the limit of restricted diffusion. A photophysical model is proposed taking the heterogeneous local environment within the polymers into account.
Organic photoredox catalyst with substrate-capture ability: A perylene derivative bearing urethane moiety for reductive coupling of ketones and aldehydes under visible light
Okamoto, Shusuke,Tsujioka, Hiroki,Sudo, Atsushi
supporting information, p. 369 - 372 (2018/03/05)
A perylene derivative bearing a urethane moiety served as an efficient photoredox catalyst for the reductive coupling of ketones and aldehydes under visible light, implicating that the urethane moiety captured substrates through hydrogen bonds to lower the LUMO levels of the captured substrates, thus promoting single electron transfer from the reductant anion radical of the perylene moiety to the substrates.