Multicolor emission of nonaromatic linear polysiloxanes based on local conjugation chains

Abstract

Nonaromatic luminophores with aggregation-induced emission and multicolor emission have drawn great attention, however, the linear polymer with multicolor emission remains a huge challenge. Herein, two kinds of linear polysiloxane (LPSi-1...

Uniform and Fluorescent Poly(urea-siloxane) Microspheres: Preparation and Recyclable Use as Sensors for Cr6+ and Fe3+ Detection

“…On the other hand, APDS segments, consisting of oxygen and silicon atoms, are reportedly of good capability to take part in fluorescence emissive clusters. Examples include the emissive polyethylene glycol, which has only oxygen as the heteroatom and is reported able to form clusters; the emission of certain polymers was reportedly enhanced with the presence of siloxane segments thanks to their Si–O coordination bonds having similar properties to double bonds. ,, Therefore, the emission enhancement by the presence of APDS in PUSi is highly expected. By consequence, more APDS in PUSi may lead to easier clustering and higher emission intensity.…”

Multicolor Photoluminescence from Nonconjugated Poly(3,4-dihydropyran) Nanoparticles

“…It is widely known that in some cases the aggregation of NTIL can greatly affect their emission intensity. ,,− If the emitting species is effectively a supramolecular aggregate, the varying temperature may be anticipated to affect the structural organization and rigidity and consequently the emission. For a given chromophore, the photoluminescence quantum yield is inversely proportional to the radiative decay rate and hence proportional to the luminescence lifetime.…”

“…Those containing amide groups are probably the most widespread; ,,− in fact, amide functionalities are able to provide rigidity to the structure, thanks to both the partial sp 2 character of the C–N bond and the ability to form strong H-bonds, and, in specific conditions of rigidity, it can act as a chromophore and emissive center . Additionally, other types of NTIL have been studied, including polyanhydride, , poly­(aminoester), poly­(maleic anhydride-alt-vinyl acetate), , poly­(urea), poly­(urethane), poly­(nitrile), poly­(thioethersulfone), poly­(siloxane), and poly­(alkylborate) . Even in the absence of a sp 2 -hybridized carbon, such as in the case of poly­(ethyleneimine) , and poly­(ethylene glycol), , fluorescence emission was detected.…”

Intrinsic bright green emission from hyperbranched polyphosphate esters: preparation, film fabrication and Fe3+sensing

“…The fluorescence quenching might be caused by the electron transfer from the polymer molecules to the ions. 35,36 It is well known that there are high thermodynamic affinity and faster chelation between the hydroxyl groups and Cr 3+ , Cu 2+ and Fe 3+ , and stable complexes of ions and polymers are formed. Thus, the electron transfer between the polymers and ions is quite easy and fast.…”