Bright Blue Photoluminescence Emitted from the Novel Hyperbranched Polysiloxane‐Containing Unconventional Chromogens

Abstract

A blue fl uorescence-emitting hyperbranched polysiloxane simultaneously containing hydroxyl and epoxy groups (HPHEp) has been developed through one-step A 2 + B 3 melt polycondensation between methoxyl groups of (3-glycidyloxypropyl)trimethoxysilane (A-187) and hydroxyl groups of neopentyl glycol under catalyst-free conditions. The emission intensity of the HPHEp in ethanol solution continuously arises in pace with raising its concentration, and the brightest luminescence is observed even in the 100% solid state. Studies show that the aggregation of oxygen-rich heteroatoms from the hydroxyl and epoxy groups is assigned to the luminous source. Intriguingly, the HPHEp displays reinforced photoluminescence after polyetherifi cation by 20 wt% polyether amine M2070; nevertheless, the modifi ed polymer represents diminished emission intensity along with increasing the polyether content. Thus, this investigation offers a new methodology of designing photoluminescent materials.

Clusterization-triggered emission: Uncommon luminescence from common materials

“…In 2007, some of us reported on colloidal suspensions of the nonaromatic poly[(maleic anhydride)-alt-(vinyl acetate)] (PMV) emit blue light under UV irradiation while its diluted solution was nonluminescent, exhibiting properties comparable to AIEgens [50,51] . Similar effects have been observed prior to or since 2007 for siloxanes [52][53][54][55][56][57] , poly(amidoamine) (PAMAM) [58][59][60][61] and polypeptides [62][63][64] . We have denoted this process as clusterization-triggered emission (CTE) [51,[65][66][67] .…”

Nonconventional macromolecular luminogens with aggregation‐induced emission characteristics

“…Figure lists some of the most common moieties for the construction of organic fluorophores, like polycyclic aromatic hydrocarbons (PAH), aromatic amines, BODIPY, and fluorescein. With regard to the nonconventional luminogens, so far, more and more examples including molecular and macromolecular, synthetic and natural occurring compounds, such as PAMAM, PEI, starch, cellulose, bovine serum albumin (BSA), PAN, PNHSMA, glucose, poly(acryl acid) (PAA), perfluorosulfonate ionomers (PFSIs), and supramolecular systems are found . For each system, people try to identify the exact contributing moieties.…”

“…Generally, these polymers involve electron‐rich heteroatoms, such as nitrogen (N), oxygen (O), sulfur (S), phosphorus (P), and/or unsaturated C = C and C≡N subgroups. Apart from the most intensively investigated archetypal poly(amidoamine)s (PAMAM), other macromolecular nonconventional luminogens, such as poly(amino ester)s (PAE), poly(ether amide)s (PEA), polyacrylonitrile (PAN), poly( N ‐vinylpyrrolidone) (PVP), polyethylenimines (PEI), polyureas (PU), sulfonated acetone–formaldehyde (SAF) condensates and derivatives, poly( N ‐hydroxysuccinimide methacrylate) (PNHSMA), polysiloxanes, and even supramolecular assemblies have been becoming increasingly eye‐catching owing to their unique intrinsic emissions. Compared with conventional luminophors, they normally enjoy the advantages of good hydrophilicity, facile preparation, environment‐friendliness, outstanding biocompatibility, and so forth, which render them highly suitable for biological and medical applications.…”

Multiring-induced multicolour emission: hyperbranched polysiloxane with silicon bridge for data encryption

“…In our previous work, we have developed various HBPSi and focused on the relationship between their functional groups and luminescence performance. In addition, the application of HBPSi as an air purifier 20 or Fe 3+ probe [21][22][23][24] has also been successfully realized. However, some scientific issues with HBPSi still await further investigation.…”