Photoinduced synthesis of fluorescent hydrogels without fluorescent monomers

A fluorescent monomer-free one-step strategy is developed for the synthesis of fluorescent acrylamide gels, using inexpensive and commercially available rhodamine B as the hydrogen donor in a type II photoinitiation system. The obtained hydrogels are fluorescent and have limited fluorophore leaching over time, due to the covalent bond formed between the polymer network and rhodamine dye.