A Waterborne Polyurethane‐Based Dye with Green Fluorescence Excited by Visible Light. Issue 24 (22nd June 2021) - Li, Mingjun
Abstract: A waterborne aminofluorescein polyurethane‐based dye (AF‐WPU) with green fluorescence excited by visible light was synthesized by anchoring aminofluorescein (AF) to waterborne polyurethane chains. The structural characteristics of AF‐WPU was confirmed by means of 1 H‐NMR, FT‐IR and UV‐vis absorption. Compared with AF, there is a hypsochromic shift, and a new absorption peak generating in the UV‐vis spectra of AF‐WPU. Meanwhile, AF‐WPU emited excellent fluorescence. The fluorescence intensity of AF‐WPU increased five times at the same concentration. It is found that the fluorescence intensities of AF‐WPU decreaseed with increased temperature, and increased first and then decreased with increasing concentration. The fluorescence of AF‐WPU is very stable and insensitive to quenching agents. Moreover, AF‐WPU which excited by visible light is less phototoxic to health, and has a broad prospect in practical applications. Abstract : Amino‐fluorescein(AF) and waterborne aminofluorescein polyurethane‐based dye (AF‐WPU) can be clearly seen in the luminescence diagram under the same concentration.It is obvious that the fluorescence intensity of AF‐WPU is much stronger than that of AF. AF‐WPU is not only safe, non‐toxic, very low mobility and permeability, but also has the characteristics of absorption peak width, high quantum yield and stable luminescence performance. Moreover, it has a good development and wide application prospect in sensing, coding, optoelectronics, etc.