Preparation and Study of Photoswitchable Fluorescence Nanoparticles based on Spirobenzopyran

摘要

The preparation and performance characterization of spirobenzopyran-based photochromic nanohybrids less than 50 nm in diameter with photoswitchable fluorescence are presented. The nanohybrids were fabricated by means of a modified miniemulsion polymerization process, in which hydrophobic spirobenzopyran and the matched fluorescent dyes are covalently attached to polymer chains and noncovalently embedded in the nanoscale crosslinked polymeric matrix, respectively. The obtained nanohybrids with high relative fluorescence quantum yield (Q) exhibited superior fluorescent photoswitchable performance due to the effective photoinduced intermolecular energy transfer, and also the thermal stability of photomerocyanine was improved.