title: Blue, green, and orange-red emission from polystyrene microbeads for solid-state white-light and multicolor emission.
abstract: Solid-state white-light emission was achieved from polystyrene (PS) microbeads incorporated with fluorophores based on perylene bisimide (PBITEG) and oligo(p-phenylenevinylene) (OPV) as acrylic cross-linkers. The PS beads incorporated with only PBITEG gave intense orange-red emission; PS incorporated with OPV exhibited blue-emission, whereas a series of polymers incorporating both cross-linkers exhibited varying shades of white-light emission. One of the PS samples, PS-PBITEG-6.25-OPV-4.28 (PBITEG incorporation: 6.25 × 10(-7) mole; OPV incorporation: 4.28 × 10(-7) mol), exhibited pure white-light emission in the powder form with CIE coordinates (0.33, 0.32). The rigid aromatic cross-linkers were incorporated into the PS backbone in a two-stage dispersion polymerization to afford PS beads in the size range 2 to 3 μm. The incorporation of fluorophores as cross-linkers enabled covalent attachment of the dye to the polymer backbone, avoiding dye leakage besides avoiding aggregation-induced fluorescence quenching.
authors.affiliation: Polymer Science and Engineering Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India.
authors.forename: Swapnil L
authors.initials: SL
authors.lastname: Sonawane
authors.forename: S K
authors.initials: SK
authors.lastname: Asha
mesh_terms: D066241:Carbon-13 Magnetic Resonance Spectroscopy; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007094:Imides / Q000138:chemical synthesis / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008856:Microscopy, Fluorescence; D008863:Microspheres; D010569:Perylene / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D011137:Polystyrenes / Q000138:chemical synthesis / Q000737:chemistry*; D011145:Polyvinyls / Q000138:chemical synthesis / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy
chemical_list: D005456:Fluorescent Dyes; D007094:Imides; D011137:Polystyrenes; D011145:Polyvinyls; C530822:oligo(p-phenylene vinylene); C510697:perylene bisimide; D010569:Perylene