Exploration and Optical Assessment of Mesostable Mesoscopic Structure

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Laser processing of microdroplets suspended in poor solvent has successfully produced nanoparticles of organic dye polymer without damage to optical properties, with reliable selection of 50nm through 500nm diameter. Resulting monodispersed nanoparticle suspension is useful as material ink to draw pixel patterns on solid or flexible substrates via emerging printing technology for prospective ultrathin flat panel display application.Polyfluorene, with hydrophobic sidechain, did not show energy level change, whereas MEHPPV, with polar sidechain, exhibited blueshift both in photoabsorption and photoemission, not depending on the nanoparticle diameter, which excludes the possible origin of exciton quantum mechanical confinement within nanoparticles. This nondestructive visible laser processing of microdroplets is a promising method to efficiently produce dye polymer nanoparticles with optical responsiveness intact.