Improving photoluminescence of poly(9‐vinylcarbazole)/4,7‐diphenyl‐1,10‐phenanthroline/tris‐(8‐hydroxyquinoline) aluminum fibers via coaxial electrospinning

Abstract

Solutions of poly(9‐vinylcarbazole)/4,7‐diphenyl‐1,10‐phenanthroline (PVK/Bphen) and poly(9‐vinylcarbazole)/tris‐(8‐hydroxyquinoline) aluminum (PVK/Alq3) were individually delivered either to the inner or the outer needle of a coaxial spinneret for electrospinning to prepare green luminescent PVK/Bphen/Alq3 composite fibers. The influence of both flow rate and applied voltage on the photoluminescence of the composite fibers was evaluated. Scanning electron microscopy showed ribbon‐like fibers with uneven surfaces and thickness of about 5 µm. Raman spectroscopy and fluorescence microscopy revealed that Bphen was homogenously dispersed in the PVK fibers; Alq3 was not. Photoluminescence shows strong evidence that there are marked conditions where emission of the co‐electrospun PVK/Bphen/Alq3 fibers significantly improved as compared with those produced by simple electrospinning. It is suggested that the enhanced dispersion of the Alq3 allowed a more efficient energy transfer from the PVK to the Alq3. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44019.

Effect of annealing‐induced interfacial demixing on crystallization of PEO confined in coaxial electrospun nanofibers

“…Compared to conventional electrospinning, coaxial electrospinning, which adopts a spinneret composed of two coaxial capillaries to simultaneously deliver two different solutions to form the fibers with desired structure, has attracted more and more interests in fabricating bicomponent fibers . Due to the advantage of combining the properties of the core and sheath materials, the composite fibers are promising for a variety of applications, such as multifunctional textiles, drug encapsulation and release, sensitive biochemical sensors, scaffolds for tissue engineering, and conductive materials . Special morphology and structures, such as a continuous core–shell structure, hollow structure, discontinuous core–shell structure, blend‐like morphology, and so on, can be obtained by coaxial electrospinning via controlling the preparation conditions.…”