Photoluminescence enhancement of dye-doped polymer films covered with electrospun nanofibers

The photoluminescence (PL) enhancement of a dye-doped polymer film covered with electrospun nanofibers has been demonstrated. The time variation of the PL intensity is measured while nanofibers are being formed on the surface of the sample by electrospinning. The PL intensity of the sample gradually increases during nanofiber electrospinning. The PL enhancement occurs along the front direction of the sample rather than along the horizontal direction. The total enhancement factor measured in an integrating sphere is approximately 1.2. These effects are brought about by improving the excitation efficiency and light extraction caused by the light scattering in the nanofibers.