Kenta Miura
Gunma University, Japan
Title: Luminescent periodic microstructures for medical applications
Biography
Biography: Kenta Miura
Abstract
Various works on silicon (Si)-based luminescent materials (such as Si nanocrystal (Si-nc)) utilizing the quantum confinement effect have been reported. A typical fabrication method of Si-ncs is co-sputtering of Si and SiO2. Blue-, red-, white-, and near-infrared-light emissions were observed from such co-sputtered films. However, emission efficiencies of such Si-based luminescent materials remain low. In particular, extraction efficiencies seem to be very low because of the total reflections at their surfaces. Integrating periodic microstructures on light-emitting diodes (LEDs) is one way of achieving a high extraction efficiency. It was also reported that two-dimensional (2-D) periodic microstructures can effectively extract the light emitted from active layers of LEDs according to diffraction laws. This paper will demonstrate2-D periodic microstructures composed of Si-based luminescent thin films by using co-sputtering Si and SiO2, simple double-interference exposure, and plasma etching. An enhanced photoluminescence peak around a wavelength of 800 nm observed from a luminescent periodic microstructure will be presented. Because Si-based materials have biocompatibility and the transmittance of a human body at the wavelength 800 nm, I believe that Si-based light-emitting devices for medical applications can be realized by utilizing our technologies. Details will be presented at the conference.