Upconversion of Sub-Band-Gap Photons for Silicon Solar Cells
Fischer, Stefan Upconversion denotes the process of absorption of two or more photons followed by the emission of one photon with more energy than the individual energies of each of the previously absorbed photons. The manifold applications for upconverter materials range from bioimaging via theranostics to lasers. This work is concerned with upconversion in materials based on rare-earth ions in regard to the harvesting of solar energy. Due to upconversion th...