Abstract

Currently Er3+-doped fluorides are being used as upconversion phosphors to enhance the efficiency of Si solar cells, to our knowledge. However, this enhancement is strongly limited owing to the small solar spectral range around 1540nm that is used. We demonstrate that Ho3+-doped oxyfluoride glass ceramics are adequate to enlarge the Si sub-bandgap region around 1170nm that can be transformed into higher-energy photons, showing an upconversion efficiency 2 orders of magnitude higher than the precursor glass. As these materials are transparent at 1540nm, they can be used complementarily with Er3+-doped phosphors for the same purpose.

© 2008 Optical Society of America

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