Abstract

An overview of advances in sol–gel processing methods for phosphors with different possible optical applications will be presented, highlighting examples based on lanthanide-doped materials. Specifically, new emerging applications have been promoted, using spectral conversion phosphors based on down-shifting, down-conversion or quantum-cutting and up-conversion processes. A brief perspective is given in particular on the potential of sol–gel derived lanthanide-doped materials for down-conversion and up-conversion for integration with photovoltaic solar cells in order to reduce the thermalization and transparency problems, which limit their efficiency, as well as their application in other optoelectronic technologies. This chapter shows the potential of sol–gel method to obtain down and up conversion materials based on a variety of compositions such as fluorides, oxides and oxyfluorides with different geometries.

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