Tm2+ luminescent materials for solar radiation conversion devices

A solar radiation conversion device is described that comprises a luminescent Tm 2+ inorganic material for converting solar radiation of at least part of the UV and/or visible and/or infra red solar spectrum into infrared solar radiation, preferably said infrared solar radiation having a wavelength of around 1138 nm; and, a photovoltaic device for converting at least part of said infrared solar radiation into electrical power.RST/Radiation, Science and TechnologyApplied Science