<title>Phosphate glasses with great concentration of uranyl and rare earths ions and their films for solar cell concentrators</title>

Abstract

In past years much interest developed in lanthanides and uranyl doped glasses. The energy transfer phenomenon in these glasses produced interest for preparation of highly efficient laser materials and optical transformators. We present some experimental results about mechanism of donor-acceptor interaction and energy transfer in highly activated by uranyl and three-valent rare earths ions cesium-phosphate glasses and luminescent converters and concentrators, using these glasses and films. Our investigation shows that donor-acceptor interaction proceeds by exchange mechanism. Efficiency of energy transfer is about 0.9 for optimal composition of glasses. The quantum yield of luminescence of some lanthanides, in particular Nd<SUP>3+</SUP>, is more than 0.8. The reactive ions sputtering and following thermal treatment allows us to receive optical quality thin films of the discussed materials. Efficiency of transfer and quantum yield of luminescence in films reaches more than 0.8 and 0.7 accordingly. Preliminary experiments of using the glasses as transforming filters in lasers showed their prospectives for the overall laser's efficiency increasing. Collectors made on the base of UO<SUB>2</SUB><SUP>2+</SUP> - Nd<SUP>3+</SUP> glasses allows them to increase on about 40% effectiveness of solar light energy in electric energy transformations by some cells.