Broadband down-conversion in Bi³⁺-Yb³⁺-codoped yttrium and yttrium-aluminum oxides

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• 作者：Ya. Zhydachevskii ; L. Lipi艅ska ; M. Baran ; M. Berkowski ; A. Suchocki ; A. Reszka
• 关键词：Oxides ; Sol&ndash ; gel growth ; Photoluminescence spectroscopy ; Powder diffraction ; Luminescence ; Optical properties
• 刊名：Materials Chemistry and Physics
• 出版年：15 January, 2014
• 年：2014
• 卷：143
• 期：2
• 页码：622-628
• 全文大小：2379 K

文摘

Comparative study of the broadband down-conversion processes in Bi³⁺-Yb³⁺-codoped yttrium oxide (Y₂O₃) and various yttrium-aluminum oxides (Y₃Al₅O₁₂, YAlO₃ and Y₄Al₂O₉) has been performed from the point of view of search for materials suitable for enhancement of efficiency of silicon solar cells. The studied materials in the form of nanopowders have been synthesized by sol-gel method and characterized by X-ray powder diffraction, scanning electron microscopy and luminescence techniques. Relative down-conversion efficiency for studied materials has been estimated. It was shown that optimal concentration of Yb³⁺ ions should be 2-4 at.% simultaneously with Bi³⁺ ions in the amount of about 1 at.%. Such dopants content provides the highest emission intensity of Yb³⁺ ions in near-infrared when excited into Bi³⁺ ions absorption in ultraviolet. Perspectives of the studied materials for enhancement of silicon solar cells are discussed.