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  • Near-infrared luminescence from Y2O3:Eu3+, Yb3+ prepared by sol-gel method.

Near-infrared luminescence from Y2O3:Eu3+, Yb3+ prepared by sol-gel method.

Journal of nanoscience and nanotechnology (2014-04-18)
Ying Xie, Lin J Xiao, Feng Q Yan, Yong J Chen, Wen Z Li, Xiu J Geng
ABSTRACT

Eu3+ and Yb3+ codoped Y2O3 phosphors were synthesized by the sol-gel method. The phosphors possess absorption in the region of 300-550 nm, exhibiting an intense NIR emission of Yb3+ around 1000 nm, which is suitable for matching the maximum spectral response of c-Si solar cells. The optimum composition of Eu3+ and Yb3+ codoped Y2O3 was (Y1.94Yb0.04Eu0.02)2O3. It is observed that two-step energy transfer occurs from the 5D2 level of Eu3+ situated around (466 nm) exciting two neighboring Yb3+ ions to the 2F5/2 level (1000 nm). The down-conversion material based on Eu(3+)- Yb3+ couple may have great potential applications in c-Si solar cells to enhance their photovoltaic conversion efficiency via spectral modification.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Yttrium, chips, 99.9% trace rare earth metals basis
Sigma-Aldrich
Ytterbium, powder, ≥99.9% trace rare earth metals basis
Sigma-Aldrich
Yttrium sputtering target, diam. × thickness 2.00 in. × 0.25 in., 99.9% trace metals basis