Sensitized Yb3+ Luminescence of Eu3+/Yb3+-Codoped Fluorosilicate Glass Ceramics


  • This work was financially supported by the National Nature Science Foundation of China (No. 50902120), the Research Fund of the Doctoral Program of Higher Education of China (No. 20100101120025), Science and Technology Innovative Research Team of Zhejiang Province (No. 2009 R50010) and Program for Changjiang Scholars and Innovative Research Team in University.

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Intense infrared emission of Yb3+ is reported for the Eu3+/Yb3+ co-doped fluorosilicate glass ceramics. With annealing methods, cubic SrF2:Eu3+, Yb3+ nanocrystals are precipitated homogeneously in the glass ceramics. The incorporation of Eu3+ and Yb3+ in the SrF2 nanocrystal was confirmed by XRD patterns and emission spectra. Deriving from much closer distance between Eu3+ and Yb3+ ions in the nanocrystals, higher efficient energy transfer of Eu3+Yb3+ (cross relaxation between Eu3+:5D07F6 andYb3+:2F5/22F7/2 transition or cooperative energy transfer from one Eu3+ ion to a couple of Yb3+ ions) and intense near infrared emission of Yb3+:2F5/22F7/2 transition are achieved in the glass ceramics. Both the quantum yield (QY) and the NIR emission intensity of the glass ceramics are enhanced, when compared with the precursor glasses. The maximum ET efficiency of Eu3+Yb3+ is close to 60%, and the measured maximum QY of 980 nm emissions is 13%. It demonstrates the potential application of Eu3+/Yb3+ co-doped glass ceramics in improving the efficiency of silicon solar cells.