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Title: Role of electron transfer in Ce{sup 3+} sensitized Yb{sup 3+} luminescence in borate glass

In a Ce{sup 3+}-Yb{sup 3+} system, two mechanisms are proposed so far namely, the quantum cutting mechanism and the electron transfer mechanism explaining Yb{sup 3+} infrared luminescence under Ce{sup 3+} excitation. Among them, the quantum cutting mechanism, where one Ce{sup 3+} photon (ultraviolet/blue) gives rise to two Yb{sup 3+} photons (near infrared) is widely sought for because of its huge potential in enhancing the solar cell efficiency. In present study on Ce{sup 3+}-Yb{sup 3+} codoped borate glasses, Ce{sup 3+} sensitized Yb{sup 3+} luminescence at ∼1 μm have been observed on Ce{sup 3+} 5d state excitation. However, the intensity of sensitized Yb{sup 3+} luminescence is found to be very weak compared to the strong quenching occurred in Ce{sup 3+} luminescence in Yb{sup 3+} codoped glasses. Moreover, the absolute luminescence quantum yield also showed a decreasing trend with Yb{sup 3+} codoping in the glasses. The overall behavior of the luminescence properties and the quantum yield is strongly contradicting with the quantum cutting phenomenon. The results are attributed to the energetically favorable electron transfer interactions followed by Ce{sup 3+}-Yb{sup 3+} ⇌ Ce{sup 4+}-Yb{sup 2+} inter-valence charge transfer and successfully explained using the absolute electron binding energies of dopant ions in the studied borate glass.more » Finally, an attempt has been presented to generalize the electron transfer mechanism among opposite oxidation/reduction property dopant ions using the vacuum referred electron binding energy (VRBE) scheme for lanthanide series.« less
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501 (Japan)
  2. (FAME-LMR), 2629 JB Delft (Netherlands)
  3. Delft University of Technology, Faculty of Applied Science, Department of Radiation Science and Technology (FAME-LMR), 2629 JB Delft (Netherlands)
Publication Date:
OSTI Identifier:
22399195
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BINDING ENERGY; BORATES; CERIUM IONS; COMPARATIVE EVALUATIONS; ELECTRON TRANSFER; ELECTRONS; GLASS; LUMINESCENCE; OXIDATION; PHOTONS; QUANTUM EFFICIENCY; RARE EARTHS; REDUCTION; SOLAR CELLS; ULTRAVIOLET RADIATION; VALENCE; YTTERBIUM IONS