Photon down-shifting by energy transfer from Sm3+ to Eu3+ ions in sol-gel SiO2-LaF3 nano-glass-ceramics for photovoltaics |
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| Authors: | J J Velázquez V D Rodríguez A C Yanes J del Castillo J Méndez-Ramos |
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| Institution: | 1. Departamento de F??sica Fundamental y Experimental; Electr??nica y Sistemas, Univ. La Laguna, 38206, La Laguna, Tenerife, Spain
2. Departamento de F??sica B??sica, Univ. La Laguna, 38206, La Laguna, Tenerife, Spain
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| Abstract: | 95SiO2?C5LaF3 sol-gel derived nano-glass-ceramics single doped with Eu3+ or Sm3+ and codoped with both of them were successfully obtained. XRD measurements confirm the precipitation of LaF3 nanocrystals after the ceramming process, with mean size ranging from 10 to 20?nm which increases with the thermal treatment temperature. The incorporation of rare-earth ions into precipitated LaF3 nanocrystals was confirmed from luminescence spectra. Intense yellow-red emissions were detected under UV and blue light excitation in single and codoped samples. The effect of codoping with Eu3+ and Sm3+ ions and the energy transfer mechanism between them have been analyzed in order to increase the yellow-red emissions. |
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