SiO 2 -TiO 2 doped with Er 3+ /Yb 3+ /Eu 3+ photoluminescent material: A spectroscopy and structural study about potential application for improvement of the efficiency on solar cells
SiO 2 -TiO 2 doped with Er 3+ /Yb 3+ /Eu 3+ photoluminescent material: A spectroscopy and structural study about potential application for improvement of the efficiency on solar cells
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