MSA  Vol.6 No.7 , July 2015
Observation of Blue-Light Emission Band from Eu-Doped Ta2O5 Thin Films Prepared Using Co-Sputtering
ABSTRACT
In this paper, we report on the first observation of blue-light emission bands from europium-doped tantalum pentoxide (Ta2O5:Eu) thin films prepared using a simple co-sputtering method. We prepared four specimens from one as-deposited sample, and we subsequently annealed them at 700&degC, 800&degC, 900&degC, or 1000&degC for 20 min. Four remarkable photoluminescence (PL) peaks at wavelengths of 600, 620, 650, and 700 nm due to the 5D07F1, 5D07F2, 5D07F3, and 5D07F4 transitions of Eu3+ were observed from all the specimens, and blue PL peaks around a wavelength of 450 nm were also observed from the specimens annealed at 800&degC, 900&degC, and 1000&degC. The blue PL peaks seem to be originated from the 4f65d1→4f7 transition of Eu2+. Both Eu3+ and Eu2+ ions seem to exist in our Ta2O5:Eu co-sputtered thin films annealed at temperatures from 800&degC to 1000&degC. Such Ta2O5:Eu co-sputtered thin films seem to be used as multi-functional coating films having both anti-reflection and down-conversion effects for realizing high-efficiency silicon solar cells.

Cite this paper
Miura, K. , Arai, Y. and Hanaizumi, O. (2015) Observation of Blue-Light Emission Band from Eu-Doped Ta2O5 Thin Films Prepared Using Co-Sputtering. Materials Sciences and Applications, 6, 676-680. doi: 10.4236/msa.2015.67069.
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