Spectrum upconversion and downconversion in (Tm3+, Yb3+) and (Tb3+, Yb3+) co-doped fluorosilicate glass

Z. Pan; R. Akrobetu; S. H. Morgan

doi:10.1117/12.2023077

25 September 2013 Spectrum upconversion and downconversion in (Tm³⁺,Yb³⁺) and (Tb³⁺,Yb³⁺) co-doped fluorosilicate glass

Z. Pan, R. Akrobetu, S. H. Morgan

Proceedings Volume 8824, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV; 88240Z (2013) https://doi.org/10.1117/12.2023077
Event: SPIE Solar Energy + Technology, 2013, San Diego, California, United States

Abstract

We investigated the upconversion and downconversion luminescence in (Tb³⁺, Yb³⁺) and (Tb³⁺, Yb³⁺) co-doped lithiumlanthanum- aluminosilicate oxyfluoride glass. Upon excitation at 980 nm, where crystalline CdTe solar cells no longer absorb, the sub-bandgap photons can be converted to the higher-energy ones via upconversion. In addition, under excitation between 470 nm and 490 nm, one blue photon might be split up to two near-infrared ones via downconversion. The downconversion luminescence matches the spectral response of crystalline Si solar cell well. We observed much more intense upconversion luminescence from (Tm3+, Yb³⁺) codoped glass than that from ( Tb³⁺, Yb³⁺) codoped glass under the same 980 nm excitation conditions. Our results indicate that the sequential energy transfer from Yb³⁺ ions to Tm3+ ions is much more efficient than the cooperative energy transfer from Yb³⁺ ions to Tb³⁺ ions.

Citation Download Citation

Z. Pan, R. Akrobetu, and S. H. Morgan "Spectrum upconversion and downconversion in (Tm³⁺,Yb³⁺) and (Tb³⁺,Yb³⁺) co-doped fluorosilicate glass", Proc. SPIE 8824, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV, 88240Z (25 September 2013); https://doi.org/10.1117/12.2023077

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