Article ID Journal Published Year Pages File Type
1494044 Optical Materials 2014 4 Pages PDF
Abstract

•Highly efficient Bi3+ excitation and Yb3+ NIR emission was demonstrated in oxyfluoride glass.•Bi3+/Yb3+ dual ion high efficient quantum cutting was observed.•The cooperative energy transfer process from Bi3+ to Yb3+ was discussed.•The proposed glasses will favor the development of the crystalline Si solar cells.

The Bi3+/Yb3+ ion co-doped 55SiO2–20Al2O3–5Na2CO3–20CaF2 glasses are synthesized successfully by a conventional melting-quenching method. High efficient quantum cutting involving the emission of two near-infrared photons for one ultraviolet photon absorbed is realized in the oxyfluoride glasses co-doped with Bi3+ and Yb3+. An intense characteristic near-infrared emission around 977 nm of Yb3+:2F5/2 → 2F7/2 transition is obtained when the 303 nm is as excitation wavelength to induce the 1S0 → 3P1 transition of Bi3+. The maximum quantum efficiency of our glasses is estimated to be 164.3%. The energy transfer mechanism is proposed to be a cooperative energy transfer via second-order down-conversion process. The glasses could be a potential quantum cutting converter to improve the photovoltaic energy conversion efficiency of crystalline Si solar cells via spectrum modification.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
Authors
, , , , ,