Near-infrared down-conversion in rare-earth-doped chloro-sulfide glass GeS{sub 2}-Ga{sub 2}S{sub 3}-CsCl: Er, Yb
Journal Article
·
· Journal of Applied Physics
- Equipe Verres et Ceramiques, UMR CNRS 6226 Sciences Chimiques de Rennes, Universite de Rennes 1, Campus de Beaulieu, Rennes 35042 (France)
- Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)
Chloro-sulfide glass with low phonon energy, GeS{sub 2}-Ga{sub 2}S{sub 3}-CsCl, is co-doped with Er and Yb. This active glass is a potential downconversion material for modifying the solar spectrum to improve the efficiency of solar cells. Two downconversion processes from visible to near infrared are observed. In the first process, an energy transfer between Er{sup 3+} ions and Yb{sup 3+} ions occurs. In that case, one photon is absorbed by the {sup 4}I{sub 15/2}{yields}{sup 2}H{sub 11/2} (Er{sup 3+}) transition and then two photons are emitted by {sup 2}F{sub 5/2}{yields}{sup 2}F{sub 7/2} (Yb{sup 3+}) and {sup 4}I{sub 13/2}{yields}{sup 4}I{sub 15/2} (Er{sup 3+}), respectively. In the second process, downconversion takes place from the charge-transfer state of Yb{sup 3+}-S{sup 2-} to the 4f states of Yb{sup 3+} ions, which leads to an intense excitation band between 400 nm and 600 nm, and an emission at 1000 nm. Quantum yields for downconversion are measured. The highest quantum yields of emission below 1200 nm and 1650 nm are equal to 51% and 76%, respectively.
- OSTI ID:
- 22036779
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 110; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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