Journal
MATERIALS LETTERS
Volume 249, Issue -, Pages 9-12Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2019.03.046
Keywords
Downconversion; Phosphors; Luminescence; Si-solar cells; Energy transfer
Funding
- Naval Research Board (NRB/DRDO), India [DNRD/05/4003/NRB/297]
- Hindustan University through CENCON
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We report a new V activated ZnO host co-doped with Yb3+ and Eu3+ downconversion (DC) phosphor to convert the UV photons to near Infra-red (NIR) photons. The absorption efficiency of the ZnO host with activator Yb3+ is found to get significantly enhanced with V doping. The NIR emission at 980 nm of Yb3+ is enhanced at an optimal concentration of 3 mol% V in ZnO host (ZV). Further, with an additional sensitizer Eu3+, enhanced NIR emission is observed at 980 nm for the corresponding excitation of Eu3+. The mechanisms for the energy transfer from the host (ZV) and sensitizer (Eu3+) to the activator (Yb3+) are discussed in detail. This enables ZV: Eu3+, Yb3+ as an efficient DC phosphor which could enhance the spectral response of Si-solar cells in the UV range. (C) 2019 Elsevier B.V. All rights reserved.
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