Broadband Absorption and Near-Infrared Quantum Cutting in Ce3 +–Tb3 +–Yb3 + Co-Doped Y4Si2O7N2 Phosphor via Energy Transfer
In this work, Ce3+–Tb3+–Yb3+ co-doped Y4Si2O7N2 phosphor has been prepared, and the luminescence properties have been investigated. Broadband absorption can be realized by the Ce3+ ions in the oxynitride host Y4Si2O7N2, and the Ce3+–Tb3+–Yb3+ ions coupled via the energy transfer can cut one photon in the ultraviolet (UV) or visible region into two near-infrared (NIR) region photons, showing potential in modifying the spectral absorption of the Si-based solar cell. The luminescence spectra in both visible and NIR regions and the luminescence decay curves of Tb3+ were recorded to provide direct evidence of energy transfer from Ce3+ to Tb3+ ions, and the subsequent quantum cutting luminescence originated from Tb3+ to Yb3+. The present results give insight into strategies involved in the broad-band absorption based on the Ce3+–Tb3+–Yb3+ couple and the suitable oxynitride host system.
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Document Type: Research Article
Publication date: December 1, 2014
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