| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1231332 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2013 | 4 Pages |
•Transparent Eu2+–Yb3+ co-doped glass ceramic containing nano-Ca5(PO4)3F was fabricated.•Downconversion luminescence from Eu2+ to Yb3+ was enhanced by precipitating FAP nanocrystals.•Phonon energy of FAP crystal remedy energy gap between Eu2+ to Yb3+.
Eu2+–Yb3+ co-doped transparent glass–ceramic containing nano-Ca5(PO4)3F (FAP) was prepared in reducing atmosphere. XRD and TEM analysis indicated that nano-FAP about 40 nm precipitated homogeneously in glass matrix after heat treatment. Confirmed by spectroscopy measurements, the crystal-like absorption and emission of Eu2+ indicated the partition of Eu2+ into FAP nanocrystals in glass ceramic. NIR emission due to the transition 2F5/2→2F7/2 of Yb3+ ions (about 980–1100 nm) was observed from glasses under ultraviolet excitation, ascribed to downconversion from Eu2+ to Yb3+, which can be enhanced by precipitating nano-FAP crystals. The results indicated that Eu2+–Yb3+ co-doped glass–ceramic embedding with nano-FAP is a promising candidate as downconversion materials for enhancing conversion efficiency of solar cells.
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