Photon downshifting in strong NIR emitting Er3+-Yb3+ embedded tungsten tellurite glass
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Er3+/Yb3+ embedded TeO2–WO3 glasses were prepared successfully.

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Strong green and NIR emissions were detected upon excitation with blue photons.

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Huge enhancement in NIR emission was found upon codoping of Yb3+ ions.

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Blue to NIR quantum cutting suitable for solar cell applications was observed.

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