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The different concentration of Tb3+/Yb3+ co-doped tellurite glasses were prepared by high-temperature melting–quenching method. The near-infrared (NIR) luminescence of co-doped samples upon the excitation of Tb3+ ions with a green visible photon at 484nm was investigated, and two NIR photons could be emitted by Yb3+ (2F5/2→2F7/2) through cooperative energy transfer from Tb3+ to two Yb3+ ions. On the...
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