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Without introducing concentration quenching phenomenon, a few wt.% of Tb 3+ and Yb 3+ ions were doped into a group of easily-fiberized tellurite glasses characterized by loose polyhedron structures and rich interstitial positions. Intense green upconversion emission from Tb 3+ ions centered at 539nm due to transition 5 D 4 → 7 F 5 was observed...
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