Abstract
The upconversion luminescence of several YbEr co-doped Zr-Ba-La-Al-Na(ZBLAN) glass samples (Er(0.5)Yb(3):ZBLAN, Er(0.5)Yb(1):ZBLAN andEr(0.5):ZBLAN) has been studied. A new kind of upconversion cooperativeradiation fluorescence, which comes from coupled cluster states of twoYb3+ ions has been observed. This is significant in that it maylead to a new path to achieve blue upconversion luminescence, which haspromising upconversion applications.
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