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The paper presents the spectroscopic investigation of Pr 3+ ,Yb 3+ :BaY 2 F 8 and the characteristics of the upconverted emission from the 3 P 0 level due to an avalanche mechanism under infrared excitation around 820 and 870 nm. Absorption and emission measurements at 12 K were performed in order to refine the Stark level scheme. Room temperature...
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