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Using a CW argon-ion laser operating at 488nm and a pulsed 532nm laser, we find up-conversion of Er 3+ energy in KY 1-x Er x F 4 . Among three samples with x=0.1, 0.05, and x=0.0005 that show energy up-conversion, x=0.1 and 0.05 samples were confirmed to have up-conversion caused by energy transfer. By measuring temporal dependence of the photoluminescence...
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