,BLUE COOPERATIVE UP-CONVERSION LUMINESCENCE OF Yb3+rn IONS IN OXYFLUORIDE GLASS EXCITED BY 960 nm

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Investigates the up-conversion luminescence of Yb-doped oxyfluoride glass excited by a 960nm-diode laser. A new up-conversion cooperative radiation luminescence is found, which is rather strong and positioned at 476.1 nm. It comes from the coupled states of two-Yb3+-ions cluster. It is significant because it is an effective and convenient method of producing blue light.
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