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We present the optical up-conversion (UC) study for Yb3 + –Ho3 + co-doped Na(Y1·5Na0·5)F6 nanorods synthesized by employing a facile hydrothermal method. Numbers of Ho3 + ion up-conversion emissions have been observed under 980 nm infrared diode laser excitation. Three UC emissions of interest, ultraviolet, violet and blue, are specially identified at 359, 387, 418 and 483 nm, corresponding to ...
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