The possibility of tuning between red,green and broadband white color of up-conversion was demonstrated in thermally 450 ℃ treated Yb/Er co-doped nano NaYF4 phosphor.The color variability was studied by means of power dependence of luminescence,which exhibited unusual behavior.Large hysteresis,as well as discrepancy from a power law indicated the important role the increased heating played during the up-conversion in nano-sized materials.
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