Abstract

A synergistic effect between UV down-conversion and IR up-conversion is witnessed in ${\mathrm{YbF}}_3\text{:}{\mathrm{Er}}^{3+}$ phosphors by employing the dual wavelength ($369\mathrm{nm}$ and $980\mathrm{nm}$) excitation source. The synergistic effect originates from an abnormal energy transfer between ${\mathrm{Er}}^{3+}$ ions, in which the ${\mathrm{Er}}^{3+}$ ions in metastable states excited by $369\mathrm{nm}$ photons are excited again by the $980\mathrm{nm}$ IR photons. The dual wavelength excited red emission intensity is 1.1 times the total red emission intensities from $369\mathrm{nm}$ and $980\mathrm{nm}$ single excitation. The synergistic effect refers us to a way to convert both high-energy and low-energy photons into one middle-energy photon with high quantum yield.

© 2011 Optical Society of America

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