Abstract
Optical materials composed of an Y5.7−xHoxYb0.3O5F8 (x = 0.006–0.06) solid solution were prepared through a solid-state reaction using excess NH4F flux at 950 °C for 2 h. X-ray diffraction patterns were obtained from samples of Y5.7−xHoxYb0.3O5F8 prepared using an Y(Ho,Yb)O3/2:NH4F molar ratio of 1:2. The effective up-conversion green emission spectra and dependence of the emission intensity on the pump power (in the range of 77–118 mW) for the Y5.67Ho0.03Yb0.3O5F8 phosphor were investigated during excitation with a diode laser with a wavelength of 980 nm. Temperature-dependent green up-conversion emissions and desired Commission Internationale de l’Eclairage (CIE) values, including emissions from green to yellow wavelength regions, were realized with the phosphors at temperatures from 25 to 175 °C under 980-nm excitation. The green-fluorescence intensity of the Y5.67Ho0.03Yb0.3O5F8 phosphor was considerably enhanced by surface plasmon resonance of Au nanoparticles.
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