Temperature and plasmon dependent Y6O5F8:Ho3+, Yb3+ up-conversion phosphors
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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.
We acknowledge financial supports from the Korea Foundation for the Advancement of Science & Creativity (KOFAC) funded by the Korean Government (MOE, Project No. Sbj000025149) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2018R1D1A3B07048543). This work was supported by the BB21 + Project in 2018.
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