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Microwave Sol-Gel Derived NaLa(MoO4)2 Yellow Phosphors Doped with Ho3+/Yb3+ and Upconversion Photoluminescence
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 Title & Authors
Microwave Sol-Gel Derived NaLa(MoO4)2 Yellow Phosphors Doped with Ho3+/Yb3+ and Upconversion Photoluminescence
Lim, Chang Sung;
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: phosphors with the correct doping concentrations of and (, and , 0.40, 0.45 and 0.50) were successfully synthesized by the microwave-modified sol-gel method. Well-crystallized particles formed after heat-treatment at for 16 h showed a fine and homogeneous morphology with particle sizes of . The optical properties were examined using photoluminescence emission and Raman spectroscopy. Under excitation at 980 nm, the UC intensities of the doped samples exhibited strong yellow emissions based on the combination of strong emission bands at 545-nm and 655-nm emission bands in green and red spectral regions, respectively. The strong 545-nm emission band in the green region corresponds to the transition in ions, while the strong emission 655-nm band in the red region appears due to the transition in ions. Pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail.
microwave sol-gel;double molybdate;yellow phosphor;upconversion;Raman spectroscopy;
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