Microwave sol-gel process of KGd(WO4)2:Ho3+/Yb3 phosphors and their upconversion photoluminescence properties |
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| Affiliation: | 1. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;2. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Micro-system and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;1. Department of Physics, POSTECH, Pohang, South Korea;2. Pohang Accelerator Laboratory, POSTECH, Pohang, South Korea;3. Advanced Materials Research Lab, Department of Basic & Applied Sciences, Punjabi University, Patiala, Punjab, India;1. Department of Physics, ML Sukhadia University, Udaipur 313001, India;2. Department of Physics, College of Science, University of Tikrit, Tikrit, Iraq;3. Department of Physics, College of Education, University of Tikrit, Tikrit, Iraq;4. Department of Physics, Manipal University Jaipur, Jaipur 303007, India;5. Department of Pure and Applied Physics, University of Kota, Kota 324010, India;1. Physical and Life Sciences, Lawrence Livermore National Laboratory, PO Box 808, L-372, Livermore, CA 94551, United States;2. Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States |
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| Abstract: | ![]()
Double tungstate KGd1−x(WO4)2:Ho3+/Yb3+ phosphors with doping concentrations of Ho3+ and Yb3+ (x=Ho3++Yb3+, Ho3+=0.05, 0.1, 0.2 and Yb3+=0.2, 0.45) were successfully synthesized by the microwave sol–gel method, and the upconversion mechanisms were investigated in detail. The synthesized particles formed after heat-treatment at 900 °C for 16 h showed a well crystallized morphology with particle sizes of 2–5 μm. Under excitation at 980 nm, the UC intensities of KGd0.7(WO4)2:Ho0.1Yb0.2 and KGd0.5(WO4)2Ho0.05Yb0.45 particles exhibited yellow emissions based on a strong 550-nm emission band in the green region and a strong 655-nm emission band in the red region, which were assigned to the 5S2/5F4→5I8 and 5F5→5I8 transitions, respectively. The Raman spectra of the doped particles indicated the presence of strong peaks at higher frequencies of 764, 812, 904, 984, 1050, 1106, 1250 and 1340 cm−1 induced by the disorder of the [WO4]2− groups with the incorporation of the Ho3+ and Yb3+ elements into the crystal lattice or by a new phase formation. |
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| Keywords: | A. Optical materials B. Sol–gel growth C. X-ray diffraction C. Raman spectroscopy Luminescence |
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