Physicochemical properties of Li3Ba2La3(MoO4)8:Eu,Tb red-emitting phosphor for solid state white lamps |
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| Affiliation: | 1. Center for Scientific Research and Higher Education of Ensenada Ensenada, Baja California 22860, Mexico;2. Center for Nanoscience and Nanotechnology, National Autonomous University of México Ensenada, Baja California 22860, Mexico;1. Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, China;2. Qilu University of Technology (Shandong Academy of Sciences), Advanced Materials Institute, Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials, Jinan, 250014, China;1. Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, PR China;2. Heilongjiang College of Business and Technology, Harbin, 150025, PR China;3. Suihua University, Suihua, 152000, PR China;1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China;2. Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;3. Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, China;4. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;5. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;1. Research Institute of Photonics, Dalian Polytechnic University, Dalian, 116034, China;2. Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University, Taiyuan, 030001, China;1. School of Chemistry and Chemical Engineering, Xi''an University of Architecture and Technology, Xi''an, 710055, China;2. Collaborative Innovation Center of Rare-Earth Optical Functional Materials and Devices Development, School of Physics and Opto-Electronic Technology, Baoji University of Arts and Sciences, Baoji, 721016, China;1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819, China;2. Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan;3. Foshan Graduate School of Northeastern University, Foshan, Guangdong, 528311, China |
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| Abstract: | In this work, combustion synthesis was used for the first time to fabricate a phosphor material with red emission for applications in solid-state white-light lamps. We synthesized a material with emission wavelength at λem = 617 nm, excited under long UV-blue wavelength based on Eu3+, Tb3+-activated molybdates Li3Ba2(La1–x–yEuxTby)3(MoO4)8 with 0 ≤ x ≤ 1 and 0 ≤ y ≤ 1. A series of powder samples were produced by the combustion method and post-annealed at 800 °C in air. The crystalline phase formation was investigated by X-ray diffraction, which reveals the monoclinic C2/c (15) space group. It is observed that crystalline structure and morphology are preserved when the host lattice is doped with Eu3+ or Tb3+ single ions and co-doped with both ions at different doping concentrations. A detailed characterization by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) shows a similar morphology in all samples: rather large (1–7 μm) agglomerate particles with irregular shapes and surrounded by smaller nanoparticles of 50 nm in size. UV–visible absorption spectra confirm the presence of Eu3+ and Tb3+ ions. The luminescent properties of the obtained phosphors were studied in detail. Cathodoluminescence measurements indicate that the best emission intensity is for Eu3+:Tb3+ doping ratios of 80:0, 90:0 and 20:80. On the other hand, samples with 80:0, 60:40, and 20:80 doping ratios show the highest intensity in a detailed photoluminescence analysis and they exhibit the highest quantum yield values. A complete and efficient energy transfer from the sensitizer Tb3+ to the activator Eu3+ is observed in all co-doped phosphors post-annealed at 800 °C for 4 h. Thus, the Li3Ba2La3(MoO4)8:Eu3+,Tb3+ materials fabricated by combustion synthesis are excellent phosphors for being applied as red-emitting component in solid-state white-light lamps due to an improved color rendering index (CRI) that can be obtained under long UV-blue excitation wavelengths. |
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| Keywords: | Molybdate Europium Terbium Luminescence Phosphor-converted LED Rare earths |
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