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Synthesis and photoluminescence properties of CaGd2(MoO4)4:Eu3+ red phosphors
Affiliation:1. Department of LED convergence Engineering, Pukyong National University, Busan 48513, Republic of Korea;2. Cooperative Laboratory Center, Pukyong National University, Busan 48513, Republic of Korea;1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;2. Institute of Advanced Material, Nanjing University of Technology, Nanjing 210009, China;1. School of Materials Science and Technology, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences, Beijing 100083, China;2. Laboratory of Crystal Physics, Institute of Physics, SB RAS, Krasnoyarsk 660036, Russia;3. Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia;1. Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Material Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, Hubei, China;2. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, Hubei, China
Abstract:The novel red-emitting Eu3+ ions activated CaGd2(MoO4)4 phosphors were prepared by a citrate sol–gel method. The X-ray diffraction patterns confirmed their tetragonal structure when the samples were annealed above 600 °C. The photoluminescence excitation spectra of CaGd2(MoO4)4:Eu3+ phosphors exhibited the charge transfer band (CTB) and intense f–f transitions of Eu3+ ion. The optimized annealing temperature and Eu3+ ion concentration were analyzed for CaGd2(MoO4)4:Eu3+ phosphors based on the dominant red (5D07F2) emission intensity under NUV (394 nm) excitation. All decay curves were well fitted by the single exponential function. These luminescent powders are expected to find potential applications such as WLEDs and optical display systems.
Keywords:A  Sol–gel processes  C  Lifetime  C  Optical properties
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