Synthesis and optical properties of novel double perovskite Ca_(2)MgTeO_(6):Dy^(3+),Na^(+) phosphors for white LEDs

查看全文 作　　者：Junzhi [1]Che;Bin [2,3]Deng;Qinyang [1]Song;Jianxu [1]Wang;Tao [1]Wang;Shoucheng [1]Zhao;Ruijin [1,4]Yu

机构地区：[1]College of Chemistry&Pharmacy,Northwest A&F University,Yangling 712100,China;[2]College of Chemistry&Biology and Environmental Engineering,Xiangnan University,Chenzhou 423043,China;[3]Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application,Chenzhou 423043,China;[4]Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials,College of Materials and Chemical Engineering,China Three Gorges University,Yichang 443002,China

出　　处：《Journal of Rare Earths》索引2021年第39卷第6期,共10页

基　　金：Project supported by the Natural Science Foundation of Shaanxi Province(2018JM5055);Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applications(2019XGJSKFJJ01);the Construction Program of the Key Discipline in Hunan Province;the Projects of the Education Department of Hunan Province(18A465);Science and Technology Plan Project of Chenzhou City(jsyf2017014)。 摘　　要：Novel yellow-emitting phosphors of Dy^(3+)-doped double perovskite Ca_(2)MgTeO_(6) were synthesized by using a conventional high-temperature solid-state reaction.The phase purity,particle morphology,size distribution,elemental composition,luminescence properties,and luminescence decay curves of the resulting products were then analyzed in detail.The Ca_(2)MgTeO_(6):Dy^(3+),Na^(+) phosphors show three emission peaks after near-ultraviolet excitation at 350 nm,which correspond to ^(4)F_(9/2)→^(6)H_(11/2),^(4)F_(9/2)→^(6)H_(13/2),and ^(4)F_(9/2)→^(6)H_(13/2) transitions,respectively.Among them,the strongest peak is observed at 573 nm.The best doping content of Dy^(3+)in Ca_(2)MgTeO_(6):xDy^(3+),xNa^(+) phosphors is x=5 mol%.The calculated critical distance of energy transfer between Dy^(3+) ions is 1.6 nm.Luminescence quenching is confirmed to be due to dipole-dipole interactions among Dy^(3+) ions.The phosphors show excellent thermal stability with high activation energy(0.27 eV).The Commission Internationale de l’Eclairage(CIE) chromaticity coordinates of the Ca_(2)MgTeO_(6) Dy^(3+),Na^(+) phosphors are located in the yellow region.White light-emitting diodes(w-LEDs) were fabricated with a high color rendering index(R_(a)) of 88 and a good correlated color temperature(CCT) of 5440 K.All observed properties indicate that Ca_(2)MgTeO_(6):Dy^(3+),Na^(+) phosphors have potential applications in display and photonic devices. 关键词：LUMINESCENCE Double perovskite Ca_(2)MgTeO_(6) PHOSPHOR Rare earths

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Synthesis and optical properties of novel double perovskite Ca_(2)MgTeO_(6):Dy^(3+),Na^(+) phosphors for white LEDs

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