近紫外激发Ca_2NaMg_2V_3O_(12):Sm~(3+)荧光粉的制备及发光性能
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摘要
近紫外激发单一基质白光发射荧光粉是当前LED用荧光转换材料的研究热点。采用高温固相反应制备了Ca_2NaMg_2V_3O_(12):Sm~(3+)荧光粉,并利用X射线粉末衍射仪和荧光光谱仪等测试手段,对其物质结构和荧光性能进行了表征。探讨了(VO_4)~(3-)基团的发光机理,及其与Sm3+离子之间的能量传递机制。结果表明:Ca_2NaMg_2V_3O_(12):Sm~(3+)荧光粉属于立方相晶体结构。在340 nm紫外线激发下,样品发射蓝绿光,发射最强峰位于500 nm,发射光谱覆盖整个可见光区。Sm~(3+)离子的最佳掺杂浓度为0. 03,同时(VO_4)~(3-)基团与Sm~(3+)离子之间的能量传递主要是通过电四偶极-电四偶极相互作用来实现的。
Single phase white light emission phosphors excited by near ultraviolet light is the research focus of luminescent conversion materials. The Ca_2NaMg_2V_3O_(12):Sm~(3+) phosphors were prepared by the high temperature solid phase reaction and their crystal structure and fluorescence properties were characterized by the X-ray powder diffraction and fluorescence spectrometer. The luminescence mechanism of the( VO_4)~(3-) groups and the energy transfer mechanism between(VO_4)~(3-) groups and Sm~(3+) ions were discussed. The results show that the Ca_2NaMg_2V_3O_(12):Sm~(3+) phosphors belong to cubic crystal structure. Under the the excitation of the wavelength of 340 nm,the samples display blue-green emission with a strongest emission peak at 500 nm. The emission spectrum covers the whole visible light region. The optimized doping concentration for Sm~(3+) ions is 0. 03. Meanwhile,the energy transfer between( VO_4)~(3-) groups and Sm~(3+) ions is realized by electric quadrupolequadrupole(q-q) interactions.
Single phase white light emission phosphors excited by near ultraviolet light is the research focus of luminescent conversion materials. The Ca_2NaMg_2V_3O_(12):Sm~(3+) phosphors were prepared by the high temperature solid phase reaction and their crystal structure and fluorescence properties were characterized by the X-ray powder diffraction and fluorescence spectrometer. The luminescence mechanism of the( VO_4)~(3-) groups and the energy transfer mechanism between(VO_4)~(3-) groups and Sm~(3+) ions were discussed. The results show that the Ca_2NaMg_2V_3O_(12):Sm~(3+) phosphors belong to cubic crystal structure. Under the the excitation of the wavelength of 340 nm,the samples display blue-green emission with a strongest emission peak at 500 nm. The emission spectrum covers the whole visible light region. The optimized doping concentration for Sm~(3+) ions is 0. 03. Meanwhile,the energy transfer between( VO_4)~(3-) groups and Sm~(3+) ions is realized by electric quadrupolequadrupole(q-q) interactions.
引文
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[4]Li G,Tian Y,Zhao Y,et al.Recent Progress in Luminescence Tuning of Ce3+and Eu2+-Activated Phosphors for PC-WLEDs[J].Chem.Soc.Rev.,2015,44:8688-8713.
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[6]Shang M M,Li C,Lin J.How to Produce White Light in A Single-Phase Host[J].Chem.Soc.Rev.,2014,45:1372-1386.
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[9]Nakajima T,Isobe M,Tsuchiya T,et al.Direct Fabrication of Metavanadate Phosphor Films on Organic Substrates for White-Light-Emitting Devices[J].Nat.Mater.,2008,7:735-740.
[10]Dang P,Liang S,Li G,et al.Full Color Luminescence Tuning in Bi3+/Eu3+-doped Li Ca3Mg V3O12Garnet Phosphors Based on Local Lattice Distortion and Multiple Energy Transfers[J].Inorg.Chem.,2018,57:9251-9259.
[11]Huang X,Guo H.A Novel Highly Efficient Single-Composition Tunable White-Light-Emitting Li Ca3Mg V3O12∶Eu3+Phosphor[J].Dyes Pigments.,2018,154:82-86.
[12]Hasegawa T,Abe Y,Koizumi A.et al.Bluish-White Luminescence in Rare-Earth-Free Vanadate Garnet Phosphors:Structural Characterization of Li Ca3MV3O12(M=Zn and Mg)[J].Inorg.Chem.,2017,57:857-866.
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