Li_6(La_2Ca)Nb_2O_(12)基质中掺杂Dy~(3+)离子的发光性质研究
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摘要
采用高温固相法制备了Li_6(La_2Ca)Nb_2O_(12):Dy~(3+)荧光粉样品,通过X射线衍射分析了样品的晶体结构,并利用光谱技术研究了样品的光致荧光光谱.光谱分析结果表明,Li_6(La_2Ca)Nb_2O_(12):Dy~(3+)的激发光谱由两部分组成:一是位于200～290 nm的一个宽带,峰值位于269 nm,属于Nb—O、Dy—O的电荷迁移带的叠加;二是位于310～500 nm之间的系列尖锐的吸收峰,这些激发峰属于Dy~(3+)的f→f跃迁.样品可被近紫外或蓝光LED有效激发.在269 nm激发下,样品在580 nm处有很强的黄光发射,色坐标为(0.470 3,0.492 7).随着Dy~(3+)掺杂浓度的增加,样品的发光强度增强,当Dy~(3+)浓度为10 mol%时出现浓度猝灭.
A novel phosphor Li_6(La_2Ca)Nb_2O_(12):Dy~(3+) was successfully prepared by high temperature solid phase method. The XRD patterns and photoluminescence spectra of the samples were studied by X-ray diffractometer and fluorescence spectrophotometer. Spectral analysis results show that the excitation spectrum of Li_6(La_2Ca)Nb_2O_(12):Dy~(3+) exhibits two parts: one is a broad absorbtion band at 200-290 nm centered at 269 nm, which is assigned the charge transfer band(CTB) of Nb—O and Dy—O; the second is a series of sharp absorption peaks between 310 nm and 500 nm. These excitation peaks belong to the f →f transition of Dy~(3+) ion, which could be excited with the nUV or blue LEDs. Under the excitation of 269 nm, the color coordinates of the emission spectrum are(0.470 3,0.492 7), which is located in the yellow region at 580 nm. The luminescence intensities of the samples increased with the increase of content of Dy~(3+) till x=10 mol%. When the concentration of Dy~(3+) is over 10 mol%, the luminescence intensities decreased due to the concentration quenching mechanism.
A novel phosphor Li_6(La_2Ca)Nb_2O_(12):Dy~(3+) was successfully prepared by high temperature solid phase method. The XRD patterns and photoluminescence spectra of the samples were studied by X-ray diffractometer and fluorescence spectrophotometer. Spectral analysis results show that the excitation spectrum of Li_6(La_2Ca)Nb_2O_(12):Dy~(3+) exhibits two parts: one is a broad absorbtion band at 200-290 nm centered at 269 nm, which is assigned the charge transfer band(CTB) of Nb—O and Dy—O; the second is a series of sharp absorption peaks between 310 nm and 500 nm. These excitation peaks belong to the f →f transition of Dy~(3+) ion, which could be excited with the nUV or blue LEDs. Under the excitation of 269 nm, the color coordinates of the emission spectrum are(0.470 3,0.492 7), which is located in the yellow region at 580 nm. The luminescence intensities of the samples increased with the increase of content of Dy~(3+) till x=10 mol%. When the concentration of Dy~(3+) is over 10 mol%, the luminescence intensities decreased due to the concentration quenching mechanism.
引文
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[2] LI X,GUAN L,SUN M,et al.Luminescent properties of Dy3+ doped SrMoO4 phosphor[J].J Lumin,2011,131(5):1022-1025.
[3] BLASSE G,BRIL A.A new phosphor for flying-spot cathode-ray tubes for color television:yellow-emitting Y3Al5O12:Ce3+[J].Appl Phys Lett,1967,11(2):53-55.
[4] XIA Z G,SUN J F,DU H Y,et al.Luminescence properties of double-perovskite Sr2Ca1-2xEuxNaxMoO6 red-emitting phosphors prepared by the citric acid-assisted solgel method[J].J Mater Sci,2010,45:1553-1559.
[5] YE S,WANG C H,LIU Z S,et al.Photoluminescence and energy transfer of phosphor series Ba2-z SrzCaMo1-yWyO6:Eu3+,Li+ for white light UVLED applications[J].Appl Phys B -Lasers Opt,2008,91:551-557.
[6] CASTELLANOS M,MARTINEZ M C,WEST A R.New family of phases,Li2MXO4:X=Zr,Hf;M=Mg,Mn,Fe,Co,Ni,Cu,Zn with α -LiFeO2 and related structures[J].Z Krist,1990,190:161-169.
[7] BLASSE G.Structure and Bonding 42[M].Berlin:Springer -Verlag Press,1980:25.
[8] XIAO X Z,YAN B.Synthesis and luminescent properties of novel RENbO4:Ln3+(RE=Y,Gd,Lu;Ln=Eu,Tb)[J].J Non-cryst Solids,2005,351(46/48):3634-3639.
[9] 姜永章,夏海平,张加忠,等.单晶体α -NaYF4:Dy3+的制备及光谱特性[J].光子学报,2015,44(8):0816001.
[10] SU Q,PEI Z W,CHI L S,et al.The yellow-to-blue intensity (Y/B) of Dy3+ emission[J].J Alloys Compd,1993,192(1/2):25-27.
[11] SU Q,LIN J,LI B.A study on the luminescence properties of Eu3+ and Dy3+ in M2RE8 (SiO4)6O2(M=Mg,Ca;RE=Y,Gd,La)[J].J Alloys Compd,1995,225(1/2):120-123.
[12] SOMMERDIJK J L,BRIL A.Efficiency of Dy3+-activated phosphors[J].Chem Inform,1975,6(39):1024-1030.
[13] HAN G C,WANG Y H,WU C F,et al.A novel Dy3+-doped GdPO4 white-light phosphors under vacuum ultraviolet excitation for Hg-free lamps application[J].Chin Phys Soc,2009,18(10):4532-4535.
[14] 裴治武,苏锵.Dy3+,Sm3+和Ce3+离子在M3La2(BO3)4 (M=Ca,Sr,Ba)中光谱性质的研究[J].发光学报,1989,10(3):213-218.
[15] PERCIVAL J,APPERLEY D,SLATER P R.Synthesis and structural characterisation of the Li ion conducting garnet-related systems,Li6ALa2Nb2O12(A=Ca,Sr)[J].Solid State Ionics,2008,179:1693-1696.
[16] VENKATARAMAN T,WERNER W.Li6ALa2Nb2O12(A=Ca,Sr,Ba):a new class of fast lithium ion conductors with garnet-like structure[J].J Am Ceram Soc,2005,88(2):411-418.