近紫外激发新型荧光粉Li_3Zn_(0.5)SiO_4∶Sm~(3+)的制备及光谱性能
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摘要
用溶胶-凝胶法制备了红橙光荧光粉Li3Zn0.5SiO4∶Sm3+并研究了其发光性能。用X射线衍射、荧光分光光度计对样品进行了表征。结果表明:少量掺杂Sm3+并没有影响Li3Zn0.5SiO4的晶体结构,样品属于正交晶系,空间点群Pmnb(62)。样品的激发光谱主峰位于408nm(6 H5/2→4 L13/2)处。在近紫外408nm的激发下,样品的发射光谱由Sm3+的一系列特征跃迁构成,分别位于566nm(4 G5/2→6 H5/2)、601nm(4 G5/2→6 H7/2)、651nm(4 G5/2→6 H9/2)及710nm(4 G5/2→6 H11/2)。样品在601nm附近表现出良好的红橙光发射。研究了不同Sm3+掺杂量对样品发光性能的影响,随着Sm3+掺杂量增大,样品的发光强度先增大后减小,最佳掺量为3%。
The Li3Zn0.5SiO4∶Sm3+red phosphor was synthesized by a sol-gel method,and its fluorescence properties were studied.The as-synthesized phosphors were characterized by means of X-ray diffraction(XRD),photoluminescence spectra(PL).The results showed that doping of small amounts of Sm3+did not affect the crystal structure of Li3Zn0.5SiO4 with tetragonal crystal system,belonging to the space group of Pmnb(62).The maximum excitation peak of Li3Zn0.5SiO4∶Sm3+is 408nm(6 H5/2→4L13/2).Under ultraviolet excitation with a wavelength of 408 nm,the emission pectra of the sample consisted of characteristic transitions of Sm3+.The emission peaks were located at 566nm(4 G5/2→6 H5/2),601nm(4 G5/2→6 H7/2),651nm(4 G5/2→6 H9/2)and 710nm(4 G5/2→6 H11/2),respectively.The phosphors exhibit a red performance at 601 nm.The effect of the doping amount of Sm3+on the luminescence properties of Li3Zn0.5SiO4∶Sm3+was investigated.When Sm3+doping concentration increased,the luminescence intensity firstly increases and then decreased.The optimal content of Sm3+was about 3%.
The Li3Zn0.5SiO4∶Sm3+red phosphor was synthesized by a sol-gel method,and its fluorescence properties were studied.The as-synthesized phosphors were characterized by means of X-ray diffraction(XRD),photoluminescence spectra(PL).The results showed that doping of small amounts of Sm3+did not affect the crystal structure of Li3Zn0.5SiO4 with tetragonal crystal system,belonging to the space group of Pmnb(62).The maximum excitation peak of Li3Zn0.5SiO4∶Sm3+is 408nm(6 H5/2→4L13/2).Under ultraviolet excitation with a wavelength of 408 nm,the emission pectra of the sample consisted of characteristic transitions of Sm3+.The emission peaks were located at 566nm(4 G5/2→6 H5/2),601nm(4 G5/2→6 H7/2),651nm(4 G5/2→6 H9/2)and 710nm(4 G5/2→6 H11/2),respectively.The phosphors exhibit a red performance at 601 nm.The effect of the doping amount of Sm3+on the luminescence properties of Li3Zn0.5SiO4∶Sm3+was investigated.When Sm3+doping concentration increased,the luminescence intensity firstly increases and then decreased.The optimal content of Sm3+was about 3%.
引文
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[2]Neeraj S,Kijima N,Cheet ham A K.Novel Red Phosphors for Solid-state Lighting:The System NaM(WO4)2-x(MoO4)x∶Eu3+(M=Gd,Y,Bi)[J].Chem Phys Lett,2004,387:2-6.
[3]Setlur A A,Heward W J,Gao Y,et al.Crystal Chemistry and Luminescence of Ce3+Doped Lu2CaMg2(Si,Ge)3O12and Its Use in LED Based Lighting[J].Chem Mater,2006,18(14):3314-3322.
[4]Liao J S,Liu L B,You H Y,et al.Hydrothermal Preparation and Luminescence Property of MWO4∶Sm3+(M=Ca,Sr,Ba)Red Phosphors[J].Opt,2012,123(10):901-905.
[5]Liu L,Yuan X M,Xie A,et al.Synthesis and Luminescent Properties of Eu3+Activated Novel Borate-based Red Emitting Phosphors for White LED[J].J Lumin,2011,32(7):687-692.
[6]杨英,陈永杰,肖林久,等.Sr3B2O6∶Eu3+,Li+荧光粉的合成与发光性能[J].发光学报,2014,35(3):317-321.
[7]张新阳,孙尚前,严端廷,等.12CaO·7Al2O3/5CaO·3Al2O3 Sm3+新型红色荧光粉的制备及发光性质[J].发光学报,2014,35(8):912-915.
[8]Lu Z G,Chen L M,Tang Y G,et al.Preparation and Luminescence Properties of Eu3+-doped MSnO3(M=Ca,Sr and Ba)Perovskite Materials[J].J Alloys Compd,2005,387:L1-L4.
[9]Zhou L Y,Wei J S,Gong F Z,et al.A Potential Red Phosphor ZnMoO4∶Eu3+for Light-emitting Diode Application[J].J Solid Sate Chem,2008,181(6):1337-1341.
[10]宋秀芹,陈汝芬,马建峰.Li2+2xZn1-xSiO4水基溶胶-凝胶法合成及其离子导电性[J].硅酸盐学报,2000,16(1):37-42.
[11]Busuioc C,Jinga S I.Preparation and Characterization of LixZn2-x VxSi1-x O4 Ceramics[J].Ceram Int,2014,40:5931-5936.
[12]宋秀芹,陈汝芬,马建峰.Li3Zn0.5SiO4水基溶胶-凝胶法合成及其离子导电性[J].硅酸盐学报,1999,27(5):605-609.
[13]施伟梅,陈建福,王妙飞,等.燃烧法制备白光LED用红色荧光粉SrBPO5∶Sm3+及发光性能[J].硅酸盐学报,2014,42(3):326-329.
[14]Sunitha D V,Nagabhushana H,Sharma S C,et al.Structural Iono and Thermoluminescence Properties of Heavy Ion(100 MeV Si 7+)Bombarded Zn2SiO4∶Sm3+Nanophosphor[J].J Lumin,2013,143:409-417.
[15]左明扬,杨定明,魏乐.Sm3+掺杂BaCeO3基发光材料的制备及发光性能[J].武汉理工大学学报,2013,35(7):21-25.
[16]Tanimura K,Makimura T,Shibata T,et al.Femtosecond Dynamics of Exciation Relaxation in Alkali Halides[C]//Defects in Insulating Materials 12th International Conference.Singapore:[s.n.],1993:84-98.
[17]石士考,栗俊敏,周济.共沉淀法合成Sm3+掺杂的Sr2CeO4的荧光光谱[J].光谱学与光谱分析,2005,25(10):1739-1741.
[18]Dexter D L,James H S.Theory of Concentration Quenching in Inorganic Phosphors[J].J Chem Phys,1954,22(6):1063-1070.