12CaO·7Al_2O_3∶Ce~(3+)透明陶瓷的制备及其闪烁特性研究
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摘要
采用高温固相法制备了不同Ce3+掺杂浓度的12Ca O·7Al2O3(C12A7∶x%Ce3+)陶瓷样品。在350 nm紫外光激发下,样品的发射光谱呈现为主峰位于440 nm的宽带,来源于Ce3+的5d1→2F5/2和2F7/2的辐射跃迁。随着Ce3+掺杂浓度的增加,发射强度增大;当Ce3+摩尔分数超过0.7%时,有杂质相出现。为了进一步提高光致发光强度,采用自蔓延燃烧法合成了C12A7∶0.5%Ce3+陶瓷样品。在H2气氛下热处理,通过改变笼中阴离子基团的种类和数目提高了陶瓷闪烁特性(发光强度和衰减时间)。结果表明,C12A7∶Ce3+陶瓷是可应用于闪烁体的潜在材料。
12Ca O·7Al2O3∶ Ce3 +( C12A7∶ x% Ce3 +) transparent ceramics were synthesized by a solid state method. Upon 350 nm UV excitation,a broad emission band located around 440 nm can be observed and it can be attributed to the transitions from 5d1to2F5 /2and2F7 /2of Ce3 +,respectively. It can be seen that the emitting intensity increases with the increasing of Ce3 +doping concentration. When the mole fraction of Ce3 +exceeds 0. 7%,other impurities appear. To enhance the emitting intensity,C12A7∶ 0. 5% Ce3 +transparent ceramics were prepared by a self-propagating combustion method. For the samples annealed in H2 ambient,the scintillation properties,such as the emitting intensity and decay time,are improved by controlling sorts and amounts of encaged anions in C12A7.The experiment results show that Ce3 +doped C12A7 might be a potential scintillation material.
12Ca O·7Al2O3∶ Ce3 +( C12A7∶ x% Ce3 +) transparent ceramics were synthesized by a solid state method. Upon 350 nm UV excitation,a broad emission band located around 440 nm can be observed and it can be attributed to the transitions from 5d1to2F5 /2and2F7 /2of Ce3 +,respectively. It can be seen that the emitting intensity increases with the increasing of Ce3 +doping concentration. When the mole fraction of Ce3 +exceeds 0. 7%,other impurities appear. To enhance the emitting intensity,C12A7∶ 0. 5% Ce3 +transparent ceramics were prepared by a self-propagating combustion method. For the samples annealed in H2 ambient,the scintillation properties,such as the emitting intensity and decay time,are improved by controlling sorts and amounts of encaged anions in C12A7.The experiment results show that Ce3 +doped C12A7 might be a potential scintillation material.
引文
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[2]Sakthong O,Chewpraditkul W,Wanarak C,et al.Scintillation properties of Gd3Al2Ga3O12∶Ce3+single crystal scintillators[J].Nucl.Instrum.Methods Phys.Res.A,2014,751:1-5.
[3]Wei Q,Liu G,Zhou Z,et al.Preparation and spectroscopic properties of Ce-doped La2Si2O7as novel scintillator materials[J].Mater.Lett.,2014,126:178-180.
[4]Yanagida T,Fujimoto Y,Watanabe K,et al.Scintillation and optical stimulated luminescence of Ce-doped Ca F2[J].Rad.Meas.,2014,71:162-165.
[5]Chen Q W,Shi Y,Shi J L.The latest progress in ceramic scintillators research[J].Mater.Sci.Eng.(材料科学工程),2005,23(1):128-132(in Chinese).
[6]Drozdowski W,Wojtowicz A J,ukasiewicz T,et al.Scintillation properties of Lu AP and Lu YAP crystals activated with cerium and molybdenum[J].Nucl.Instrum.Methods Phys.Res.A,2006,562(1):254-261.
[7]Fan L,Shi Y,Xu J,et al.Consolidation of translucent Ce3+-doped Lu2Si O5scintillation ceramics by pressureless sintering[J].J.Mater.Res.,2014,29(19):2252-2259.
[8]Hu C,Liu S P,Fasoli M,et al.ESR and TSL study of hole and electron traps in Lu AG∶Ce,Mg ceramic scintillator[J].Opt.Mater.,2015,45:252-257.
[9]Kamada K,Nikl M,Kurosawa S,et al.Co-doping effects on luminescence and scintillation properties of Ce doped Lu3Al5O12scintillator[J].Nucl.Instrum.Methods Phys.Res.A,2015,782:9-12.
[10]Liu Y X,Ma L,Yan D T,et al.Effects of encaged anions on the optical and EPR spectroscopies of RE doped C12A7[J].J.Lumin.,2014,152:28-32.
[11]Bian H Y,Liu Y X,Yan D T,et al.Spectral modulation through controlling anions in nanocaged phosphors[J].J.Mater.Chem.C,2013,1(47):7896-7903.
[12]Liu X L,Liu Y X,Yan D T,et al.A multiphase strategy for realizing green cathodoluminescence in 12Ca O·Al2O3-Ca Ce Al3O7∶Ce3+,Tb3+conductive phosphor[J].Dalton Trans.,2013,42(46):16311-16317.
[13]Liu X L,Liu Y X,Yan D T,et al.Single-phased white-emitting 12Ca O·7Al2O3∶Ce3+,Dy3+phosphors with suitable electrical conductivity for field emission displays[J].J.Mater.Chem.,2012,22(33):16839-16843.
[14]Li L,Liang H B,Tian Z F,et al.Luminescence of Ce3+in different lattice sites of La2Ca B10O19[J].J.Phys.Chem.C,2008,112:13763-13768.
[15]Xu J,Fan L,Shi Y,et al.Effects of Ce3+doping concentrations on microstructure and luminescent properties of Ce3+∶Lu3Al5O12(Ce∶Lu AG)transparent ceramics[J].Opt.Mater.,2014,36(12):1954-1958.
[16]Liang H B,Tian Z F,Zhong J P,et al.Luminescence of Ce3+activated(fluoro-)phosphates under VUV-UV and X-ray excitation[J].Chin.J.Lumin.(发光学报),2011,32(5):411-416(in Chinese).
[17]Qu G Y,Dong N,Guo H,et al.Synthesis and spectroscopic properties of MBPO5Ce3+(M=Ca,Sr,Ba)[J].Chin.J.Lumin.(发光学报),2005,26(2):199-204(in Chinese).
[18]Gong L,Lin Z,Ning S,et al.Synthesis and characteristics of the C12A7-O-nanoparticles by citric acid sol-gel combustion method[J].Mater.Lett.,2010,64(11):1322-1324.
[19]Jia D,Jia W,Wang X J,et al.Quenching of thermo-stimulated photo-ionization by energy transfer in Ca Al4O7∶Tb3+,Ce3+[J].Solid State Commun.,2004,129(1):1-4.
[20]Tldsepp E,Avarmaa T,Denks V,et al.Synthesis and luminescence properties of Ce3+doped nanoporous 12Ca O·7Al2O3powders and ceramics[J].Opt.Mater.,2010,32(8):784-788.
[21]Hayashi K,Kamiya T,Hirano M,et al.Light-induced conversion of an insulating refractory oxide into a persistent electronic conductor[J].Nature,2002,419:462-465.
[22]Sushko P V,Shluger A L,Hirano M,et al.From insulator to electride:A theoretical model of nanoporous oxide 12Ca O·7Al2O3[J].JACS,2006,129:942-951.
[23]Su Q.Rare Earth Chemistry[M].Zhengzhou:Henan Science and Technology Press,1993:285-288(in Chinese).
[24]Sun J Y,Du H Y.Luminescent Material[M].Beijing:Chemical Industry Press,2003:97-99(in Chinese).