水热法制备Y_2O_2S∶Dy~(3+),Mg~(2+),Ti~(4+)白色长余辉微纳米材料及发光性能
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摘要
采用水热法制备了白色长余辉微纳米发光材料Y2O2S∶x Dy3+,Mg2+,Ti4+(x=0.5%,1.0%,1.5%,2.0%,2.5%),利用X射线粉末衍射(XRD)、扫描电镜(SEM)、激发和发射光谱、色度坐标、余辉曲线和热释光谱对样品进行表征。结果表明:煅烧后,样品的形貌为颗粒状,其粒径在150~250 nm之间;在359 nm的紫外光激发下,样品在488 nm和579 nm处有两个很强的发射峰,它们分别对应于Dy3+的蓝色跃迁(4F9/2→6H15/2)和黄色跃迁(4F9/2→6H13/2),适当比例的黄光和蓝光混合可以产生白光;当Dy3+浓度为2.0%(摩尔分数)时,样品的余辉性能最佳,用254 nm的低压汞灯照射10 min后,余辉时间可达到3600 s(≥1 mcd/m2)以上,与同样温度下高温固相法或溶胶凝胶法所制备样品的相比,其余辉性能得到了很大改善。
White-luminescent materials with long afterglow Y2O2 S ∶ x Dy3 +,Mg2 +,Ti4 +( x = 0. 5%,1.0%,1. 5%,2. 0%,2. 5%) were synthesized at low temperature via the hydrothermal method. The samples were characterized by the powder X-ray diffraction( XRD),scanning electron microscopy( SEM),photoluminescence( PL),afterglow decay curves and the thermoluminescence( TL) curves. The results show that the morphology of samples are granular and the diameter of particles are about 150-250 nm. Under 359 nm UV excitation,there are two sharp emission peaks at 488 nm and 579 nm which corresponded to the transitions from4F9 /2to6H15 /2level and4F9 /2to6H13 /2level of Dy3 +,respectively,according to the suitable control of the blue and yellow intensity ratio,the white-light can be obtained;when the concentration of Dy3 +reached 2. 0%,the sample show the optimal initial luminance and afterglow time,the decay time could last for over 3600 s( ≥1 mcd / m2) after irradiation with 254 nm UV( Ultraviolet) radiation for 10 min. The luminescent performance of the sample is better than whichobtained by the solid state or sol-gel method at the same temperature.
White-luminescent materials with long afterglow Y2O2 S ∶ x Dy3 +,Mg2 +,Ti4 +( x = 0. 5%,1.0%,1. 5%,2. 0%,2. 5%) were synthesized at low temperature via the hydrothermal method. The samples were characterized by the powder X-ray diffraction( XRD),scanning electron microscopy( SEM),photoluminescence( PL),afterglow decay curves and the thermoluminescence( TL) curves. The results show that the morphology of samples are granular and the diameter of particles are about 150-250 nm. Under 359 nm UV excitation,there are two sharp emission peaks at 488 nm and 579 nm which corresponded to the transitions from4F9 /2to6H15 /2level and4F9 /2to6H13 /2level of Dy3 +,respectively,according to the suitable control of the blue and yellow intensity ratio,the white-light can be obtained;when the concentration of Dy3 +reached 2. 0%,the sample show the optimal initial luminance and afterglow time,the decay time could last for over 3600 s( ≥1 mcd / m2) after irradiation with 254 nm UV( Ultraviolet) radiation for 10 min. The luminescent performance of the sample is better than whichobtained by the solid state or sol-gel method at the same temperature.
引文
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[2]崔彩娥,田艳红,黄平,等.烧结温度对红色长余辉发光材料Ca0.8Zn0.2Ti O3∶Pr3+,Na+性能的影响[J].人工晶体学报,2011,40(4):958-962.Cui C E,Tian Y H,Huang P,et al.Effect of Sintering Temperature on Properties of Red Long Afterglow Phosphor Ca0.8Zn0.2Ti O3∶Pr3+,Na+[J].Journal of Synthetic Crystals,2011,40(4):958-962(in Chinese).
[3]阳区,刘应亮,沙磊,等.燃烧法表面处理的Sr Al2O4∶Eu2+,Dy3+长余辉发光材料[J].发光学报,2011,32(9):864-868.Yang Q,Liu Y L,Sha L,Yu C X,et al.Surface Treatment of Sr Al2O4∶Eu2+,Dy3+Phosphors by Combustion Method[J].Chinese Journal of Luminescence,2011,32(9):864-868(in Chinese).
[4]何晓林,杨定明,胡文远,等.Li2Zn Si O4∶Eu3+红色荧光粉的制备及其发光性能[J].硅酸盐学报,2014,42(3):309-313.He X L,Yang D M,Hu W Y,et al.Synthesis and Luminescence Properties of Red Phosphor Li2Zn Si O4∶Eu3+[J].Journal of the Chinese Ceramic Society,2014,42(3):309-313(in Chinese).
[5]Thirumalai J,Chandramohan R,Auluck S,et al.Controlled Synthesis,Optical and Electronic Properties of Eu3+Doped Yttrium Oxysulfide(Y2O2S)Nanostructures[J].Journal of Colloid and Interface Science,2009,336:889-897.
[6]Cheng B C,Fang L T,Zhang Z D,et al.Ba Al2O4∶Eu2+,Dy3+Nanotube Synthesis by Heating Conversion of Homogeneous Coprecipitates andAfterglow Characteristics[J].The Journal of Physical Chemistry C,2011,115:1708-1713.
[7]周新木,曾慧慧.红色长余辉材料Y2O2S∶Eu,Si,M(M=Mg,Ca,Sr,Ba)的制备及发光性能[J].发光学报,2010,31(1):59-63.Zhou X M,Zeng H H.Synthesis and Characterization of New Long Lasting Red Phosphors Y2O2S∶Eu,Si,M(M=Mg,Ca,Sr,Ba)[J].Chinese Journal of Luminescence,2010,31(1):59-63(in Chinese).
[8]薛宏伟,崔彩娥,黄平,等.烧结温度对蓝色长余辉材料Sr2Al6O11∶Eu2+,Dy3+发光性能的影响[J].人工晶体学报,2009,38(6):1384-1393.Xue H W,Cui C E,Huang P,et al.Effects of Sintering Temperature on Luminescence Properties of Blue Long Afterglow Phosphors Sr2Al6O11∶Eu2+,Dy3+[J].Journal of Synthetic Crystals,2009,38(6):1384-1393(in Chinese).
[9]Kuang J Y,Liu Y L,Zhang J X,et al.White-light-emitting Long-lasting Phosphorescence in Dy3+-doped Sr Si O3[J].Journal of Solid State Chemistry,2006,179(1):266-269.
[10]Peng T Y.Synthesis of Sr Al2O4∶Eu,Dy Phosphor Nanometer Powders by Sol-gel Processes and Its Optical Properties[J].Materials Chemistry and Physics,2004,85(1):68-72.
[11]Liu Y F,Yang Z P,Yu Q M,et al.Luminescence Properties of Ba2Li B5O10∶Dy3+Phosphor[J].Materials Letters,2011,65(12):1956-1958.
[12]Huang P,Yang F,Cui C E,et al.Luminescence Properties of White-light Long-lasting Phosphor Y2O2S∶Dy3+,Mg2+,Si4+[J].Ceramics International,2013,39(6):7193-7197.
[13]Huang P,He X Q,Cui C E,et al.Synthesis and Luminescence Properties of Y2O2S∶Dy3+,Mg2+,Ti4+Phosphors Prepared by Sol-gel Process[J].Ceramics International,2014,40:2663-2668.
[14]Wang Z L,Wang Y H,Zhang J C,et al.The Photoluminescence Properties of Eu3+,Bi3+Co-doped Yttrium Oxysulfide Phosphor under Vacuum Ultraviolet Excitation[J].Materials Research Bulletin,2009,44:1183-1187.
[15]Elizebeth A,Thomas V,Jose G,et al.Studies on the Growth and Optical Characterization of Dysprosium Gadolinium Oxalate Single Crystals[J].Crystal Research and Technology,2004,39:105-110.
[16]Liu B,Shi C S,Qi Z M.Potential White-light Long-lasting Phosphor Dy3+-doped Aluminate[J].Applied Physics Letters,2005,86(19):191111.
[17]陈永虎,程学瑞,戚泽明,等.白色长余辉材料CaxMg Si2O5+x∶Dy3+系列的发光性能[J].发光学报,2008,29(1):119-123.Chen Y H,Cheng X R,Qi Z M,et al.Study on the Luminescent Properties of the White Long Afterglow Phosphors CaxMg Si2O5+x∶Dy3+[J].Chinese Journal of Luminescence,2008,29(1):119-123(in Chinese).
[18]Ai P F,Liu Y L,Li Y X,et al.Synthesis of Y2O2S∶Eu3+,Mg2+,Ti4+Hollow Microspheres via Homogeneous Precipitation Route[J].Science and Technology of Advanced Materials,2010,11:035002.
[19]Deng S Q,Xue Z P,Liu Y L,et al.Synthesis and Characterization of Y2O2S∶Eu3+,Mg2+,Ti4+Hollow Nanospheres via a Template-free Route[J].Journal of Alloys and Compounds,2012,542:207-212.
[20]Huang P,He X Q,Cui C E,et al.The Effect of Concentration of Dy3+Ions on Luminescence Properties of Y2O2S∶Dy3+,Mg2+,Ti4+Phosphors[J].Ceramics International,2013,40(5):6435-6440.
[21]Chen R.Glow Curves with General order Kinetics[J].Journal of the Electrochemical Society:Solid and Technology,1969,116(9):1254-1257.