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Mn2+, Pb2+共掺杂ZnS纳米材料制备及光致发光
引用本文:徐扬子,胡鹤. Mn2+, Pb2+共掺杂ZnS纳米材料制备及光致发光[J]. 发光学报, 2007, 28(4): 589-593
作者姓名:徐扬子  胡鹤
作者单位:1. 湖北大学, 物理学与电子技术学院, 湖北, 武汉, 430062;2. 湖北大学, 化学与材料科学学院, 湖北, 武汉, 430062
摘    要:采用聚乙烯基吡咯烷酮(PVP)为表面包覆剂,在室温大气条件下的水溶液中制备了ZnS:Mn,Pb纳米晶。讨论了Mn2+和Pb2+掺杂量对ZnS纳米发光材料光致发光强度的影响,确定了Mn2+和Pb2+掺杂量相对于Zn2+的最佳的量的比,并对其发光机理进行了初步的探讨。

关 键 词:光致发光  ZnS  纳米晶  共掺杂  半导体
文章编号:1000-7032(2007)04-0589-05
收稿时间:2006-09-28
修稿时间:2006-09-282006-12-26

Preparation and Photoluminescence Properties of ZnS Nanocrystals Co-doped with Mn2+ and Pb2+
XU Yang-zi,HU He. Preparation and Photoluminescence Properties of ZnS Nanocrystals Co-doped with Mn2+ and Pb2+[J]. Chinese Journal of Luminescence, 2007, 28(4): 589-593
Authors:XU Yang-zi  HU He
Affiliation:1. Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China;2. Faculty of Chemistry and Material Science, Hubei University, Wuhan 430062, China
Abstract:Nanocrystals doped with optically active luminescence centers create new opportunities for luminescent study and application of nanoscale materials.ZnS is the most typical and important crystalline phosphor in both applications and basic science,and doping might change its properties,especially,the transition metallic ions co-activated ZnS nanoparticles form a new class of luminescent materials.The arrested chemical precipitation method is the most popular technique that is used in industrial applications because of its cheap raw materials,easy handing and large-scale production,many doped ZnS nano-particles were prepared by this method.In order to volume-produce homodisperse free-standing,with good surface,and high luminescent doped ZnS nanoparticles,polymer PVP was used as surfactant.Preparation produce was as follows:6.0 g PVP was dissolved in 70~80 mL ultrapure water(R≈18 MΩ),while the solution was stirred,10 mL of 1 mol·L-1 Zn(CH3COO)2·2H2O,and 1~7 mL of 0.1 mol·L-1 Mn(CH3COO)2·4H2O,0.1~2 mL of 0.1 mol·L-1 Pb(CH3COO)2·3H2O were then added.After stirring for 15 min,10 mL of 1 mol·L-1 Na2S·9H2O was injected,a suspension occurred immediately.After centrifuging and washing the particles twice with distilled water and once with ethanol.The nano-particles were dried in vacuum.All agents used are analytical pure and without further treatment.Nanocrystalline ZnS:Mn2+,Pb2+ have been prepared via the precipitation method at room temperature and under ambient conditions.X-ray diffraction analysis shows that the average crystalline particles size of samples is about 2~4 nm.TEM image shows the nanoparticles are homodisperse.By measurement of the fluorescence spectra,the excitation(λexc≈410 nm) and emission(λem≈510~560 nm) wavelength are both in visible-light range.A novel luminescent property has been observed in the photoluminescence(PL) spectra of the ZnS:Mn2+,Pb2+ nanocrystals.These nanocrystals can be doped with Mn2+ and Pb2+ during the synthesis without altering the X-ray diffraction pattern,however,the PL intensities of the co-doped samples vary with changing of the impurity mole ratios in the Mn2+ and Pb2+ co-doped samples,but the emission wavelength is not changed with the changing of the impurity mole ratios.The PL properties of the co-doped samples are dramatically different from those of Mn2+ and Pb2+ single doped ZnS nanorystals,and a probable explanation is presented also.All the results strongly reveal that co-doped ZnS nanocrystals form a new class of luminescent materials.
Keywords:photoluminescence  ZnS  nanocrystals  co-doped  semiconductor
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