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【求助】中译英一小段
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中译英一小段。请勿用软件作简单翻译，谢谢！ 通过调节基质组分比例，研究了SrAl2xO3x+1:Eu2+,Dy3+（x=1~2）荧光粉晶体结构，发光性质及长余辉特性。选取硝酸锶和硝酸铝作为基质原材料，硼酸氨和氟化铝作为助溶剂，采用阳离子草酸盐共沉淀、湿法混合及分步合成等方法，制备了亮度高、余辉长及良好粒径分布的系列长余辉发光材料。基于对样品X射线衍射图谱，激发、发射光谱和余辉衰减曲线测量及分析，发现SrAl2xO3x+1: Eu2+,Dy3+具有良好的结晶状态；随x增加，发射光谱峰值从520nm蓝移至470nm；衰减到可辨认发光强度0.32mcd/m2余辉时间可相应地从30h延长到60h以上。表现不同余辉特性的主要原因是Eu2+在基质中具有不同浓度、不同衰减速度的蓝、绿两种发光中心造成的，其中蓝发光中心寿命明显高于绿发光中心。 |
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翻译参考
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翻译参考： By adjusting the proportion of host composition, the crystal structure, luminescent properties and long afterglow characteristics of phosphor SrAl2xO3x+1: Eu2+, Dy3+(x=1~2) are studied. Selecting strontium nitrate and aluminum nitrate as raw materials of host, ammonium borate and aluminum fluoride as fluxes, and using cationic oxalic acid co-precipitation, wet mixing, stepwise synthesis etc., a series of long-afterglow phosphors with high-brightness, long duration time and good particle-size distribution are prepared. Based the analyses on X-ray diffraction pattern, excitation and emission spectra, and afterglow decay curve of the sample, it is found that SrAl2xO3x+1: Eu2+, Dy3+ has a good crystal structure; the emission peak show blueshift from 520nm to 470nm as x increase; The afterglow time for attenuation to recognizable luminous intensity (0.32mcd/m2) can be extended from 30h to above 60h. The main reason of different afterglow is that there are two Eu2+ luminous centers (blue and green-emitting) with different concentration and different fluorescence-decay time in the host. The fluorescence lifetime of blue-emitting center is apparently higher than that of the green-emitting one. |
8楼2009-08-24 18:00:32
| 难。。。。。。。。。。。。。。 |
2楼2009-08-23 10:56:55
仅供参考
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168yjh(金币+5,VIP+0):谢谢参与 8-24 17:55
168yjh(金币+5,VIP+0):谢谢参与 8-24 17:55
| By adjusting the matrix component proportion，research the phosphor crystal structure of SrAl2xO3x+1:Eu2+,Dy3+（x=1~2）, luminance and persistence characteristic.Select strontium nitrate and aluminium nitrate as stroma materials, use AmmoniumBorate and aluminium fluoride as latent solvent, synthesis series of long-lasting phosphor by the stepwise synthesis and co-precipitates of oxalates ,wet-mixing. the long-lasting phosphor in the paper having the qualities of High brightness,long afterglow, Good particle size distribution. |
3楼2009-08-23 13:15:42
4楼2009-08-23 13:34:58