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【求助】英文修改【有效期至2009年3月10日】
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请按后面对应中文，修改英文，修改之处请标记清楚，谢谢！ In order to improve the luminescent character of (Y,Gd)BO3:Eu, the method of improving crystallinity of primary raw material Y2O3 is used. The emission intensity of red phosphors (Y,Gd)BO3:Eu is effectively enhanced 8％ and 11％ respectively at origination and 720h under 147nm excitation while the other primary properties of application in Chromaticity, Granularity and decentralization are not changed. The anti-ageing character is elevated. The origins of the enhancement and elevation are discussed and analyzed preliminarily. It is likely that the abnormal change and defect of crystal checks led by the substitution of larger radius Eu3+ ion for smaller radius Y3+ ion are reduced by the better crystal quality of (Y,Gd)BO3:Eu from the better crystallinity of raw material Y2O3. Because the crystal field condition of the Eu3+ ion is improved, radiationless process and energy loss led by crystal defect are cut down, the emission efficiency of (Y,Gd)BO3:Eu phosphors is enhanced and its anti-ageing character is improved. The experiment shows that the decomposing temperature to get the high crystallinity Y2O3 is about 1400℃. 为进一步改善(Y, Gd)BO3:Eu的发光性能，采用改善主要原材料Y2O3结晶性的方法，使(Y, Gd)BO3:Eu红色荧光粉的在真空紫外147nm激发下初始和连续激发720h发光强度增强～8％和11％, 提高了粉体的抗老化特性，且不影响色度，粒度，粉体分散性等主要考核指标。讨论和分析了发射强度增强、抗老化特性改善的原因：主要原材料Y2O3的结晶性的改善，使得合成的(Y, Gd)BO3:Eu能具有更好的晶体质量，Eu3+离子晶场环境得到进一步改善，从而减弱了无辐射过程及因晶格畸变所造成的能量损失，因而发光效率得到增强，抗老化特性得到改善。实验表明，获取高质量多晶Y2O3的最佳分解温度为1400℃左右。 |
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