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| 1 | Spectroscopic properties of Gd_2O_3:Dy^(3+)nanocrystals显示文摘Gd2O3:Dy3+ nanocrystals were synthesized via solvothermal method followed by a subsequent calcination.The samples were characterized by X-ray diffraction(XRD),transmission electron microsopy(TEM),Electronic dispersive X-ray spectroscopy(EDX),photoluminescence(PL)spectrum and decay curves.The effect of the annealing temperature on the crystallinity and particle size was studied;heat treatment improved the crystallinity of as-prepared nanocrystals as well as increased their particle size.The nanocryatals presented monodispersed spherical shape under TEM.Photoluminescence spectra showed that nanocrystal exhibited strong yellow emission corresponding to 4F9/2→6H13/2 transition(573 nm)of Dy3+ under UV light excitation,which broadened with the particle size decreased without structure changed.The theoretical mechanism of luminescence was explored and surface effect was thought to be the main reason. | 彭玲玲 韩涛 陈慧 张铁军 | 2013 | Journal of Rare Earths2013，31，3： | 1 |
| 2 | Y_2O_3双掺杂Eu^(3+),Tb^(3+)的光谱性能及能量传递过程显示文摘采用溶胶凝胶法制备不同配比的Y2O3:Eu3+、Y2O3:Tb3+和Y2O3:Eu3+,Tb3+荧光粉。并通过XRD、SEM和激发、发射光谱对其结构和发光性能进行了研究,用能级图解释了激活剂之间的能量传递关系。结果表明,材料结晶良好,粒度分别为20、31nm和17nm左右,样品形貌类似片状结构。(Y110Eu)2kO3和(Y110Tb)2kO3配比时相对发光强度最高。而共掺杂时,存在着强烈的Eu3+向Tb3+的能量转移,导致红色发光强度的降低而敏化了绿光和蓝光的发射。分析可知,除了激活剂的含量对发光性能有强烈的影响之外,不同的激发波长对体系混合光的形成有很大的影响。当在305nm的激发波长下,可以得到红绿蓝混合光,实现了通过一种荧光粉的激发,发射出近白色的光。为改变灯用三基色荧光粉的组成并降低成本奠定了有利的实验基础。 | 李霞 张胤 许剑轶 王瑞芬 | 2012 | 光谱实验室2012，29，6： | 0 |
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