运用碳热还原氮化法(CRN)合成了Sr2Si5N8和Sr2Si5N8∶Eu2+粉体,所得到物相的XRD图谱显示,掺杂Eu2+后比掺杂前峰值向高角度方向偏移.荧光图谱显示掺杂后激发光谱处于紫外和近紫外光范围,发射光谱峰值处于红光处.利用第一性原理基于密度泛函理论的平面波赝势法计算了Sr2Si5N8与Sr2Si5N8∶Eu2+的能带结构与电子态密度,发现Eu2+的加入使得体系拥有了易于将能量以光子形式放出的直接带隙跃迁机制,并且使得整个体系带隙减小,结合实验结果,揭示了该体系材料的微观发光机理.
参考文献
| [1] | 翟永清,冯仕华,孔令帅,殷天亮,郝洁.新型超细蓝色荧光粉Sr_2MgSi_3O_9： Eu~（2+）的合成及发光性质[J].人工晶体学报,2009(05):1078-1082. |
| [2] | 耿秀娟,陈永杰,田彦文,王瓒,肖林久.白光LED用新型硅基氮化物红色荧光粉研究进展[J].化工新型材料,2010(11):15-17. |
| [3] | Sharma, G.;Gosavi, S.W.;Lochab, S.P.;Singh, N. .Studies on luminescence properties and energy transfer in Ce/Dy co-doped CaS nano-phosphors[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,2012(10):2619-2625. |
| [4] | Li-Te Chen;I-Lei Sun;Chii-Shyang Hwang;Shoou-Jinn Chang .Luminescence properties of BAM phosphor synthesized by TEA coprecipitation method[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,2006(2):293-300. |
| [5] | 宋亚珍,陈俊华,徐鑫.Eu2+掺杂的Ca-α-SiAlON和Mg-α-SiAlON荧光粉的光学性质和电子结构[J].光谱实验室,2012(03):1293-1298. |
| [6] | Imai Y.;Tsunoda T.;Mukaida M. .Calculation of electronic energy and density of state of iron-disilicides using a total-energy pseudopotential method, CASTEP[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2001(2):176-182. |
| [7] | Milman, V.;Refson, K.;Clark, S.J.;Pickard, C.J.;Yates, J.R.;Gao, S.-P.;Hasnip, P.J.;Probert, M.I.J.;Perlov, A.;Segall, M.D. .Electron and vibrational spectroscopies using DFT, plane waves and pseudopotentials: CASTEP implementation[J].Journal of Molecular Structure. Theochem: Applications of Theoretical Chemistry to Organic, Inorganic and Biological Problems,2010(1/3):22-35. |
| [8] | Oliver Oeckler;Florian Stadler;Tobias Rosenthal .Real structure of SrSi_2O_2N_2[J].Solid state sciences,2007(2):205-212. |
| [9] | 可祥伟,张蓉,杨春燕,刘骞,张利民.ZnAl2O4的电子结构及光学性质的第一性原理计算[J].人工晶体学报,2013(02):268-272. |
| [10] | 曾冬,符春林,蔡苇,郭倩,谭平,张朝阳.Ni掺杂ZnS的第一性原理计算[J].人工晶体学报,2013(01):166-171. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%