以尿素为沉淀剂，柠檬酸为表面活性剂，通过水热法得到了非晶态的水合硝酸氧钇前驱体，进一步烧结处理后生成了立方相Y2 O3纳米晶．利用X－射线衍射（ XRD）、扫描电镜（ SEM）、透射电镜（ TEM）、红外光谱（ FTIR）和荧光光谱（ PL）分别对所得样品的相结构、形貌粒度、表面结构以及发光性能进行研究．结果表明：当烧结温度从600℃升高到900℃，Y2 O3∶Eu3＋纳米颗粒的结晶性增强，并实现了粒径调控，由13．0 nm增加至27．9 nm．随着Y2 O3∶Eu3＋纳米颗粒尺寸的增加，比表面积减小会导致发光离子附近的表面晶格缺陷降低，同时纳米晶表面吸附水、硝酸根以及柠檬酸根等杂质离子逐渐被去除，减少了荧光猝灭中心，从而有利于增强荧光发射强度以及延长荧光寿命．
Y2 O3∶Eu3+red nanophosphors were synthesized by a hydrothermal method with citric acid as a complex agent and urea as precipitant and an annealing process at different temperatures ranging from 600 to 900 ℃. The obtained powders were characterized by X?ray diffractometry ( XRD ) , scanning electron microscopy ( SEM ) , transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and photoluminescence spectroscopy (PL). Effects of annealing treatment on structural, morphological and photoluminescence properties of Y2 O3∶Eu3+are investigated. XRD results revealed that Y2 O3∶Eu3+powders crystallized in cubic phase after annealing treatment. The average crystallite size increased from 13.0 to 27.9 nm as temperature increasing. Moreover, it is demonstrated that annealing treatment can give rise to changes in surface structures. The luminescence emission intensity and average lifetimes of Y2 O3∶Eu3+powders are enhanced with increasing crystallite size, which is attributed to the decrease of the surface defect states due to the declined ratio of surface to volume and the removal of surface absorbance such as hydroxyl groups, nitrate and citric species.
参考文献
| [1] | Liangjun Zhou;Zhanjun Gu;Xiaoxiao Liu.Size-tunable synthesis of lanthanide-doped Gd2O3 naeoparticles and their applications for optical and magnetic resonance imaging[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,20123(3):966-974. |
| [2] | Jie Zheng;Chen Zhou;Mengxiao Yu.Different sized luminescent gold nanoparticles[J].Nanoscale,201214(14):4073-4083. |
| [3] | Wen Xu;Yu Wang;Xue Bai.Controllable Synthesis and Size-Dependent Luminescent Properties of YVO4:Eu~(3+) Nanospheres and Microspheres[J].The journal of physical chemistry, C. Nanomaterials and interfaces,201033(33):14018-14024. |
| [4] | Diane K. Williams;Huabiao Yuan;Brian M. Tissue.Size dependence of the luminescence spectra and dynamics of Eu~(3+): Y_2O_3 nanocrystals[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,199984(84):297-300. |
| [5] | Qilin Dai;Hongwei Song;Meiyuan Wang.Size and Concentration Effects on the Photoluminescence of La2O2S:Eu~(3+) Nanocrystals[J].The journal of physical chemistry, C. Nanomaterials and interfaces,200849(49):19399-19404. |
| [6] | 邢明铭;曹望和.纳米Y2O2S：Tb X射线发光粉的合成及发光性质[J].材料科学与工艺,2009(1):51-54. |
| [7] | Feng Wang;Juan Wang;Xiaogang Liu.Direct Evidence of a Surface Quenching Effect on Size-Dependent Luminescence of Upconversion Nanoparticles[J].Angewandte Chemie,201041(41):7456-7460. |
| [8] | Satoru Takeshita;Hiroko Ogata;Tetsuhiko Isobe.Effects of Citrate Additive on Transparency and Photostability Properties of YVO_4:Bi~(3+),Eu~(3+) Nanophosphor[J].Journal of the Electrochemical Society,20103(3):J74-J80. |
| [9] | Satoru Takeshita;Tatsuya Watanabe;Tetsuhiko Isobe;Tomohiro Sawayama;Seiji Niikura.Improvement of the photostability for YVO_4:Bi~(3+),Eu~(3+) nanoparticles synthesized by the citrate route[J].Optical materials,20113(3):323-326. |
| [10] | 刘凤珍;邵鑫;尹贻彬;赵利民;孙巧珍;邵珠伟;刘雪华;孟宪华.稀土离子掺杂钒酸盐发光材料的研究现状及进展[J].中国材料进展,2011(4):44-48. |
| [11] | 纳米稀土发光材料的研究与展望[J].矿产保护与利用,2005(05):44-47. |
| [12] | A. Boukerika;L. Guerbous.Annealing effects on structural and luminescence properties of red Eu~(3+)-doped Y_2O_3 nanophosphors prepared by sol-gel method[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,2014:148-153. |
| [13] | 付晓燕;牛淑云;张洪武;辛勤.络合溶胶-凝胶法制备纳米级Y2O3：Ln（Eu,Dy,Sm,Tb）发光体[J].功能材料,2004(5):635-637. |
| [14] | 司伟;姜妲;高宏;王修慧;翟玉春.Ca2+、La3+掺杂纳米Y2O3∶Eu3+的超声波制备及光致发光性能[J].稀土,2008(5):24-29. |
| [15] | 颜虹云;包娜;沈林;汪效祖.水热法合成不同形貌纳米氧化钇粉体[J].热加工工艺,2010(20):66-68,72. |
| [16] | 李渝;尹剑波;赵晓鹏.两步法制备单分散的Li掺杂Y2O3：Eu3+微球及其发光性能[J].功能材料,2011(2):336-338. |
| [17] | 王莹;赵高扬.水热合成棒状氧化钇粉体的生长过程和生长机理的研究[J].功能材料,2013(5):649-652. |
| [18] | Zhai Yongqing;Yao Zihua;Ding Shiwen.Synthesis and characterization of Y_2O_3: Eu nanopowder via EDTA complexing sol-gel process[J].Materials Letters,200319(19):2901-2906. |
| [19] | Li, N;Yanagisawa, K.Controlling the morphology of yttrium oxide through different precursors synthesized by hydrothermal method[J].Journal of Solid State Chemistry,20088(8):1738-1743. |
| [20] | Su YG;Li GS;Xue YF;Li LP.Tunable physical properties of CaWO4 nanocrystals via particle size control[J].The journal of physical chemistry, C. Nanomaterials and interfaces,200718(18):6684-6689. |
| [21] | Du, C.;Yi, G.;Su, Y.;Liu, Z..Synthesis, characterization, and enhanced luminescence of CaWO _4:Eu ~(3+)/SBA-15 composites[J].Journal of Materials Science,201217(17):6305-6314. |
| [22] | P. Packiyaraj;P. Thangadurai.Structural and photoluminescence studies of Eu~(3 +) doped cubic Y_2O_3 nanophosphors[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,2014:997-1003. |
| [23] | Akita, Yukihiko;Harada, Takashi;Sasai, Ryo;Tomita, Koji;Nishiyama, Katsura.Emission properties of Ln (Eu, Tb, Dy, Er)-doped Y2O3 nanoparticles synthesized by surfactant-assembly and their applications in visible color-tuning[J].Journal of Photochemistry and Photobiology, A. Chemistry,2015:87-93. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%