透明β-NaYF_4∶Yb,Tm/PMMA纳米复合材料的制备及其光学性能  

Synthesis and Optical Properties of Transparent β-NaYF_4∶ Yb,Tm /PMMA Nanocomposites

作　　者：宋艳[1] 丁明烨[1] 黄文娟[1] 倪亚茹[1] 陆春华[1] 许仲梓[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《发光学报》2014年第3期293-299,共7页Chinese Journal of Luminescence

基　　金：江苏高校优势学科建设工程项目(PAPD);江苏省高校自然科学研究重大项目(10KJA430016)资助

摘　　要：采用高温溶剂热法制备了一系列不同Yb3+掺杂浓度的上转换发光纳米粒子β-NaYF4∶Yb,Tm和核壳结构的β-NaYF4∶Yb,Tm@β-NaYF4∶Yb纳米粒子。采用X射线衍射(XRD)、场发射扫描电镜(FESEM)、光致发光(PL)谱对材料的物相结构、形貌特征和发光性质进行了表征和研究,并特别研究了温度对材料发光性能的影响。结果表明:保持Tm3+浓度不变,随着Yb3+掺杂浓度的增加,β-NaYF4∶Yb,Tm的发光强度先增大后减小。当Yb3+掺杂摩尔分数为30%时,474 nm和645 nm处的发光强度达到最大值;当Yb3+掺杂摩尔分数为50%时,450 nm和692 nm处的发光强度达到最大值。在β-NaYF4∶Yb(30%),Tm上包裹一层β-NaYF4∶Yb壳层后,其发光显著增强,随壳层Yb3+摩尔分数的增加,发光强度也是先增大后减小。当壳层Yb3+摩尔分数为10%时,核壳结构纳米粒子的发光强度达到最大值;当壳层Yb3+摩尔分数达到40%时,核壳结构纳米粒子的发光强度已经低于未包裹时。将样品进行热处理后,荧光增强。样品的发光强度随环境温度的升高,红光变弱,蓝光增强。采用原位聚合法将β-NaYF4∶Yb,Tm纳米粒子与PMMA制成复合材料后,仍能保持较好的透明度和发光强度。The hexagonal β-NaYF4∶ Yb,Tm particles and core-shell structure β-NaYF4∶ Yb,Tm@ β-NaYF4∶ Yb particles were prepared by solvothermal method. The as-prepared particles were characterized using X-ray diffraction( XRD),field emission scanning electron microscopy( FESEM),and photoluminescence( PL) spectra. With the increasing of Yb3 +concentration,the luminus intensity of β-NaYF4∶ Yb,Tm particle first increases,then decreases. When the mole fraction of Yb3 +is 30%,the intensities of 474,645 nm reach the maximum,and when the mole fraction of Yb3 +is 50%,the intensities of 450,692 nm reach the maximum. Then β-NaYF4∶ 30%Yb,Tm particls were coated by β-NaYF4∶ Yb layer. When the mole fraction of Yb3 +in shell layer is 10%,the luminus intensity of β-NaYF4∶ Yb,Tm@ β-NaYF4∶ Yb particle is the maximum. The luminus intensities of all the samples increase after heat treatment,and the blue luminus intensity decreases and red luminus intensity increases with the increasing of ambient temperature. The transparent composite materialsof β-NaYF4∶ Yb,Tm and PMMA were synthesized by in situ polymerization,and showed good luminescence property.

关 键 词：上转换发光 掺杂浓度 核壳结构 NAYF4 

分 类 号：O482.31[理学—固体物理]