Nd^(3+)掺杂的NaYF_4∶Yb,Er/Tm上转换纳米颗粒的光谱分析  

Research on Photoluminescence of Nd^(3+) Doped NaYF_4:Yb, Er/Tm Upconversion Nanoparticles

作　　者：叶帅[1] 宋军[1] 陈林春[1] 王东[1] 彭晓[1] 屈军乐[1] 

机构地区：[1]深圳大学光电工程学院教育部光电子器件与系统重点实验室,广东深圳518060

出　　处：《光学学报》2015年第8期221-225,共5页Acta Optica Sinica

基　　金：国家重点基础研究发展计划(2015CB352005);国家自然科学基金(61378091;11204226;61405123)

摘　　要：生物组织对980 nm波长的光有较强的吸收,限制了Yb/Er或Yb/Tm共掺的Na YF4上转换纳米颗粒在生物方面的应用范围。通过对Na YF4∶Yb,Er/Tm纳米颗粒进行Nd掺杂,获得可在800 nm波长的激光激发下产生荧光的纳米颗粒。对多种不同形貌的Nd掺杂纳米颗粒的荧光光谱的研究表明,具有核壳结构的Na YF4∶Yb3+20%,Er3+2%@Na YF4∶Nd3+20%纳米颗粒在800 nm激光激发下的荧光强度最高,基本上与Na YF4∶Yb3+20%,Er3+2%纳米颗粒在980 nm激光激发下的荧光强度相当,其强度比Na YF4∶Yb3+20%,Er3+2%,Nd3+20%纳米颗粒提高了600倍以上。分析表明,Nd掺杂导致的淬灭效应主要来自于Nd和光敏剂Yb之间的作用,而不是与活化剂Er/Tm之间的作用。Strong absorption of 980 nm wavelength light by biological tissues results in the limited application of Yb/Er or Yb/Tm doped Na YF4 upconversion nanoparticles. 800 nm excited Na YF4∶Yb, Er/Tm nanoparticles doped with Nd3 ＋ions are reported. By comparing the photoluminescence spectra of different structured nanoparticles incorporated with Nd3 ＋ions, it is found that the emission intensity by 800 nm laser of core/shell structured Na YF4∶Yb3＋20%, Er3＋2%@Na YF4∶Nd3＋20% nanoparticles is the highest, which is close to the emission intensity of Na YF4∶Yb3 ＋20%, Er3 ＋2% nanoparticles excited by 980 nm laser. The emission intensity is enhanced by more than 600 times compared with that of Na YF4∶Yb3＋20%, Er3＋2%, Nd3＋20% nanoparticles. It is proved that the quench effect due to Nd incorporation is mainly related to the interaction between Nd3 ＋ions and the sensitizer Yb3＋ions, but not that between Nd3＋ions and the activator Er3＋/Tm3＋ions.

关 键 词：材料 上转换纳米颗粒 Nd3+掺杂 核壳结构 荧光光谱 

分 类 号：O611.3[理学—无机化学]