稀土离子掺杂的微晶体上转换发光特性研究  

Study on Up-Conversion Luminescence Properties of Rare Earth Ion Doped Microcrystals

作　　者：吴佳玲 Wu Jialing(College of Science,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China)

机构地区：[1]西安建筑科技大学理学院,陕西西安710055

出　　处：《激光与光电子学进展》2022年第7期253-260,共8页Laser & Optoelectronics Progress

摘　　要：为提高稀土离子掺杂的微/纳米材料的上转换荧光强度,利用油酸乙醇辅助的水热法合成了一系列NaYF_(4)∶Yb^(3+),Tm^(3+)和NaLuF_(4)∶Yb^(3+),Tm^(3+)微晶体。对水热产品进行了低温退火处理,同时,通过控制Yb^(3+)的掺杂量对微晶体进行形貌微调以实现光谱调控。光谱研究的结果表明,相比于母晶,经过低温退火处理的样品的荧光强度显著增强。利用柠檬酸钠作为表面活性剂,采用水热法合成了一系列的NaLuF_(4)∶Yb^(3+),Tm^(3+)微晶体,进一步提高了其荧光强度,并且荧光强度随Yb^(3+)的浓度增加而增强。随后将Ho^(3+)引入NaLuF_(4)∶Yb^(3+),Tm^(3+)系统,通过调节Tm^(3+)、Ho^(3+)的掺杂量达到调控荧光颜色和发光强度的目的,采用激光光谱学方法研究了不同掺杂量下的荧光强度和色彩的变化。考虑到NaLuF_(4)∶Yb^(3+),Tm^(3+)优良的荧光特性,将其制成安全墨水应用于防伪,展现了其在防伪领域的应用潜力。In order to improve the up-conversion fluorescence intensity of rare earth ions doped micro/nano materials,a series of NaYF_(4)∶Yb^(3+),Tm^(3+) and NaLuF_(4)∶Yb^(3+),Tm^(3+) microcrystals are synthesized by oleic acid and ethanol assisted hydrothermal method.The hydrothermal products are annealed at low temperature.At the same time,the morphology of the microcrystals is fine-tuned by controlling the doping amount of Yb^(3+) to achieve spectral regulation.The results of spectral studies show that the fluorescence intensity of the samples annealed at low temperature is significantly enhanced compared with that of the parent crystals.A series of NaLuF_(4)∶Yb^(3+),Tm^(3+) microcrystals are synthesized by hydrothermal method using sodium citrate as surfactant,and the fluorescence intensity is further improved,and the fluorescence intensity increased with the increase of Yb^(3+) concentration.Subsequently,Ho^(3+) is introduced into the NaLuF_(4)∶Yb^(3+),Tm^(3+) system to regulate the fluorescence color and luminous intensity by adjusting the doping amount of Tm^(3+) and Ho^(3+).The changes of fluorescence intensity and color under different doping amounts are studied by laser spectroscopy.Taking into account the excellent fluorescence properties of NaLuF_(4)∶Yb^(3+),Tm^(3+),which is made for safety ink and applied to anti-counterfeiting,showing its potential application in the anti-counterfeiting field.

关 键 词：材料 稀土发光 荧光强度 水热法 防伪 

分 类 号：O433[机械工程—光学工程]