材料科学
发光
光子上转换
纳米颗粒
化学工程
纳米技术
六角相
荧光
相(物质)
光电子学
有机化学
光学
化学
物理
工程类
作者
Song Ye,Guo Gong,Jingjing Du,Songhai Xie,Min Ouyang,Yu Feng,Jianxiong Xu,Ling Xu
标识
DOI:10.1166/jnn.2020.17353
摘要
Recently, lanthanide-doped upconversion luminescent materials have showed great potential in optical data storage, information encryption and anti-counterfeiting. However, the low upconversion luminescence still limited their applications. In this work, we fabricated RGB NaYF 4 :Ln 3+ @NaYF 4 core–shell nanoparticles (CSNPs) with enhanced upconversion luminescence by coating an inert NaYF 4 shell onto NaYF 4 :Ln 3+ core nanoparticles via thermal decomposition method. The effect of increased shell temperature and addition of shell precursors on crystal phase, morphology and luminescent property of the synthesized CSNPs were systematically investigated. It was demonstrated that high shell growing temperature facilitated the formation of pure β -NaYF 4 CSNPs. Upon increasing amount of shell precursors, the morphologies of hexagonal phase NaYF 4 CSNPs changed from nanorod to nanocube and showed different luminescent properties. Pure hexagonal phase NaYF 4 CSNPs with highest upconversion luminescence of about 15 times higher than NaYF 4 :Ln 3+ core nanoparticles can be prepared at 310 °C with the addition of shell precursors at 3 mmol. Moreover, three-primary-color (RGB) CSNPs with enhanced upconversion luminescence were successfully prepared by changing the doping pair of lanthanide ions in core. The synthesized RGB CSNPs were fabricated into environment friendly luminescent ink by sequential surface modification by PAA ligand and dispersing in mixture solvent of ethanol, water and glycerol. Comparative results showed that the fluorescence enhanced RGB CSNPs inks were more suitable for inkjet printing of multicolored, complex and high resolution luminescent anti-counterfeiting patterns on paper substrates.
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