Nd3+掺杂的NaYF4:Yb@NaYF4:Ho上转换纳米颗粒的光谱分析

doi:10.15541/jim20160285

摘要/Abstract

摘要：

上转换纳米颗粒因具有良好的穿透深度和发光强度被广泛地应用在生物标记或生物成像中。实验制备了核壳结构的NaYF₄:Yb@NaYF₄:Ho纳米颗粒, 分散均匀, 粒径在50 nm左右。通过光谱分析可知, 该纳米颗粒可在980 nm激光激发下发射波长为650 nm为主的发射光。进一步对该核壳结构的NaYF₄:Yb@NaYF₄:Ho纳米颗粒进行Nd³⁺掺杂, 制备了可被800 nm激光激发且发射强红光的纳米颗粒。通过比较多种不同结构的Nd³⁺掺杂NaYF₄:Yb@NaYF₄:Ho纳米颗粒的荧光光谱发现, NaYF₄:Yb@NaYF₄:Ho,Nd纳米颗粒发射光最强, 表明Nd³⁺掺杂在NaYF₄:Yb@NaYF₄:Ho纳米颗粒的壳层中最佳。最后对NaYF₄:Yb³⁺50%@NaYF₄:Ho³⁺1%,Nd³⁺x%纳米颗粒Nd³⁺离子的掺杂浓度进行优化, 实验结果表明: Nd³⁺掺杂浓度为30%时,该纳米颗粒在800 nm激光激发下发光强度最强。

关键词: 上转换纳米颗粒, Nd3+掺杂, 核壳结构

Abstract:

Upconversion nanoparticles are widely used in bioimaging and biomarkers because of their excellent penetration depth and strong luminescence. Mono dispersed core-shell structured NaYF₄:Yb@NaYF₄:Ho nanoparticles with sizes of about 50 nm were synthesized. It was found by spectral analysis that these nanoparticles emitted light centered at a wavelength of 650 nm under the 980 nm laser excitation. Further Nd³⁺ doping caused the NaYF₄:Yb@NaYF₄:Ho nanoparticles to emit strong red light under the 800 nm laser excitation. By analyzing the fluorescence spectra of the Nd³⁺doped NaYF₄:Yb@NaYF₄:Ho nanoparticles with different structures, it was found that the emission intensity of the NaYF₄:Yb@NaYF₄:Ho, Nd nanoparticles was the strongest, indicating that doping Nd³⁺ ions into the shell layer of the NaYF₄:Yb@NaYF₄:Ho nanoparticles was optimal choice. Finally, the Nd³⁺ concentration of the NaYF₄:Yb³⁺50%@NaYF₄:Ho³⁺1%, Nd³⁺x% nanoparticles was optimized. The experimental results show that the optimized concentration of Nd³⁺ ions is 30%, the luminescence intensity of the NaYF₄: Yb³⁺50%@NaYF₄:Ho³⁺1%,Nd³⁺30% nanoparticles is strongest under an 800 nm laser excitation.

Key words: upconversion nanoparticles, Nd3+ dopant, core-shell structure

中图分类号:

TQ174

熊茂珍, 叶帅, 王广盛, 宋军, 屈军乐. Nd³⁺掺杂的NaYF₄:Yb@NaYF₄:Ho上转换纳米颗粒的光谱分析[J]. 无机材料学报, 2017, 32(2): 180-184.

XIONG Mao-Zhen, YE Shuai, WANG Guang-Sheng, SONG Jun, QU Jun-Le. Spectra Analysis of Nd³⁺ Sensitized NaYF₄:Yb@NaYF₄:Ho Upconversion Nanoparticles[J]. Journal of Inorganic Materials, 2017, 32(2): 180-184.

图/表 6

图1 NaYF4:Yb/Ho纳米颗粒的TEM照片

Fig. 1 TEM images of NaYF4:Yb/Ho nanoparticles(a) NaYF4:Yb3+50%, Ho3+1%; (b) NaYF4:Yb3+50%@NaYF4:Ho3+

图2 Yb/Ho共掺的NaYF4纳米颗粒在980 nm激发光下的荧光光谱图

Fig. 2 Fluorescence spectra of NaYF4:Yb/Ho nanoparticles excited by 980 nm laser

图3 800 nm激光激发的Nd3+掺杂的NaYF4:Yb@NaYF4:Ho纳米颗粒的荧光光谱图

Fig. 3 Fluorescence spectra of Nd3+ doped NaYF4:Yb@NaYF4:Ho nanoparticles excited by 800 nm laser

图4 NaYF4:Yb3+50%@NaYF4: Nd3+20% ,Ho3+1%纳米颗粒发射光谱中红光强度和绿光强度随激发能量的变化关系

Fig. 4 Logarithmic plot of the dependence of the intensities of the green and the red UC emission bands on the pump power for NaYF4:Yb3+50%@NaYF4: Nd3+20%, Ho3+1%UCNPs

图5 核壳结构的NaYF4:Yb3+50%@NaYF4:Ho3+1%,Nd3+20%纳米颗粒的(a)结构示意图、(b)能量传递示意图和(c)Nd3+掺杂的NaYF4:Yb/Ho核壳纳米颗粒能量传递结构示意图

Fig. 5 (a) Schematic illustration of NaYF4:Yb3+50%@NaYF4:Ho3+1%,Nd3+20% nanoparticles, (b) schematic illustration of the proposed energy-transfer mechanisms in NaYF4:Yb3+50%@NaYF4:Ho3+1%,Nd3+20% nanoparticles, and (c) energy level diagrams of Nd3+,Yb3+ and Ho3+ ions and proposed up-conversion mechanisms

图6 不同Nd3+浓度的NaYF4:Yb3+50%@NaYF4:Ho3+1%纳米颗粒的(a)980 nm和(b) 800 nm激发光谱图

Fig. 6 Fluorescence spectra of NaYF4:Yb3+50%@NaYF4:Ho3+1% nanoparticles doped with different Nd3+concentrations excited by (a) 980 nm and (b) 800 nm laser

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Nd³⁺掺杂的NaYF₄:Yb@NaYF₄:Ho上转换纳米颗粒的光谱分析

Spectra Analysis of Nd³⁺ Sensitized NaYF₄:Yb@NaYF₄:Ho Upconversion Nanoparticles

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