Stokes emission in GdF₃:Nd³⁺ nanoparticles for bioimaging probes.

Stokes emission in GdF₃:Nd³⁺ nanoparticles for bioimaging probes.
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DOI:
10.1039/c3nr03317a
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发表时间:
2014
期刊:
影响因子:
6.7
通讯作者:
Sardar DK
Sardar DK
中科院分区:
材料科学2区
文献类型:
--
作者:
Pokhrel M;Mimun LC;Yust B;Kumar GA;Dhanale A;Tang L;Sardar DK

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稀土掺杂纳米颗粒由于其在近红外光谱区的强烈吸收和光致发光而受到越来越多的关注。由于在红外激发下生物样本中不存在自发荧光,这些基于近红外的纳米颗粒(NP)可以在相当大的深度进行生物成像,具有增强的对比度和高空间分辨率。在这里,我们提出了高效的红外光致发光GdF 3:Nd 3+纳米粒子在800 nm激发下的流体动力学尺寸限制的生物应用。研究了粉体、聚马来酸酐- alt-1-辛二烯(PMAO)包覆粉体和胶体溶液的下转换(斯托克斯发射)绝对量子产率(QY)。QY测量已经揭示,平均5 ± 2nm尺寸的GdF 3:1%Nd3+胶体NP中的下转换(斯托克斯发射)QY比相同尺寸的高效上转换(UC)颗粒NaYF 4:20%Er/2%Yb高2000倍。此外,这些近红外发射纳米粒子的生物成像探针的实用性已被证明通过共聚焦成像和光谱研究。
There is an increasing interest in rare earth (RE) doped nanoparticles (NPs) due to their sharp absorption and photoluminescence (PL) in the near infrared (NIR) spectral region. These NIR based nanoparticles (NPs) could allow biological imaging at substantial depths with enhanced contrast and high spatial resolution due to the absence of auto fluorescence in biological samples under infrared excitation. Here, we present the highly efficient infrared photoluminescence in GdF3:Nd3+ nanoparticles under 800 nm excitation within the hydrodynamic size limitations for bio-applications. The downconversion (Stokes emission) absolute quantum yield (QY) measurements in powder, poly maleic anhydride- alt-1- octadicene (PMAO) coated powder and colloidal solutions have been investigated. QY measurements have revealed that downconversion(Stokes emission)QY in an average 5 ± 2 nm sized GdF3: 1% Nd3+colloidalNPs are 2000 times higher than efficient upconversion (UC) particles NaYF4: 20 % Er/ 2% Yb of same size. Furthermore, the utility of these NIR emitting nanoparticles forbioimagingprobe has been demonstrated by confocal imaging and spectroscopic study.
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发表时间: 2006-02
影响因子: 10.4
作者:
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影响因子: --
作者:
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