Size-Dependent Optical Properties of Dendronized Perylenediimide Nanoparticle Prepared by Laser Ablation in Water
Size-Dependent Optical Properties of Dendronized Perylenediimide Nanoparticle Prepared by Laser Ablation in Water
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水中激光烧蚀制备的树枝化苝二酰亚胺纳米粒子的尺寸依赖性光学性质
DOI：
10.1143/jjap.48.065002
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发表时间：
2009
影响因子：
1.5
通讯作者：
T. Asahi
中科院分区：
文献类型：
--
作者：
R. Yasukuni;M. Sliwa;J. Hofkens;F. Schryver;A. Herrmann;K. Müllen;T. Asahi
采用激光烧蚀法在水中制备了树枝状苝二酰亚胺（DPDI）荧光纳米粒子。我们成功地制备了不同尺寸（150-400 nm）的胶体纳米粒子，并研究了它们的尺寸依赖性的光吸收和荧光特性。消光光谱的大小依赖于光散射损失的影响，可以解释，它被证实，它们的吸收光谱类似于在溶液中的分子。荧光光谱测量也证实了发色团间的相互作用很弱。另一方面，我们发现荧光量子产率随粒径的减小而减小，并提出了一种新的机制，在有机纳米粒子的发射强度的尺寸依赖性降低。基于DPDI荧光的尺寸依赖性荧光量子产率和溶剂极性依赖性，我们认为，当纳米颗粒中发色团间相互作用较弱时，激发单重态由于能量跳跃而在纳米颗粒中迁移并在表面猝灭，导致观察到的尺寸依赖性荧光量子产率（Φf）和纳米颗粒的Φf值小于非极性溶剂中的分子。
Fluorescent nanoparticles of dendronized perylenediimide (DPDI) were fabricated by laser ablation in water. We succeeded in the preparation of colloidal nanoparticles of different sizes (150–400 nm) and examined their size-dependent optical absorption and fluorescence properties. The size-dependent extinction spectra can be explained by the effect of light scattering loss, and it was confirmed that their absorption spectrum is similar to that of molecules in solution. The very weak interchromophoric interaction is also confirmed by fluorescence spectral measurement. On the other hand, we found that the fluorescence quantum yield decreases with decreasing of the particle size, and we propose a new mechanism for the size-dependent reduction of emission intensity in organic nanoparticles. On the basis of the size dependent-fluorescence quantum yield and solvent polarity dependence of DPDI fluorescence in organic solvents, we considered that, while the interchromophoric interactions are weak in the nanoparticle, the excited singlet state migrates in a nanoparticle owing to energy hopping and is quenched at the surface, leading to the observed size-dependent fluorescence quantum yield (Φf) and a smaller value of Φf for nanoparticles than for the molecules in nonpolar solvents.
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影响因子：
15
作者：
Dedecker, Peter;Hotta, Jun-Ichi;Hofkens, Johan
通讯作者：
Hofkens, Johan
DOI：
10.1007/s00339-008-4661-5
发表时间：
2008-06
期刊：
Applied Physics A
影响因子：
--
作者：
R. Yasukuni;T. Asahi;T. Sugiyama;Hiroshi Masuhara;Hiroshi Masuhara;Michel Sliwa;Johan Hofkens;F. Schryver;M. Auweraer;A. Herrmann;K. Müllen
通讯作者：
R. Yasukuni;T. Asahi;T. Sugiyama;Hiroshi Masuhara;Hiroshi Masuhara;Michel Sliwa;Johan Hofkens;F. Schryver;M. Auweraer;A. Herrmann;K. Müllen
影响因子：
1.6
作者：
T. Sugiyama;T. Asahi;H. Masuhara
通讯作者：
T. Sugiyama;T. Asahi;H. Masuhara
影响因子：
15
作者：
Flors, Cristina;Hotta, Jun-ichi;Hofkens, Johan
通讯作者：
Hofkens, Johan