Size-Dependent Spectroscopic Properties of Conjugated Polymer Nanoparticles

详细信息    查看全文

• 作者：John K. Grey ; Doo Young Kim ; Brent C. Norris ; William L. Miller ; Paul F. Barbara
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：December 28, 2006
• 年：2006
• 卷：110
• 期：51
• 页码：25568 - 25572
• 全文大小：144K
• 年卷期：v.110,no.51(December 28, 2006)
• ISSN：1520-5207

文摘

This paper is focused on how the spectroscopic properties of conjugated polymers evolve in the size rangebetween single polymer chains and the bulk material. The measurements used single-particle spectroscopytechniques and include both static and dynamic measurements. The main observation of this work is that thespectroscopic properties of MEH-PPV evolve rapidly as a function of nanoparticle size and achieve bulk-likeproperties for nanoparticles greater than 10 nm in size. Nanoparticles were assembled by a reprecipitationtechnique and characterized by fluorescence emission spectroscopy. The physical origin of the size-dependentspectroscopic properties is assigned to the distance dependence of four main processes: electronic energytransfer between blue and red sites, triplet-triplet annihilation, singlet exciton quenching by triplets, andsinglet exciton quenching by hole polarons.