期刊
JOURNAL OF LUMINESCENCE
卷 128, 期 5-6, 页码 948-951出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2007.11.036
关键词
wire-type dendrimer; light harvesting; rapid energy transfer; poly-p-phenylenevinylene; oligophenylene
类别
Energy transfer and shielding effect are studied in wire-type dendrimers (GnPPV: nth generation dendrimer with poly-(p-phenylenevinylene) backbone; n= 1, 2) having oligophenylene light-harvesting (LH) antenna. Following the excitation of the LH-antennae, backbone-polymers in GnPPV give rise to intense photoluminescence (PL) bands. This is due to the presence of highly efficient energy transfer from the LH-antennae to the backbone-polymers. The intensity of backbone-PL increases faster than the decay of the antenna-PL. This result indicates that rapid energy transfer from antenna to backbone takes place utilizing the overlap of wavefunctions in the excited states. In G2PPV having larger LH-antenna, shielding effect against inter-backbone interactions is recognized more effectively than G1PPV. In solid films of GnPPV, red shifts of the backbone-PL bands are observed. This is caused by inter-backbone interactions of the wire-type dendrimers due to aggregation. The extent of the red shift in G2PPV is smaller than that of GIPPV. This result suggests that the larger LH-antenna in G2PPV substantially wraps its backbone-polymer and shields the inter-backbone interactions. (C) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据