Energy transfer dynamics in wire-type dendrimers having oligophenylene peripheries

Energy transfer and shielding effect are studied in wire-type dendrimers (GnPPV: n-th 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 G1PPV. This result suggests that the larger LH-antenna in G2PPV substantially wraps its backbone-polymer and shields the inter-backbone interactions

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京都大学0048新制・課程博士博士(人間・環境学)甲第8457号人博第87号11||155(吉田南総合図書館)新制||人||22(附属図書館)UT51-2000-F361京都大学大学院人間・環境学研究科人間・環境学専攻(主査)教授 山内 淳, 教授 後藤 喬雄, 助教授 馬場 正昭学位規則第4条第1項該当Doctor of Human and Environmental StudiesKyoto UniversityDA