Palacios Rodrigo E, Barbara Paul F
Department of Chemistry and Biochemistry and the Center for Nano- and Molecular Science and Technology, University of Texas, Austin, TX 78712, USA.
J Fluoresc. 2007 Nov;17(6):749-57. doi: 10.1007/s10895-007-0186-0. Epub 2007 Apr 25.
We report on the spectroscopy of isolated chains of P3OT, in a highly dilute solution in the inert polymer host poly(methyl-methacrylate) (PMMA). This environment permits a detailed analysis of emission transitions in the 1.9-2.2 eV range by suppressing the formation of the lowest emitting-energy aggregated form of P3OT. Herein it is observed that the 1.9-2.2 eV band is in fact split into low (red) and high (blue) energy forms in a highly analogous situation to that found for the conjugated polymer MEH-PPV. Another focus of this work is an investigation of the interaction of singlet and triplet excitons in P3OT. The results indicate that, like in MEH-PPV, triplet excitons are highly efficient fluorescence quenchers for P3OT, strongly quenching the fluorescence of P3OT under even relatively low excitation intensities.
我们报道了在惰性聚合物主体聚甲基丙烯酸甲酯（PMMA）的高度稀释溶液中P3OT孤立链的光谱。这种环境通过抑制P3OT最低发射能量聚集形式的形成，允许对1.9 - 2.2 eV范围内的发射跃迁进行详细分析。在此观察到，1.9 - 2.2 eV波段实际上分裂为低（红）能和高（蓝）能形式，这与共轭聚合物MEH - PPV的情况非常相似。这项工作的另一个重点是研究P3OT中单重态和三重态激子的相互作用。结果表明，与MEH - PPV一样，三重态激子是P3OT高效的荧光猝灭剂，即使在相对较低的激发强度下也能强烈猝灭P3OT的荧光。
