Cabanillas-Gonzalez Juan, Sciascia Calogero, Lanzani Guglielmo, Toffanin Stefano, Capelli Raffaella, Ramon Miguel C, Muccini Michele, Gierschner Johannes, Hwu Tsyr-Yuan, Wong Ken-Tsung
IFN-CNR, Dipartimento di Fisica, ULTRAS-INFM, Politecnico di Milano, Milano 20133, Italy.
J Phys Chem B. 2008 Sep 18;112(37):11605-9. doi: 10.1021/jp8044143. Epub 2008 Aug 20.
We report on the triplet spectra and dynamics in two types of oligomeric films deposited by two different techniques: thermal evaporation and spin coating. The different molecular arrangement in both films is manifested in a red shift of the absorption, PL, and T1-Tn absorption spectra of the sublimated film relative to the spin-coated one. Triplet recombination dynamics studied with steady-state photoinduced absorption (PA) spectroscopy follow a dispersive bimolecular recombination model away from the trap filling regime. We obtained values for the triplet bimolecular recombination ratio (beta) of 3.4 x 10 (-14) and 1.1 x 10 (-15) cm3 s (-1) for evaporated and spin-coated film, respectively, the difference being attributed to diverse molecular arrangement in both films.
热蒸发和旋涂。两种薄膜中不同的分子排列表现为升华薄膜相对于旋涂薄膜的吸收光谱、光致发光（PL）光谱和T1-Tn吸收光谱发生红移。用稳态光致吸收（PA）光谱研究的三线态复合动力学遵循远离陷阱填充区域的色散双分子复合模型。对于蒸发薄膜和旋涂薄膜，我们分别得到三线态双分子复合比（β）的值为3.4×10^(-14)和1.1×10^(-15) cm³ s^(-1)，这种差异归因于两种薄膜中不同的分子排列。
