Optical Spectroscopy of Trap States in Amorphous Perylene Derivative Films

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• 作者：Harald Graaf ; Frank Friedriszik ; Christian Wagner ; Christian von Borczyskowski
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：April 28, 2011
• 年：2011
• 卷：115
• 期：16
• 页码：8150-8154
• 全文大小：798K
• 年卷期：v.115,no.16(April 28, 2011)
• ISSN：1932-7455

文摘

Emission spectra of amorphous thin films of chlorinated N,N鈥?dimethyl-perylene-tetra-carboxylic-acid-diimide (Cl₄MePTCDI) are characterized by two features: A small monomer emission and a further dominating and broad red-shifted peak. Temperature-dependent fluorescence and lifetime studies of the different excited states were carried out and led to the conclusion that the new state responsible for the red-shifted emission is populated via the excited monomeric state and vice versa. This new state can be understood as a trap caused by irregularities of the material, which can influence, for example, the twisting of the perylene core and therefore the energetics of the molecule.