Molecular orientation and the interaction between metal-organic interfaces probed by in situ nonliniear spectroscopy

利用可见光波长可调谐的和频产生（SFG）振动光谱研究了埋地有机界面和有机发光二极管（OLED）界面。在有机发光材料界面中，我们发现在有机功能材料/金属界面处，金属与有机材料之间形成电荷转移态。将双谐振SFG技术应用于OLED器件，成功地探测了多层OLED器件在工作过程中埋藏的有机层。我们还使用双谐振SFG光谱对PCBM: P3HT表面及其热退火效果进行了表征。我们发现，通过热退火，在表面扩展了&#61552；

We investigated buried organic interfaces and the organic light emitting diode (OLED) interfaces using sum-frequency generation (SFG) vibrational spectroscopy with visible wavelength tunability. In the organic light emitting material interfaces, we found that charge transfer state between the metal and the organic materials were formed at the organic functional material/ metal interfaces. By applying the doubly resonant SFG technique to the OLED devices, we succeed to probe the buried organic layers in the multi-layered OLED device during operation. We also performed the characterization of the PCBM: P3HT surfaces and their thermal annealing effect using doubly-resonant SFG spectroscopy. We found that the extent of the -conjugation length are expanded at the surface by the thermal annealing.