微结构约束下Rubrene（001）晶体表面的激子动力学
Exciton Dynamics on Rubrene (001) Crystal Surfaces with Microstructure Confinement
摘要：
利用具有微米空间分辨率的时间分辨光致发光技术，比较了红荧烯（001）平面晶体表面和受限金字塔结构下的激子动力学。的发光光谱可以解释的自由和自陷激子的产生。它们的比例取决于显着的结构尺寸，我们解释的金字塔结合激子扩散常数的光吸收曲线。对于后者的下限为0.2厘米2/秒，在4 K已被估计。依赖于温度的衰减时间揭示3毫电子伏和14毫电子伏的自由和自陷激子之间的激活势垒。
英文摘要：
The exciton dynamics on flat (001) rubrene crystal surfaces have been compared with those under confined pyramidal geometry by time-resolved photoluminescence with micrometer spatial resolution. The luminescence spectra can be interpreted in terms of generation of a free and a self-trapped exciton. Their ratio depends significantly on the structural size which we explain by the optical absorption profile of the pyramids in combination with the exciton diffusion constant. For the latter a lower limit of 0.2 cm2/s at 4 K has been estimated. Temperature-dependent decay times reveal activation barriers between free and self-trapped exciton of 3 meV and 14 meV.
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