Abstract：The crystallization properties of the perylene (EPPTC) molecules doped in the solid film of the derivative of polyfluorene (F8BT) at different annealing temperatures, as well as the consequently induced spectroscopic response of the exciplex emission in the heterojunction structures, were studied in the present paper. Experimental results showed that the phase separation between the small and the polymer molecules in the blend film is enhanced with increasing the annealing temperature, which leads to the crystallization of the EPPTC molecules due to the strong π—π stacking. The size of the crystal phase increases with increasing the annealing temperature. However, this process weakens the mechanisms of the heterojunction configuration, thus, the total interfacial area between the small and the polymer molecules and the amount of exciplex are reduced significantly in the blend film. Meanwhile, the energy transfer from the polymer to the small molecules is also reduced. As a result, the emission from the exciplex becomes weaker with increasing the annealing temperature, whereas the stronger emission from the polymer molecules and from the crystal phase of the small molecules can be observed. These experimental results are very important for understanding and tailoring the organic heterojunction structures. Furthermore, this provides photophysics for improving the performance of photovoltaic or solar cell devices.
尹 名，张新平*，刘红梅. 退火温度对高分子薄膜中掺杂小分子的结晶和光谱学响应特性的影响[J]. 光谱学与光谱分析, 2012, 32(11): 3078-3082.
YIN Ming, ZHANG Xin-ping*, LIU Hong-mei. Effect of Annealing Temperature on the Crystallization and Spectroscopic Response of a Small-Molecule Semiconductor Doped in Polymer Film . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(11): 3078-3082.
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