Fluorescence Energy Transfer study on PFO/Polythiophene Blends

• Main Authors: Shin-Yu Lio, 劉信佑
• Other Authors: Su-Hua Chen
• Format: Others
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/eya9k8

碩士 === 國立東華大學 === 材料科學與工程學系 === 102 === Conjugated polymer series (conjugated polymers) for multi-crystalline materials, their optical and electrical properties are often subject to the crystal structure and phase changes. This study investigated the correlation in the process of blending the conjugated polymer fluorescence energy transfer with phase change. Blending system of the donor in blue-ray of poly(9,9-di-n-octyl- 2,7-fluorene) (PFO) the receptor (the acceptor) of the three samples are red poly thiophene derivatives series, namely poly (3-hexylthiophene-2,5-diyl) (P3HT) and poly (3,3 ''-didodecyl quarter thiophene (PQT). The donor (PFO) metastable β phase ,crystallization of the α phase, and the liquid crystal nematic phase ,using spin coating blends receptor concentration of 20% of the film samples, through the control rate measurement of the heating and cooling temperature fluorescence spectroscopy to observe the PFO occurrence of phase changes as the temperature changes ,the efficiency of the PFO different fluorescence energy transfer to the receptor poly thiophene derivatives. PFO/P3HT blended series, choose a different temperature range to explore the effect of changing temperature. The other groups of experiments in order to verify that the reproducibility fluorescence energy transfer relationship with the phase change, and test the impact of changes in the donor chemical structure of the PFO / PQT (90/10) ▫ The results showed that the three blended system are displayed the PFO β-phase fluorescent energy transfer efficiency (about 90%) is best, blended spectra show the orange light (luminescence donor).The nematic liquid crystal phase of the fluorescence energy transfer efficiency (50%) followed by. Both light-emitting donor and acceptor.Crystalline phase almost no fluorescence energy transfer (<10%), blended the blue-ray fluorescence spectroscopy is almost only PFO hair. Inferred that the structure of the molecular arrangement rules the higher, the more difficult the occurrence of the phenomenon of energy transfer. The temperature changes had no significant effect on the fluorescence energy transfer. In addition, the PQT blending system appeared superior to the P3HT in luminous efficiency, even if only a small amount of energy transfer, such as crystalline phase or liquid crystalline phase. Keywords: fluorescence energy transfer、congugated polymers 、 dornor、acceptor。