| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 102 === Polymer blending is practiced frequently for the fabrication of PLEDs. The optical properties may be enhanced or modified by blending a luminescent conjugated polymer with another material, either a photonically inert polymer due to the dilution effect, or another luminescent conjugated polymer. In this research, a supramolecular polymer with photoluminescence, poly[9,9-dioctyl-2,7-fluorene-alt-2,5-(3-hexyl- sulfonylthiophene)](PFOT) was used to blend with another nonluminescent polymer.
PFOT is a conjugated alternating copolymer which is derived from fluorene and thiophene. The fluorene moiety spans the entire visible range owing to the rigid coplanar structure and sufficient conjugation of double bonds while the thiophene moiety affords good film-forming, strong absorption, and high hole-transporting properties.
First of all, various solutions and films with different concentrations of PFOT were prepared and characterized. The results reveal that phase separation in solid state is worse than in solution state due to the increased aggregation. For this reason, blending PFOT with another nonluminescent polymer such as PC was conducted in order to make progress on optical properties of solid film. Through the variations of doping amount, spin speed of coating processes, and being separated by four kinds of matrices, it was found that the introduction of photonically inert polymer could reduce interchain interactions which improve the optical properties of thin film. Especially with EVA, the blending film yielded up to 6 times the photoluminescence of the neat PFOT film.
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