| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014) | |
| Thin Films | Monday Sessions |
| Session TF-MoE |
| Session: | Electronics and Displays on Flexible and Hard Substrates |
| Presenter: | Chang-Lyoul Lee, Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), Republic of Korea |
| Authors: | C.-L. Lee, Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), Republic of Korea N.C. Greenham, Cavendish Laboratory, Unversity of Cambridge, UK S.-H. Han, Mokpo National Maritime Unversity, Republic of Korea W.-E. Lee, Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), Republic of Korea G. Kwak, Kyungpook National University, Republic of Korea |
| Correspondent: | Click to Email |
In this talk, I will introduce two topics. One is polymer photovoltaic devices and the other is sensor for detecting biomolecules (or heavy metal ions) and pattering application of conjugated polyelectolyte through in-situ electrostatic self-assembly.
The roll of triplet states in photovoltaic devices (PV) is less studied than in PLEDs. Recent studies show that utilization of triplet excitons in conjugated polymer improves PV device performance. The triplet exciton dynamics of conjugated polymer in phosphorescent dye blended polymer PV device was investigated by photo-induced absorption (PIA) spectroscopy. From the low temperature PIA experiments of phosphorescent dye blended conjugated polymer films, the origin of the enhancement of triplet exciton population of conjugated polymer was revealed. And also, the PIA and PV response studies of phosphorescent dye blended conjugated polymer : fullerene bulk heterojuction PV device as well as phosphorescent dye blended conjugated polymer : fullerene bilayer PV device reveal the photo-physical interaction among the conjugated polymer, phosphorescent dye and fullerene and effects of triplet excitons to the PV device performance. (Adv. Funct. Mater.,20, 2945, 2010).
The second section of this talk is senor and pattering application of conjugated polyelectolyte (CPE). Conjugated polyelectrolyte (CPE) with new signal transduction mechanism, based on sulfonated poly(diphenylacetylene), was developed. The CPE showed relatively weak FL emission in water due to a highly dense stack degree of side phenyl rings, while the stack structure was consistently relaxed by being combined with proteins, showing a great PL amplification. Consequently, the CPE was highly responsive to even a little amount of proteins because each of numerous side phenyl rings act as FL probes. (Chem. Commun., 49, 9857, 2013).
A new method for patterning conjugated polymer (CP) by in-situ electrostatic self-assembly (ESA) of conjugated polyelectrolyte (CPE) with surfactants in a film was reported. The in-situ ESA was simply realized by contacting the film to appropriate surfactant solutions. The contacting parts on the CPE film have completely different solubility from the non-contacting parts; the polymer chains in the contacted part also undergo supramolecular rearrangement, consequently resulting in dramatic PL emission enhancement. The optical and structural properties of the contacted part were regulated by varying the alkyl tail length of the surfactants employed. Highly resolved CP patterns can be readily obtained through this in-situ ESA approach. (unpublished results)