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Researchers develop low-cost sol'n polymer LEDs, PV cells

Posted: 23 Jul 2013 ?? ?Print Version ?Bookmark and Share

Keywords:polymer LED? solar cell? plasmonic material? polymer-based optoelectronic device?

The material prepared by the UNIST research team is easy to synthesise with basic equipment and has low-temperature solution processability, they stated. This low-temperature solution processability enables roll-to-roll mass production techniques and is suitable for printed electronic devices.

"Our work is significant also because it anticipates the realisation of electrically driven laser devices by utilising carbon dot-supported silver nanoparticles (CD-Ag NPs) as plasmonic materials." indicated said Byeong-Su Kim, professor at UNIST. "The material allows significant radiative emission and additional light absorption, leading to remarkably enhanced current efficiency."

Surface plasmon resonance is an electro-magnetic wave propagating along the surface of a thin metal layer and the collective oscillation of electrons in a solid or liquid stimulated by incident light. SPR is the basis of many standard tools for measuring adsorption of materials onto planar metal (typically gold and silver) surfaces or onto the surface of metal nanoparticles.

The team demonstrated efficient PLEDs and PSCs using surface plasmon resonance enhancement with CD-Ag NPs. The PLEDs achieved a remarkably high current efficiency (from 11.65-27.16cd A-1) and luminous efficiency (LE) (from 6.33-18.54lmW-1).

PSCs produced in this way showed enhanced power conversion efficiency (PCE) (from 7.53-8.31 per cent) and internal quantum efficiency (IQE) (from 91-99 per cent at 460nm). The LE (18.54lmW-1) and IQE (99 per cent) are among the highest values reported to date in fluorescent PLEDs and PSCs, respectively.

"These significant improvements in device efficiency demonstrate that surface plasmon resonance materials constitute a versatile and effective route for achieving high performance polymer LEDs and polymer solar cells," said Jin Young Kim, professor at UNIST. "This approach shows promise as a route for the realisation of electrically driven polymer lasers."

The fellow researchers include Hyosung Choi, Seo-Jin Ko, Yuri Choi, Taehyo Kim, Boram Lee and Myung Hoon Song from UNIST, and researchers from Chungnam National University, Pusan National University, and Gwangju Institute of Science and Technology.

This research was supported by a World Class University (WCU) programme through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology, the National Research Foundation of Korea Grant, the Korea Healthcare technology R&D Project, the Ministry of Health & Welfare, Korea and the International Cooperation of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government Ministry of Knowledge Economy.


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