White light emission from a polymer bilayer by incomplete cascade energy transfer

Jong Hyeok Park, O. Ok Park, Jai Kyeong Kim, Jae Woong Yu, Young Chul Kim

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3 Citations (Scopus)


White light emission was obtained from a light-emitting diodes (LEDs) prepared from an immiscible polymer blend consisting of poly(9,9′-dihexylfluorene-2,7-divinylene-m-phenylenevinylene-stat-p-phenylenevinylene) (PDHFPPV) and poly(2-methoxy-5-(2′-ethy-hexyloxy)-1,4-phenylenevinylene) (MEH-PPV). An inefficient energy transfer between PDHFPPV and MEH-PPV was observed because the blends are partially miscible. More importantly, because the order of bandgap energy is PVK > PDHFPPV > MEH-PPV we observed pure and strong white emission from this PLEDs, which results from the efficient Förster-type energy transfer from PVK to PDHFPPV and the partial energy transfer from PDHFPPV to MEH-PPV. The ITO/(PVK/immiscible blend)/Li:Al devices showed more enhanced white-light output compared with that of the ITO/(immiscible blend)/Li:Al device.

Original languageEnglish
Pages (from-to)640-643
Number of pages4
JournalCurrent Applied Physics
Issue number4
Publication statusPublished - 2006 Jul

Bibliographical note

Funding Information:
This research was supported by a grant(code #: 04K1501-01210) from “Center for Nanostructured Materials Technology” under “21st Century Frontier R&D Programs” of the Ministry of Science and Technology, Korea.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)


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