Properties of blue polymer light emitting diodes according to the doping concentrations of firpic phosphorescence

Su Cheol Gong, Hyung Ho Park, Hyeongtag Jeon, Ho Jung Chang

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1 Citation (Scopus)


PFO [poly(9,9-dioctylfluorene-2-7-diyl) end capped with N,N-Bis(4-methylphenyl)- 4-aniline] based blue polymer light emitting diodes (PLEDs) that use a FIrpic [iridium(III) bis[4,6-(difluorophenyl) pyridinato-N,C20 picolinate] phosphorescent dopant as an emission layer were fabricated using a host-dopant system in order to achieve high luminance and efficiency properties. To find the optimum doping concentration, the FIrpic was doped at various concentrations, ranging from 1 to 4 wt%, into the PFO host. Blue phosphorescence PLEDs with the structure of ITO/PEDOT:PSS/PFO:FIrpic/TPBI/ LiF/Al were prepared. The electrical and optical properties were investigated and compared in the prepared PLED devices with and without the FIrpic dopant. The luminance and the current efficiency were improved by introducing the FIrpic dopant. For the PLED device with a 2 wt% FIrpic concentration, the maximum luminance and current efficiency was found to be 4128 cd/m2 and 0.92 cd/A, respectively. The CIE color coordinates was (x, y = 0.19, 0.28), exhibiting a sky-blue color.

Original languageEnglish
Pages (from-to)14-23
Number of pages10
JournalMolecular Crystals and Liquid Crystals
Publication statusPublished - 2011

Bibliographical note

Funding Information:
This work was supported by a Korea Research Foundation Grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund) (KRF-2008-314-D00211).

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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