Effect of Ir(pq)2acac doping on CBP in phosphorescence organic light-emitting diodes

Inyeob Na, Song Eun Lee, Min Kyu Joo, Il Hoo Park, Jae Ik Song, Hyunphil Joo, Young Kwan Kim, Gyu Tae Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Doping is one of the most powerful methods amongst the various performance improvement ways. Doping affects the energy levels of the host layer by the energy level of the dopant. This allows the energy bandgap to be adjusted to a desired level and thus generates light corresponding to that energy level. Alternatively, it can act as an energy barrier between the interfaces to change the flow of carriers. In this study, the voltage dependences of undoped and doped devices were observed. Bis(2-phenylquinoline) iridium(III) (acetylacetonate) (Ir(pq)2acac) was doped in 4,4′-N, N′-dicarbazole-biphenyl (CBP) as the emission layer. The light intensity changes with the doping concentration, and the efficiency was also studied. When a high voltage was applied, the effect of triplet-triplet annihilation (TTA) adversely affected the electron-hole recombination. We analyzed the optimal operating conditions and the effect of doping concentration on OLEDs.

Original languageEnglish
Pages (from-to)78-81
Number of pages4
JournalCurrent Applied Physics
Issue number1
Publication statusPublished - 2020 Jan

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2015R1A6A1A03031833 ), NRF grant funded by the Korea government (MSIP) ( 2019R1C1C1003467 ), and Nano-Material Technology Development Program through the NRF funded by Ministry of Science and ICT ( NRF-2017M3A7B4049119 ).

Publisher Copyright:
© 2019


  • 4,4′-N,N′-dicarbazole-biphenyl (CBP)
  • Doping
  • OLEDs
  • bis(2-phenylquinoline) iridium(III) (acetylacetonate) (Ir(pq)2(acac))

ASJC Scopus subject areas

  • General Materials Science
  • General Physics and Astronomy


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