Emitting layer analysis of blue thermally activated delayed fluorescence devices using capacitance–voltage method

Soo Jong Park, Younguk Choi, Kwang Wook Choi, Seungwon Lee, Minjeong Choi, Jun Young Park, Jaewon Park, Soojin Kim, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this paper, blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have been elucidated, with a focus on the degradation characteristics of the emission layer (EML). The operational stability against electrical stress was investigated for two host materials and four doping concentrations, which were used as the EML. The operating stability of the devices was confirmed by comparing the peak capacitance before and after degradation. Devices using bis [2-(diphenyl-phosphino) phenyl] ether oxide (DPEPO) as a host exhibited poor degradation characteristics. However, high stability was confirmed when 3,3-di (9H-carba-zol-9-yl)-biphenyl (mCBP) was used. DPEPO host devices are most resistant against performance degradation when they are doped with 10 wt% 10,10'-(4,4′-sulfonylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine (DMAC-DPS). We successfully determined the electroluminescence characteristics of the device depending on the host material, as well as the doping concentration, using the capacitance–voltage method.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalCurrent Applied Physics
Publication statusPublished - 2021 Nov

Bibliographical note

Funding Information:
This work was supported by Samsung Display Co. Ltd. , and the Brain Korea 21 Plus Project in 2021 .

Publisher Copyright:
© 2021 Korean Physical Society


  • Capacitance–voltage
  • Degradation
  • Organic light-emitting diode
  • Thermally activated delayed fluorescence

ASJC Scopus subject areas

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


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