Simplified thermally activated delayed fluorescence organic light-emitting diodes

Chan Hyuk Park, Yong Sub Shim, Cheol Hwee Park, Sun Gyu Jung, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Recently, after the first demonstration of efficient, thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs), these devices have been widely investigated, and several new materials (hole and electron transport materials) have been reported. In this work, we demonstrate highly efficient TADF OLEDs with a simplified structure, and systematically characterize these partially evaluated reported materials; (4s,6s)–2,4,5,6,–tetra(9H–carbazol–9–yl)isophthalonitrile (4CzIPN) has been used as a TADF emissive dopant; the exciton blocking and carrier transport characteristics of 9,9′–Diphenyl–6–(9–phenyl–9H–carbazol–3–yl)–9H,9′H–3,3′–bicarbazole (Tris-PCz) and 2,7–bis(2,2′–bipyridin–5–yl)triphenylene (BPy-TP2) have been characterized and compared with those of other widely used well-known organic materials. The demonstrated simplified TADF OLEDs with a 4CzIPN doped single emissive layer showed a high peak external quantum efficiency and power efficiency of 18.6% and 31.5 lm/W, respectively.

Original languageEnglish
Pages (from-to)233-238
Number of pages6
JournalOptical Materials
Publication statusPublished - 2018 Dec


  • 4CzIPN
  • Organic light-emitting diodes
  • Simplified structure
  • Thermally activated delayed fluorescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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