Simplified thermally activated delayed fluorescence organic light-emitting diodes
- Authors
- Park, Chan Hyuk; Shim, Yong Sub; Park, Cheol Hwee; Jung, Sun-Gyu; Park, Young Wook; Ju, Byeong-Kwon
- Issue Date
- 12월-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Organic light-emitting diodes; Thermally activated delayed fluorescence; 4CzIPN; Simplified structure
- Citation
- OPTICAL MATERIALS, v.86, pp.233 - 238
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICAL MATERIALS
- Volume
- 86
- Start Page
- 233
- End Page
- 238
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/71354
- DOI
- 10.1016/j.optmat.2018.10.002
- ISSN
- 0925-3467
- Abstract
- 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-ypisophthalonitrile (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 wellknown 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.
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