Enhanced Driving Performance of Organic Light-Emitting Diodes with All Carrier Ohmic-Contacts
- Authors
- Lim, JT[Lim, Jong Tae]; Kwon, JW[Kwon, Jae Wook]; Yeom, GY[Yeom, Geun Young]
- Issue Date
- 2011
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.158, no.2, pp.J10 - J14
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 158
- Number
- 2
- Start Page
- J10
- End Page
- J14
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/71546
- DOI
- 10.1149/1.3519846
- ISSN
- 0013-4651
- Abstract
- This paper elucidates the enhancement of the optoelectronic properties of organic light-emitting diodes (OLEDs) by the p-doping effect of molybdenum oxide (MoO(x))-doped 4,4',4 ''-tris[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA). The device performance strongly depends on both the thickness and the doping concentration of the MoO(x)-doped 2-TNATA. As the doping concentration is increased from 25 to 75%, the hole ohmic properties of the hole-only device with the glass/indium tin oxide (ITO)/MoO(x)-doped 2-TNATA (100 nm)/Al structure were improved, due to the increase in the p-type doping effect. Also, the photoemission spectra revealed that the p-type doping effects cause the lowering of the hole-injecting barrier height, as well as the improvement of the hole conductivity. This improvement is caused by the formation of the charge transfer complex (MoO(x)(-)/2-TNATA(+)) that is generated by doping MoO(x) into 2-TNATA, markedly increasing the number of hole carriers. With MoO(x)-doped 2-TNATA as a hole ohmic contact and fullerene (C(60))/lithium fluoride (LiF) as an electron ohmic contact, the OLED with the glass/ITO/MoO(x)-doped 2-TNATA (75%, 60 nm)/NPB (10 nm)/Alq(3) (35 nm)/C(60) (5 nm)/LiF (1 nm)/Al (150nm) structure showed both a maximum luminance of 127,600 cd/m(2) at 6.4 V and power efficiency of 4.7 lm/W at about 1000 cd/m(2). (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3519846] All rights reserved.
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Collections - Engineering > School of Advanced Materials Science and Engineering > 1. Journal Articles
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