Luminance Enhancement Mechanisms for Blue Organic Light-Emitting Devices Utilizing a Double Emitting Layer
- Authors
- Bang, Hyun Sung; Choo, Dong Chul; Kim, Tae-Won
- Issue Date
- Aug-2011
- Publisher
- ELECTROCHEMICAL SOC INC
- Keywords
- anodes; brightness; buffer layers; doping; electron-hole recombination; fluorescence; light emitting devices; organic compounds
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.158, no.10, pp.J291 - J293
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 158
- Number
- 10
- Start Page
- J291
- End Page
- J293
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/167823
- DOI
- 10.1149/1.3615977
- ISSN
- 0013-4651
- Abstract
- Blue organic light-emitting devices (OLEDs) were fabricated utilizing fluorescent materials of 2-methyl-9,10-bis(naphthalene-2-yl)anthracene (MADN), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthorlene (BCP), and 1,3-bis(carbazol-9-yl)benzene (mCP). The emitting layer (EML) of the blue OLEDs consisting of a hole buffer layer and a blue fluorescent layer provided the efficient formation of the electron-hole pairs. The maximum luminance of the OLEDs with a BCP-doped MADN/MADN-doped mCP double EML at 10 V was 10,270 cd/m(2), which was much larger than that of blue OLEDs with a single EML. The holes injected from the indium-tin-oxide anode were accumulated at the BCP-doped MADN/MADN-doped mCP and the MADN-doped mCP/BCP heterointerfaces, resulting in the generation of the Coulomb force. The maximum luminance of the blue OLEDs with a double EML significantly increased due to an increase in the recombination rate of the electrons and holes resulting from the existence of the hole-induced Coulomb force.
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