Efficiency Enhancement Mechanisms in Tandem Organic Light-Emitting Devices Fabricated Utilizing a Mixed LCV: HAT-CN Layer Embedded Into a Charge Generation Layer
- Authors
- Koh, Eun Im; Kim, Dae Hun; Kim, Tae Whan
- Issue Date
- Oct-2015
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Charge Generation Layer; Tandem Organic Light-Emitting Device; Electrical Property; Optical Property
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.15, no.10, pp.8191 - 8194
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 15
- Number
- 10
- Start Page
- 8191
- End Page
- 8194
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/156261
- DOI
- 10.1166/jnn.2015.11262
- ISSN
- 1533-4880
- Abstract
- Tandem organic light-emitting devices (OLEDs) with a mixed organic n-type 4,4',4 ''-methylidynetris (N,N-dimethylaniline) and organic p-type 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile layer embedded into a charge generation layer (CGL) were fabricated to enhance their current efficiency. The operating voltage of the tandem OLEDs with a mixed layer at 10 mA/cm(2) was 1 V lower than that of the tandem OLEDs without a mixed layer due to the electrons generated from the mixed layer. The matrix-assisted laser desorption-ionization-time-of-flight mass spectrometer spectra clarified the charge generation behaviors of the mixed layer into the CGL. The current efficiency of the tandem OLEDs with a mixed layer at 10 mA/cm(2) was 48.2 cd/A, which was much larger than that without a mixed layer. The increase in the current efficiency for the tandem OLEDs was attributed to the enhancement of the electron injection efficiency in a CGL resulting from the insertion of the mixed layer.
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