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Efficiency enhancement of tandem organic light-emitting devices by a combined charge generation layer and organic n-type bis(ethylenedithio)-tetrathiafulvalene-doped electron transport layer
- Authors
- Cho, Jin Taek; Kim, Dae Hun; Koh, Eun Im; Kim, Tae Whan
- Issue Date
- Nov-2014
- Publisher
- Elsevier Sequoia
- Keywords
- Tandem organic light-emitting devices; Luminance efficiency; Electron transport layer
- Citation
- Thin Solid Films, v.570, pp 63 - 67
- Pages
- 5
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- Thin Solid Films
- Volume
- 570
- Start Page
- 63
- End Page
- 67
- ISSN
- 0040-6090
- Abstract
- While the operating voltage of the tandem organic light-emitting devices (OLEDs) with both an organic p-type 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile charge generation layer and a bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF)-doped 1,3,5-tris(N-phenylbenzimiazole-2-yl) benzene (TPBi) electron transport layer (ETL) was 1.3 V lower than that of the tandem OLEDs with a BEDT-TTF-undoped TPBi ETL. Luminance efficiency of the tandem OLEDs with a BEDT-TTF-doped TPBi ETL was 3.6 cd/A higher than that of the typical OLEDs. The increase in the luminance efficiency and the decrease in the operating voltage of the tandem OLEDs were attributed to improved electron injection due to the insertion of the BEDT-TTF-doped TPBi ETL.
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