Carrier transport mechanisms in organic light-emitting devices with a N,N '-diphenyl-N,N '-bis(1-naphthyl)-1,1 '-biphenyl-4,4 '-diamine : tris-(8-hydroxyquinoline) aluminum mixed layer acting as an emitting layer
- Authors
- Yoon, Yong-Beum; Choo, Dong Chul; Lee, Dea Uk; Kim, Tate Whan; Kwack, Kae Dal; Kim, Jun-ho; Seo, Jeongheon; Kim, Youngkwan
- Issue Date
- Nov-2006
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- carrier transport mechanism; mixed layer; organic light-emitting devices
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.458, pp.273 - 279
- Indexed
- SCIE
SCOPUS
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 458
- Start Page
- 273
- End Page
- 279
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/180806
- DOI
- 10.1080/15421400600932173
- ISSN
- 1542-1406
- Abstract
- The current density-voltage (J-V) measurements on organic light-emitting devices (OLEDs) with and without a N,N'-diphenyl-N,N'-bis(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (NPB):tris-(8-hydroxyquinoline) aluminum (Alq(3)) mixed layer were performed to investigate the carrier transport mechanism. The slopes of the double logarithmic J-V curves for the OLEDs with and without the mixed layer in the space-charge-limited current (SCLC) region were 6.5 and 2, respectively. The dramatic increase in the slope of the double logarithmic J-V curve for the OLEDs with the mixed layer was attributed to the decrease in the mobility difference of the charge carriers at the NPB/Alq(3) heterointerface resulting from the minimization of the energy barriers, and the carrier transport behaviors in the SCLC region were significantly affected by the unintentional virtual electrode, serving as a charge carrier reservoir, that formed at the heterointerface.
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