Highly efficient and stable organic light-emitting diode by balancing drift current of charge
- Authors
- Park, Ho-Cheol; Park, Jong-Wook; Oh, Seong-Geun
- Issue Date
- Jul-2010
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- OLED; WOLED; Balancing drift current; Life-time; OLED device
- Citation
- CURRENT APPLIED PHYSICS, v.10, no.4, pp.1103 - 1107
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 10
- Number
- 4
- Start Page
- 1103
- End Page
- 1107
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/174499
- DOI
- 10.1016/j.cap.2010.01.005
- ISSN
- 1567-1739
- Abstract
- Highly efficient and stable OLED device in which hole-drift current and electron-drift current are balanced was fabricated. Drift current characteristics according to the thickness of organic layer were examined using the device with ITO/m-MTDATA/NPB/Al structure that can only move the hole and the device with Al/LiF/Alq(3)/LiF/Al structure that can only move the electron. Using the result of such examination, green device with balanced drift current was produced. Device with the structure of m-MTDATA (80 nm)/NPB (20 nm)/C-545T (3%) doped Alq(3) (5 nm)/Alq(3) (59 nm)/LiF (1 nm)/Al (200 nm) showed color purity of (0.309, 0.643) and high efficiency of 7.0 lm/W (14.4 cd/A). Most of light emission was observed inside the green emitting layer. Through the result of EL spectrum for the device also including red emitting layer, same result could be obtained. The device with balanced drift current also showed half lifetime of 175 h for initial luminance of 3000 cd/m(2), which is more stable in comparison to the device without balanced drift current.
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