Luminous efficiency enhancement in blue phosphorescent organic light-emitting diodes with an electron confinement layers
- Authors
- Kang, Jin Sung; Yoon, Ju-An; Yoo, Seung Il; Kim, Jin Wook; Yi, Seungjun; Zhu, Furong; Cheah, Kok Wai; Kim, Woo Young
- Issue Date
- 9월-2015
- Publisher
- ELSEVIER
- Keywords
- Blue phosphorescent OLED; Hole confinement layer (HCL); Electron confinement layer (ECL).; Luminous efficiency; External quantum efficiency
- Citation
- OPTICAL MATERIALS, v.47, pp.78 - 82
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICAL MATERIALS
- Volume
- 47
- Start Page
- 78
- End Page
- 82
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92545
- DOI
- 10.1016/j.optmat.2015.07.003
- ISSN
- 0925-3467
- Abstract
- This study reports the results of blue phosphorescent organic light emitting diodes (PHOLEDs) employing an electron confinement layer (ECL), tris-(phenylpyrazole)iridium (Ir(ppz)(3)) and a hole confinement layer (HCI), 1,3,5-tris(N-phenylbenzimiazole-2-yl)benzene (TABi). The electrical and optical characteristics of PHOLEDs with different emissive layers, including current density, luminance, and luminous efficiency, were analyzed. The thickness of the individual emissive layer was optimized, however, and the total thickness of the emitting region was kept constant at 300 A. This work reveals that the effective electron confinement, due to a large energy level offset between the electron confinement and emitting layers, helps to improve hole-electron current balance in the emitting region. The maximum external quantum efficiency of 23.40% at 1500 cd/m(2) was achieved for PHOLEDs with an ECL, which-is 60% higher than the structural identical control device without ECL. (C) 2015 Elsevier B.V. All rights reserved.
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