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Journal Article Efficient Large-Area Transparent OLEDs Based on a Laminated Top Electrode with an Embedded Auxiliary Mesh
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Authors
Sunghee Park, Jong Tae Lim, Won-Yong Jin, Hyunkoo Lee, Byoung-Hwa Kwon, Nam Sung Cho, Jun-Han Han, Jae-Wook Kang, Seunghyup Yoo, Jeong-Ik Lee
Issue Date
2017-05
Citation
ACS Photonics, v.4, no.5, pp.1114-1122
ISSN
2330-4022
Publisher
American Chemical Society(ACS)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1021/acsphotonics.6b00942
Project Code
16MB1100, The core technology development of light and space adaptable energy-saving I/O (Input/Output) platform for future advertising service, Hwang Chi-Sun
Abstract
To realize transparent organic light-emitting diodes (OLEDs), a top electrode should have excellent optical, electrical, and mechanical properties. Conventionally, transparent conductive oxides and semitransparent metal have been widely used for transparent top electrodes, but they have several fundamental drawbacks. We herein report efficient large-area inverted transparent OLEDs using a vacuum-laminated top electrode with an embedded metal mesh. The laminated device with 1 mm pitch exhibits superior optical properties including a high transmittance of 75.9% at 550 nm, a low reflectance of 12.0% at 550 nm, and spectrally flat characteristics over the entire visible region and shows nearly ideal Lambertian angular emission characteristics with little angular color shift in both directions. Moreover, the lowered sheet resistance of 4 廓/sq originating from the embedded metal mesh (1 mm pitch) led to efficient and uniform emission characteristics. As a result, the device shows a relatively high maximum current efficiency of 50.3 cd/A (bottom: 24.5 cd/A; top: 25.8 cd/A) and a maximum external quantum efficiency of 15.3% (bottom: 7.9%; top: 7.4%), which surpasses all previously reported values based on a laminated top electrode. In addition, we successfully demonstrate its potential as a large-area transparent top electrode in various optoelectronic devices through a large-area transparent OLED segment panel (45 × 90 mm2, diagonal length of 70.2 mm in the active area) with a laminated top electrode.
KSP Keywords
2 mm, Active area, Diagonal length, Embedded metal mesh, External Quantum Efficiency, High transmittance, Maximum current, Mechanical properties(PMCs), Organic light-emitting diodes(OLEDS), Visible region, current efficiency