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Journal Article Correlation between optimized thicknesses of capping layer and thin metal electrode for efficient top‐emitting blue organic light‐emitting diodes
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Authors
Hyunsu Cho, Chul Woong Joo, Byoung-Hwa Kwon, Chan-mo Kang, Sukyung Choi, Jin Wook Sin
Issue Date
2023-12
Citation
ETRI Journal, v.45, no.6, pp.1056-1064
ISSN
1225-6463
Publisher
한국전자통신연구원
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.4218/etrij.2022-0236
Abstract
The optical properties of the materials composing organic light‐emitting diodes (OLEDs) are considered when designing the optical structure of OLEDs. Optical design is related to the optical properties, such as the efficiency, emission spectra, and color coordinates of OLED devices because of the microcavity effect in top‐emitting OLEDs. In this study, the properties of top‐emitting blue OLEDs were optimized by adjusting the thicknesses of the thin metal layer and capping layer (CPL). Deep blue emission was achieved in an OLED structure with a second cavity length, even when the transmittance of the thin metal layer was high. The thin metal film thickness ranges applicable to OLEDs with a second microcavity structure are wide. Instead, the thickness of the thin metal layer determines the optimized thickness of the CPL for high efficiency. A thinner metal layer means that higher efficiency can be obtained in OLED devices with a second microcavity structure. In addition, OLEDs with a thinner metal layer showed less color change as a function of the viewing angle.
KSP Keywords
Blue OLEDs, Capping layer, Cavity length, Deep blue, Emission spectra, Emitting diodes, Film thickness, Higher efficiency, Microcavity effect, OLED devices, Optical Design
This work is distributed under the term of Korea Open Government License (KOGL)
(Type 4: : Type 1 + Commercial Use Prohibition+Change Prohibition)
Type 4: