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We Want Our Photons Back: Simple Nanostructures for White Organic Light‐Emitting Diode Outcoupling
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- Authors
- Yong Hyun Kim, Jonghee Lee, Won Mok Kim, Cornelius Fuchs, Simone Hofmann, Hong-Wei Chang, Malte C. Gather, Lars Muller-Meskamp, Karl Leo
- Issue Date
- 2014-05
- Citation
- Advanced Functional Materials, v.24, no.17, pp.2553-2559
- ISSN
- 1616-301X
- Publisher
- John Wiley & Sons
- Language
- English
- Type
- Journal Article
- Abstract
- Conventional planar organic light-emitting diodes (OLEDs) suffer from poor light extraction due to the total internal reflection at the waveguided interfaces. Therefore, the development of efficient light extraction structures is of great necessity and significance to realize practical applications in large area and cost-effective light sources. In this paper, a high-performance internal light outcoupling system for white OLEDs with spontaneously formed metal oxide nanostructures is developed. The fabrication process of the outcoupling system is simple and can be scaled to large area manufacturing. The enhancement of external quantum efficiency in white OLEDs comprising the outcoupling system reaches a factor of 1.7, and it is further increased to 2.9 when a hemispherical lens is employed. Together with the improvement of light extraction, excellent color stability over broad viewing angles is achieved. Conventional planar OLEDs suffer from poor light extraction due to the total internal reflection at internal interfaces. In this paper, a high-performance internal light outcoupling system for white OLEDs with spontaneously formed metal oxide nanostructures is developed. In addition to the huge improvement of light extraction, the novel nanostructures lead to excellent color stability over broad viewing angles. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- KSP Keywords
- Co. KGaA, Color stability, External Quantum Efficiency, Fabrication process, High performance, Internal interface, Light source, Metal oxide nanostructures, Metal-oxide(MOX), conventional planar, cost-effective