Enhanced light extraction efficiency from organic light emitting diodes by insertion of a two-dimensional photonic crystal structure

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We studied the characteristics of organic light emitting diode (OLED) devices containing two-dimensional (2D) SiO2/SiNx photonic crystal (PC) layers. The finite-difference time-domain (FDTD) method was employed for the design and analysis of the PC OLED. Based on the design parameters derived from the FDTD calculations, a 2D PC layer was introduced on the glass substrate of a typical OLED structure by two-step irradiated hologram lithography and reactive ion etching. Experiments showed that incorporation of the PC layer improved the light extraction efficiency by over 50% compared to the conventional OLED, without noticeable degradation in electrical characteristics, under typical operating conditions. This improvement originates from the liberation of the photons trapped in the high-index guiding layers. (C) 2004 American Institute of Physics.
Publisher
AMER INST PHYSICS
Issue Date
2004-12
Language
English
Article Type
Article
Keywords

EXTERNAL-QUANTUM-EFFICIENCY; COUPLING EFFICIENCY; ELECTRON INJECTION; DEVICES; EMISSION; ELECTROLUMINESCENCE; POLYMERS; LAYER; OPTIMIZATION; MICROCAVITY

Citation

JOURNAL OF APPLIED PHYSICS, v.96, pp.7629 - 7636

ISSN
0021-8979
DOI
10.1063/1.1815049
URI
http://hdl.handle.net/10203/21787
Appears in Collection
PH-Journal Papers(저널논문)
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