Random nanostructure scattering layer for suppression of microcavity effect and light extraction in OLEDs

In this study, we investigated the effect of a random nanostructure scattering layer (RSL) on the microcavity and light extraction in organic light emitting diodes (OLEDs). In the case of the conventional OLED, the optical properties change with the thickness of the hole transporting layer (HTL) bec...

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Bibliographic Details
Published in:Optics letters 2014-06, Vol.39 (12), p.3527-3530
Main Authors: Shin, Jin-Wook, Cho, Doo-Hee, Moon, Jaehyun, Joo, Chul Woong, Lee, Jonghee, Huh, Jin Woo, Park, Seung Koo, Han, Jun-Han, Cho, Nam Sung, Hwang, Joohyun, Chu, Hye Yong, Lee, Jeong-Ik
Format: Article
Language:English
Subjects:
Color
Extraction
Luminous efficacy
Microcavities
Nanostructure
Organic light emitting diodes
Scattering
Transporting
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Summary:In this study, we investigated the effect of a random nanostructure scattering layer (RSL) on the microcavity and light extraction in organic light emitting diodes (OLEDs). In the case of the conventional OLED, the optical properties change with the thickness of the hole transporting layer (HTL) because of the presence of a microcavity. However, OLEDs equipped with the an RSL showed similar values of external quantum efficiency and luminous efficacy regardless of the HTL thickness. These phenomena can be understood by the scattering effect because of the RSL, which suppresses the microcavity effect and extracts the light confined in the device. Moreover, OLEDs with the RSL led to reduced spectrum and color changes with the viewing angle.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.39.003527