A morphological study of random nanostructured external light extraction layers for enhancing optical characteristics of OLEDs

This study presents an in-depth investigation of nano-pillar-based external light extraction techniques, focusing on the analysis of light extraction characteristics based on the pillar and plane structures. The nano-pillar-based external light extraction structure is formed by a process technology...

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Veröffentlicht in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2023-10, Vol.11 (41), p.1437-14315
Hauptverfasser: Choi, Geun Su, Kang, Shin Woo, Bae, Eun Jeong, Ju, Byeong-Kwon, Park, Young Wook
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Sprache:eng
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Zusammenfassung:This study presents an in-depth investigation of nano-pillar-based external light extraction techniques, focusing on the analysis of light extraction characteristics based on the pillar and plane structures. The nano-pillar-based external light extraction structure is formed by a process technology that allows for the formation and control of the plane thickness. In this study, a random nanostructure layer based on SU-8 was fabricated, and the impact of variations in the overall height and plane height on the light extraction efficiency of the organic light-emitting diode (OLED) was analyzed. The nanostructure layer was easily formed using a low-temperature mask-free process, enabling control of diffraction and scattering effects in the visible wavelength range. The research results demonstrate that the fabricated nanostructure layer exhibited a total transmittance of over 85% in the visible spectrum, with higher light extraction efficiency observed as the thickness of the plane structure approached zero. Furthermore, compared to OLEDs without the random nano-pillar structure (RNPS), the external quantum efficiency and power efficiency were improved by up to 37.5% and 40.4%, respectively. These findings provide valuable insights into the design and optimization strategies for random nano-pillar-based external light extraction structures, contributing to the advancement of OLED technology. This study presents an in-depth investigation of nano-pillar-based external light extraction techniques, focusing on the analysis of light extraction characteristics based on the pillar and plane structures.
ISSN:2050-7526
2050-7534
DOI:10.1039/d3tc02334f