Improved out-coupling efficiency of organic light emitting diodes fabricated on a TiO2 planarization layer with embedded Si oxide nanostructures

Young Hoon Sung; Pil Hoon Jung; Kyung Hoon Han; Yang Doo Kim; Jang Joo Kim; Heon Lee

doi:10.1016/j.optmat.2017.04.003

Improved out-coupling efficiency of organic light emitting diodes fabricated on a TiO₂ planarization layer with embedded Si oxide nanostructures

Young Hoon Sung
, Pil Hoon Jung
, Kyung Hoon Han
, Yang Doo Kim
, Jang Joo Kim
, Heon Lee^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

In order to increase the out-coupling efficiency of organic light emitting diodes, conical Si oxide nanostructures were formed on a glass substrate using nanoimprint lithography with hydrogen silsesquioxane. Then, the substrate was planarized with TiO₂ nanoparticles. Since TiO₂ nanoparticles have a higher refractive index than Si oxide, the surface of substrate is physically flat, but optically undulated in a manner that enables optical scattering and suppression of total internal reflection. Subsequently, OLEDs formed on a substrate with nanostructured Si oxide and a TiO₂ planarization layer exhibit a 25% increase in out-coupling efficiency by suppressing total internal reflection.

Original language	English
Pages (from-to)	828-832
Number of pages	5
Journal	Optical Materials
Volume	72
DOIs	https://doi.org/10.1016/j.optmat.2017.04.003
Publication status	Published - 2017 Oct

Bibliographical note

Funding Information:
This research was supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning ( NRF-2013M3C1A3063597 ). This work was supported by the National Research Foundation of Korea grant funded by the Korea government(MSIP) ( 2016R1A2B3015400 ). This research was supported by LG Innotek KoreaUniversity Nano-Photonics Program.

Publisher Copyright:
© 2017

Keywords

Light extraction
Nanoimprint
OLED
Refractive index
TiO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Computer Science
Atomic and Molecular Physics, and Optics
Spectroscopy
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Electrical and Electronic Engineering

Access to Document

10.1016/j.optmat.2017.04.003

Cite this

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title = "Improved out-coupling efficiency of organic light emitting diodes fabricated on a TiO2 planarization layer with embedded Si oxide nanostructures",

abstract = "In order to increase the out-coupling efficiency of organic light emitting diodes, conical Si oxide nanostructures were formed on a glass substrate using nanoimprint lithography with hydrogen silsesquioxane. Then, the substrate was planarized with TiO2 nanoparticles. Since TiO2 nanoparticles have a higher refractive index than Si oxide, the surface of substrate is physically flat, but optically undulated in a manner that enables optical scattering and suppression of total internal reflection. Subsequently, OLEDs formed on a substrate with nanostructured Si oxide and a TiO2 planarization layer exhibit a 25\% increase in out-coupling efficiency by suppressing total internal reflection.",

keywords = "Light extraction, Nanoimprint, OLED, Refractive index, TiO",

author = "Sung, \{Young Hoon\} and Jung, \{Pil Hoon\} and Han, \{Kyung Hoon\} and Kim, \{Yang Doo\} and Kim, \{Jang Joo\} and Heon Lee",

note = "Funding Information: This research was supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning ( NRF-2013M3C1A3063597 ). This work was supported by the National Research Foundation of Korea grant funded by the Korea government(MSIP) ( 2016R1A2B3015400 ). This research was supported by LG Innotek KoreaUniversity Nano-Photonics Program. Publisher Copyright: {\textcopyright} 2017",

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doi = "10.1016/j.optmat.2017.04.003",

language = "English",

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AU - Sung, Young Hoon

AU - Jung, Pil Hoon

AU - Han, Kyung Hoon

AU - Kim, Yang Doo

AU - Kim, Jang Joo

AU - Lee, Heon

N1 - Funding Information: This research was supported by the Pioneer Research Center Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning ( NRF-2013M3C1A3063597 ). This work was supported by the National Research Foundation of Korea grant funded by the Korea government(MSIP) ( 2016R1A2B3015400 ). This research was supported by LG Innotek KoreaUniversity Nano-Photonics Program. Publisher Copyright: © 2017

PY - 2017/10

Y1 - 2017/10

N2 - In order to increase the out-coupling efficiency of organic light emitting diodes, conical Si oxide nanostructures were formed on a glass substrate using nanoimprint lithography with hydrogen silsesquioxane. Then, the substrate was planarized with TiO2 nanoparticles. Since TiO2 nanoparticles have a higher refractive index than Si oxide, the surface of substrate is physically flat, but optically undulated in a manner that enables optical scattering and suppression of total internal reflection. Subsequently, OLEDs formed on a substrate with nanostructured Si oxide and a TiO2 planarization layer exhibit a 25% increase in out-coupling efficiency by suppressing total internal reflection.

AB - In order to increase the out-coupling efficiency of organic light emitting diodes, conical Si oxide nanostructures were formed on a glass substrate using nanoimprint lithography with hydrogen silsesquioxane. Then, the substrate was planarized with TiO2 nanoparticles. Since TiO2 nanoparticles have a higher refractive index than Si oxide, the surface of substrate is physically flat, but optically undulated in a manner that enables optical scattering and suppression of total internal reflection. Subsequently, OLEDs formed on a substrate with nanostructured Si oxide and a TiO2 planarization layer exhibit a 25% increase in out-coupling efficiency by suppressing total internal reflection.

KW - Light extraction

KW - Nanoimprint

KW - OLED

KW - Refractive index

KW - TiO

UR - https://www.scopus.com/pages/publications/85028763993

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JO - Optical Materials

JF - Optical Materials

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