Highly Efficient Tandem White OLED Using a Hollow Structure

Kyung Hoon Han; Kwan Kim; Yoonjay Han; Yang Doo Kim; Hyoungcheol Lim; Daihong Huh; Hyun Shin; Heon Lee; Jang Joo Kim

doi:10.1002/admi.201901509

Highly Efficient Tandem White OLED Using a Hollow Structure

Kyung Hoon Han, Kwan Kim, Yoonjay Han, Yang Doo Kim, Hyoungcheol Lim, Daihong Huh, Hyun Shin, Heon Lee, Jang Joo Kim

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

19 Citations (Scopus)

Abstract

A simple fabrication method for a light extraction layer is required. In this report, an internal light extraction layer composed of a high refractive index material and an air void is fabricated in five steps. A direct printing process followed by annealing of the randomly arrayed poly(benzyl methacrylate) pillars after a planarization process using TiO₂-nanoparticle dispersed resist and sol is used. These substrates are used for light extraction in white tandem organic light emitting diodes (WOLEDs). By combining the hollow structure and hemi-spherical lens, WOLEDs without and with the light extraction structures are found to show maximum external quantum efficiencies of 35.6% and 103%, respectively. The power efficiencies at 100 cd m⁻² of the WOLEDs without and with the light extraction structures are found to be 26.5 and 93.2 lm W⁻¹, respectively. A color rendering index of 86.4, correlated color temperature of 4860 K, and CIE of (0.353, 0.389) are achieved in the WOLEDs with light extraction structures.

Original language	English
Article number	1901509
Journal	Advanced Materials Interfaces
Volume	7
Issue number	9
DOIs	https://doi.org/10.1002/admi.201901509
Publication status	Published - 2020 May 1

Bibliographical note

Funding Information:
K.‐H.H. and K.K. contributed equally to this work. This work was supported by the Industrial Strategic Technology Development Program (10048317) through the Korea Evaluation Institute of Industrial Technology (KEIT), Creative Materials Discovery Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT (NRF‐2018M3D1A1058972), and a Technology Innovation Program (20000887, Development of self‐healing impact‐resistant film coating material and process technology for rollable displays) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

high refractive index
light extraction efficiency
light scattering layers
nanoimprint lithography
organic light emitting diodes

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering

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10.1002/admi.201901509

Cite this

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title = "Highly Efficient Tandem White OLED Using a Hollow Structure",

abstract = "A simple fabrication method for a light extraction layer is required. In this report, an internal light extraction layer composed of a high refractive index material and an air void is fabricated in five steps. A direct printing process followed by annealing of the randomly arrayed poly(benzyl methacrylate) pillars after a planarization process using TiO2-nanoparticle dispersed resist and sol is used. These substrates are used for light extraction in white tandem organic light emitting diodes (WOLEDs). By combining the hollow structure and hemi-spherical lens, WOLEDs without and with the light extraction structures are found to show maximum external quantum efficiencies of 35.6% and 103%, respectively. The power efficiencies at 100 cd m−2 of the WOLEDs without and with the light extraction structures are found to be 26.5 and 93.2 lm W−1, respectively. A color rendering index of 86.4, correlated color temperature of 4860 K, and CIE of (0.353, 0.389) are achieved in the WOLEDs with light extraction structures.",

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note = "Funding Information: K.‐H.H. and K.K. contributed equally to this work. This work was supported by the Industrial Strategic Technology Development Program (10048317) through the Korea Evaluation Institute of Industrial Technology (KEIT), Creative Materials Discovery Program through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT (NRF‐2018M3D1A1058972), and a Technology Innovation Program (20000887, Development of self‐healing impact‐resistant film coating material and process technology for rollable displays) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). Publisher Copyright: {\textcopyright} 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Huh, Daihong

AU - Shin, Hyun

AU - Lee, Heon

AU - Kim, Jang Joo

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PY - 2020/5/1

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N2 - A simple fabrication method for a light extraction layer is required. In this report, an internal light extraction layer composed of a high refractive index material and an air void is fabricated in five steps. A direct printing process followed by annealing of the randomly arrayed poly(benzyl methacrylate) pillars after a planarization process using TiO2-nanoparticle dispersed resist and sol is used. These substrates are used for light extraction in white tandem organic light emitting diodes (WOLEDs). By combining the hollow structure and hemi-spherical lens, WOLEDs without and with the light extraction structures are found to show maximum external quantum efficiencies of 35.6% and 103%, respectively. The power efficiencies at 100 cd m−2 of the WOLEDs without and with the light extraction structures are found to be 26.5 and 93.2 lm W−1, respectively. A color rendering index of 86.4, correlated color temperature of 4860 K, and CIE of (0.353, 0.389) are achieved in the WOLEDs with light extraction structures.

AB - A simple fabrication method for a light extraction layer is required. In this report, an internal light extraction layer composed of a high refractive index material and an air void is fabricated in five steps. A direct printing process followed by annealing of the randomly arrayed poly(benzyl methacrylate) pillars after a planarization process using TiO2-nanoparticle dispersed resist and sol is used. These substrates are used for light extraction in white tandem organic light emitting diodes (WOLEDs). By combining the hollow structure and hemi-spherical lens, WOLEDs without and with the light extraction structures are found to show maximum external quantum efficiencies of 35.6% and 103%, respectively. The power efficiencies at 100 cd m−2 of the WOLEDs without and with the light extraction structures are found to be 26.5 and 93.2 lm W−1, respectively. A color rendering index of 86.4, correlated color temperature of 4860 K, and CIE of (0.353, 0.389) are achieved in the WOLEDs with light extraction structures.

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Highly Efficient Tandem White OLED Using a Hollow Structure

Abstract

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Keywords

ASJC Scopus subject areas

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