TY - JOUR
T1 - Highly Efficient Tandem White OLED Using a Hollow Structure
AU - Han, Kyung Hoon
AU - Kim, Kwan
AU - Han, Yoonjay
AU - Kim, Yang Doo
AU - Lim, Hyoungcheol
AU - Huh, Daihong
AU - Shin, Hyun
AU - Lee, Heon
AU - Kim, Jang Joo
N1 - 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
PY - 2020/5/1
Y1 - 2020/5/1
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.
KW - high refractive index
KW - light extraction efficiency
KW - light scattering layers
KW - nanoimprint lithography
KW - organic light emitting diodes
UR - http://www.scopus.com/inward/record.url?scp=85081332176&partnerID=8YFLogxK
U2 - 10.1002/admi.201901509
DO - 10.1002/admi.201901509
M3 - Article
AN - SCOPUS:85081332176
SN - 2196-7350
VL - 7
JO - Advanced Materials Interfaces
JF - Advanced Materials Interfaces
IS - 9
M1 - 1901509
ER -