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Nanoshuttered OLEDs: Unveiled Invisible Auxiliary Electrode
Author(s) -
Shim Yong Sub,
Hwang Ju Hyun,
Lee Hyun Jun,
Choi Kyung Bok,
Kim Kyu Nyun,
Park Cheol Hwee,
Jung SunGyu,
Park Young Wook,
Ju ByeongKwon
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201401253
Subject(s) - materials science , oled , indium tin oxide , optoelectronics , electrode , substrate (aquarium) , grating , sheet resistance , layer (electronics) , diode , anode , nanotechnology , chemistry , oceanography , geology
In this study, organic light‐emitting diodes (OLEDs) with enhanced optical properties are fabricated by inserting a nanosized stripe auxiliary electrode layer (nSAEL) between the substrate and an indium tin oxide (ITO) layer. This design can avoid the shortcomings of conventional microsized layers while maintaining high optical uniformity due to the improved conductivity of the electrode. The primary advantage is that the nSAEL (submicrometer scale) is no longer visible to the naked eye. Moreover, the reflective shuttered (grating) structure of the nSAEL increases the forward‐directed light by the microcavity (MC) effect and minimizes the loss of light by the extracting the surface plasmon polariton (SPP) mode. In this study, the degree of the MC and SPP can be controlled with the parameters of the nSAEL by simply conjugating the conditions of laser interference lithography (LIL). Therefore, the current and power efficiencies of the device with an nSAEL with optimized parameters are 1.17 and 1.23 times higher than the reference device at 1000 cd/m 2 , respectively, and at these parameters, the overall sheet resistance is reduced to less than half (48%). All of the processes are verified by comparing the computational simulation results and the experimental results obtained with the actual fabricated device.