Open AccessStable angular emission spectra in white organic light-emitting diodes using graphene/PEDOT:PSS composite electrode
Author(s) -
Hyunsu Cho,
Hyunkoo Lee,
Jonghee Lee,
Woo Jin Sung,
ByoungHwa Kwon,
Chul-Woong Joo,
Junhwa Shin,
JunHan Han,
Jaehyun Moon,
Jeong Ik Lee,
Seungmin Cho,
Nam Sung Cho
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.009734
Subject(s) - pedot:pss , graphene , materials science , oled , electrode , optoelectronics , polystyrene sulfonate , composite number , poly(3,4 ethylenedioxythiophene) , optics , nanotechnology , composite material , layer (electronics) , chemistry , physics
In this work, we suggest a graphene/ poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) composite as a transparent electrode for stabilizing white emission of organic light-emitting diodes (OLEDs). Graphene/PEDOT:PSS composite electrodes have increased reflectance when compared to graphene itself, but their reflectance is still lower than that of ITO itself. Changes in the reflectance of the composite electrode have the advantage of suppressing the angular spectral distortion of white emission OLEDs and achieving an efficiency of 16.6% for white OLEDs, comparable to that achieved by graphene-only electrodes. By controlling the OLED structure to compensate for the two-beam interference effect, the CIE color coordinate change (Δxy) of OLEDs based on graphene/PEDOT:PSS composite electrodes is 0.018, less than that based on graphene-only electrode, i.e.,0.027.