Abstract
We report on the enhanced conductivity of the benzoic-acid-treated poly(3,4-ethlenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) electrode for use in highly flexible, organic light-emitting devices (OLEDs). The conductivity of the benzoic-acid-treated PEDOT:PSS electrode increased from 1 to 1583.2 S/cm, in comparison with that of the pristine PEDOT:PSS electrode, due to a complex factor of the H+ mole % and the dielectric constant of the benzoic solution. Among the post-treatment methods of the PEDOT:PSS electrodes, the operating voltage at 1000 cd/m2 of OLEDs fabricated utilizing the PEDOT:PSS electrode with the benzoic acid treatment has the lowest value, and its maximum luminance is 24,400 cd/m2, which are 1.54 and 2.15 times higher than those of OLEDs using PEDOT:PSS electrodes treated with dimethyl sulfoxide and methanol, respectively. The luminance of a flexible OLED with a benzoic-acid-treated PEDOT:PSS electrode after 1400 bending cycles decreased to 83% of the initial luminance, resulting in excellent mechanical stability.
Highlights
We report on the enhanced conductivity of the benzoic-acid-treated poly(3,4-ethlenedioxythiophe ne):poly(styrene sulfonate) (PEDOT:PSS) electrode for use in highly flexible, organic light-emitting devices (OLEDs)
The conductivities of PEDOT:PSS with benzoic acid treatment are enhanced in comparison with the Scientific Reports | (2021) 11:3885 |
We report on the conductivity enhancement in the PEDOT:PSS electrode with benzoic acid treatment for application in highly efficient, flexible OLEDs
Summary
We report on the enhanced conductivity of the benzoic-acid-treated poly(3,4-ethlenedioxythiophe ne):poly(styrene sulfonate) (PEDOT:PSS) electrode for use in highly flexible, organic light-emitting devices (OLEDs). The post treatment of PEDOT:PSS electrode including organic s olvent25,26, zwitterions27, salt[28] or a cid[29,30,31] have been reported as alternative to enhance conductivity. The conductivity of the sulfuric acid treated PEDOT:PSS electrode was reported to be increased more than 3200 S/cm[32]. The sulfuric acid, a strong acid that can damage the flexible devices, is not suitable for use as materials to enhance conductivity of PEDOT:PSS e lectrode[33]. It is necessary to consider mechanisms and process methods that can further improve conductivity of PEDOT:PSS electrode though the weak acid treatment. The external quantum efficiency of the flexible OLEDs with the weak acid treatment has almost the same external quantum efficiency as the OLEDs using the ITO electrode
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