We report a broad photoluminescence (PL) band of poly (3,4ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) ranging from 1.2 to 3.0 eV over the full range of the visible region. Comparison with the PL of related materials reveals that the origin of the observed PL of PEDOT/PSS is PSS. This study indicates that the removal of excess PSS improves the optical properties of PEDOT/PSS for application as transparent electrodes.
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