Figure 4. Light densities of OLEDs with commercial PEDOT:PSS (blue curve), OLEDs with self-made PEDOT:PSS (orange curve) and OLEDs without PEDOT:PSS (grey curve) at different voltages

From

Teaching Organic Electronics - Part II: Quick & Easy Synthesis of the (Semi-)Conductive Polymer PEDOT: PSS in a Snap-Cap Vial

Amitabh Banerji, Stephan Kirchmeyer, Klaus Meerholz, Fabian Scharinger

World Journal of Chemical Education. 2019, 7(2), 166-171 doi:10.12691/wjce-7-2-16