Diluted PEDOT:PSS for high-performance organic light-emitting devices with thermally activated delayed fluorescence emitters

Authors：Fang, Hui; Chen, Xiaoyun; Lin, Jinliang; Li, Jiale; Xue, Qin^*; Xie, Guohua^*

Source：FARADAY DISCUSSIONS, 2023.

DOI：10.1039/d3fd00136a

• EFFICIENCY

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a widely used conductive polymer in organic light-emitting devices. However, its strong acidity and fluorescence quenching effect seriously affect the overall device performance. We report a cost-effective method to address the above concerns by diluting PEDOT:PSS with deionized water, which effectively reduced the film thickness and the acidity. Therefore, the fluorescence quenching occurring at the interface was alleviated. Using the modified PEDOT:PSS as the hole injection layer, the external quantum efficiency of the device could be effectively improved by a factor of 81%, reaching a considerably higher value of 23.5%, compared with the device consisting of the original PEDOT:PSS solution used as received. @@@ A cost-effective method to address the issues of strong acidity and exciton quenching of PEDOT:PSS was developed by diluting it with deionized water. The solution-processed organic LEDs achieved almost doubled efficiencies with the modified PEDOT:PSS.

• Institution
  厦门大学; 武汉大学