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Updated: Jul 11, 2025
Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Diluted PEDOT:PSS for high-performance organic light-emitting devices with thermally activated delayed fluorescence
Hui Fang1,2, Xiaoyun Chen1,2, Jinliang Lin1,2
1The Institute of Flexible Electronics (Future Technologies), Xiamen University, Xiamen 361005, China. ifeghxie@xmu.edu.cn.
Abstract:
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.
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