Polymer light-emitting diodes with MoS2 and WS2 hole transport layers: enhanced efficiency and stability

Abstract

The integration of molybdenum disulfide (MoS2) and tungsten disulfide (WS2) as hole transport layers in polymer light-emitting diodes (PLEDs) is investigated using a wet-transfer method for deposition on indium tin oxide (ITO) substrates. Compared to conventional PEDOT:PSS/ITO anodes, WS2/ITO and MoS2/ITO devices exhibit enhanced performance, achieving maximum luminance values of 1212 cd/m2 and 873 cd/m2, respectively, exceeding the 721 cd/m2 of PEDOT:PSS/ITO. Current efficiencies reach 1.63 cd/A (WS2/ITO) and 1.35 cd/A (MoS2/ITO), surpassing the reference by factors of 2.04 and 1.69. Electroluminescence intensity enhancements of 9017c (WS2/ITO) and 6007c (MoS2/ITO) further highlight superior charge transfer and optical properties. These findings demonstrate the potential of MoS2 and WS2 as promising alternatives to PEDOT:PSS for efficient and stable PLEDs. (c) 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.