Enhanced Performances of Quantum Dot Light-Emitting Diodes with an Organic–Inorganic Hybrid Hole Injection Layer

• Published in: Crystals (Basel) Vol. 13; no. 6; p. 966
• Main Authors: Chen, Ling, Jiang, Donghuai, Du, Wenjing, Shang, Jifang, Li, Dongdong, Liu, Shaohui
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.06.2023
• Subjects: Contact resistance; Current efficiency; Efficiency; Electric properties; Glass substrates; hole injection layer; Lifetime; Light emitting diodes; light-emitting diode; Metal oxides; Morphology; Nanoparticles; Optical properties; Optoelectronic devices; Photovoltaic cells; quantum dot; Quantum dots; Spectrum analysis; Work functions; WOx-nanoparticle-doped PEDOT:PSS; China
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst13060966

PEDOT:PSS (polyethylene dioxythiophene:polystyrenesulfonate) is a commonly used hole injection layer (HIL) in optoelectronic devices due to its high conductive properties and work function. However, the acidic and hygroscopic nature of PEDOT:PSS can be problematic for device stability over time. To address this issue, in this study we demonstrated the potential of an organic–inorganic hybrid HIL by incorporating solution-processed WOx nanoparticles (WOx NPs) into the PEDOT:PSS mixture. This hybrid solution was found to have a superior hole transport ability and low Ohmic contact resistance contributing to higher brightness (~62,000 cd m−2) and current efficiency (13.1 cd A−1) in the manufactured quantum-dot-based light-emitting diodes (QLEDs). In addition, the resulting devices achieved a relative operational lifetime of 7071 h, or approximately twice that of traditional QLEDs with PEDOT:PSS HILs. The proposed method is an uncomplicated, reliable, and low-cost way to achieve long operational lifetimes without sacrificing efficiency in optoelectronic devices.