Bi-layer hole-injecting layer composed of molybdenum oxide and polyelectrolyte for solution-processed OLEDs with prolonged stability. Issue 102 (21st October 2016)

• Record Type: Journal Article
• Authors: Peng, Jinghong; Xu, Xinjun; Yao, Chuang; Li, Lidong
• Is Part Of: RSC advances. Volume 6:Issue 102(2016)
• Page Start: 100312
• Page End: 100317
• Publication Date: 2016-10-21
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra21705b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Bi-layer hole-injecting layer composed of molybdenum oxide and polyelectrolyte was used for efficient and stable solution processed OLEDs. Abstract : Currently, poly(3, 4-ethylene-dioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS) is predominantly used as the hole-injecting layer in solution processed organic light-emitting diodes (OLEDs). However, its strong acidity is detrimental to device stability. Here, a bi-layer hole-injecting layer (BHIL) composed of molybdenum trioxide (MoO3 ) and an anionic polyelectrolyte has been used in solution processed OLEDs to replace PEDOT:PSS. The MoO3 layer was firstly solution deposited using low temperature combustion processing, which ensured that the device had a good hole-transporting ability. Then, an anionic polyelectrolyte was deposited on to the MoO3 layer also using a solution process, resulting in work function increase which was verified using peak force Kelvin probe force microscopy. Thus, the hole-injecting ability of the BHIL was found to be enhanced. It was found that BHIL-based OLEDs possessed a comparable electroluminescence performance but a better shelf-stability relative to the PEDOT:PSS based devices. This strategy gives a promising approach to obtaining high performance solution processed OLEDs with long-term stability.