MoO₃-induced oxidation doping of PEDOT:PSS for high performance full-solution-processed inverted quantum-dot light emitting diodes

Abstract

MoO3-induced oxidation in PEDOT:PSS hole contact enables improving its conductivity, work function and process compatibility for application in solution-processed transparent QD-LEDs, attaining a maximum luminous efficiency of 1.39 cd A−1and a transparency of >70%.

Interface dipole for remarkable efficiency enhancement in all-solution-processable transparent inverted quantum dot light-emitting diodes

“…The 5-nm thick s-MoO 3 layer assists the deposition of composite anode on the hydrophobic PVK layer (30 nm). 28 These functional layers were spin-coated via a layer-by-layer approach on the surface of the pre-patterned ITO/glass substrates. ZnO ETL was formed on ITO/glass by spin coating at a rotation speed of 2000 rpm for 40 s, following an annealing at 150°C for 10 min in the glove box.…”

“…27 However, deposition of the PEDOT:PSS-based composite upper anode had some process difficulties due to the poor wettability of the aqueous PEDOT:PSS on hydrophobic surface of the organic HTL. In a recent work, 28 we demonstrated that the use of solution-processed molybdenum trioxide (s-MoO 3 ) additive in the composite PEDOT:PSS/ AgNWs anode greatly improves its process wettability and contact quality at the QD emission layer/upper anode interface. It is shown that the addition of s-MoO 3 nanoparticles (NPs) not only alleviates the deposition difficulty of the upper composite anode but also enhances the hole injection at the QD emissive layer/upper anode interface.…”

“…[24][25][26] A combination of a metal oxide electron-transporting layer (ETL) and an organic hole-transporting layer (HTL), e.g., a pair of zinc oxide (ZnO)-modified front indium tin oxide (ITO) cathode and solution-processable AgNWs upper anode, has been adopted for application in QD-LEDs and OLEDs. 27,28 The efficient charge injections at the emissive layer/upper transparent anode and the emissive layer/front transparent cathode interfaces are two critical issues for attaining efficient operation of the light-emitting devices.…”

Transparent Conducting Electrodes for Quantum Dots Light Emitting Diodes

“…Lee et al . also reported on MoO 3 and PEDOT : PSS hybrid electrode for transparent inverted QDLEDs.…”

“…Lee et al [137] also reported on MoO 3 and PEDOT: PSS hybrid electrode for transparent inverted QDLEDs. The aqueous MoO 3 additive in conductive PEDOT: PSS improved the hole injection and wettability of the PEDOT: PSS surface.…”