A dodecanethiol-functionalized Ag nanoparticle-modified ITO anode for efficient performance of organic light-emitting devices

Abstract

The electroluminescence intensity of a dodecanethiol-functionalized silver (DT-Ag) NP/CPB:Ir(mpidmb)₂(acac) film was increased by about 2.23 times in comparison with that of a control device, CPB:Ir(mpidmb)₂(acac), due to coupling between excitons of emissive layer and the localized surface plasmon resonance (LSPR) of DT-Ag NPs. The current efficiency of a device with a DT-Ag NPs layer at 100 cd cm⁻² (42.3 cd A⁻¹) was 17.0 cd A⁻¹ higher than that of the control device (25.3 cd A⁻¹). The increase in current efficiency in the case of DT-Ag NP-coated devices was strongly related to the energy transfer between radiated light generated from the CBP:Ir(mpidmb)₂(acac) emissive layer and the LSPR excited by the DT-Ag NPs layer.