Investigation of the localized surface plasmon resonance of Ag@SiO₂ core-shell nanocubes and its application in high-performance blue organic light-emitting diodes

Abstract

A blue organic light-emitting diode (OLED) with silica-coated silver nanocubes (Ag@SiO 2 NCs) inserted at the hole transporting layer/emission layer interface is reported. The localized surface plasmon resonance (LSPR) properties of the Ag@SiO 2 NCs were characterized by the measured absorption spectra, stable-stated and transient photoluminescence, and calculated dipole radiation power. The results suggest that the Ag NCs significantly improved the radiation intensity of the nearby excitons due to their sharp corners and edges, but had less impact on the radiation rate of the excitons. The exciton recombination zone in the blue OLED was confirmed by a group of devices with an ultra-thin yellow emission layer located at different places, which helped to figure out the distribution of the excitons around the Ag@SiO 2 NCs and deeply understand the coupling between the excitons and the Ag@SiO 2 NCs. In our blue OLED, an appropriate distance between the Ag NCs and the excitons was realized by the SiO 2 coating layer and the exciton distribution, which greatly improved the energy transfer between the excitons and the Ag NCs. In addition, the LSPR enhanced electric field around the Ag@SiO 2 NCs improved the carrier injection at the hole transporting layer/ emission layer interface and increased the current density of the blue OLED. Finally, the blue OLED with a simple triple layer structure achieved a high current efficiency of 51.1 cd A −1 .

Enhancing the Light Output‐Coupling of Inverted Top‐Emitting Organic Light‐Emitting Diodes by Using the Localized Surface Plasmon Resonance of Ag Nanoparticles

“…At the LSPR wavelength, the AgNPs exhibit near-field enhancement of electromagnetic fields that improves the light output-coupling. [39][40][41] In addition to the function of enhancing light extraction, MoO x in the LOCL can effectively isolate water and oxygen to achieve a good packaging effect.…”

Non-toxic near-infrared light-emitting diodes

“…The past decade has witnessed a significant rise in LSPR enhancement of visible OLEDs with noble metal (Au or Ag) nanostructures resulting in 20–60% improvement in efficiency ( Deng et al., 2019 ; Wu et al., 2018 ; Munkhbat et al., 2016 ). Noble metal nanostructures are promising thanks to their unique physical and chemical properties, efficient dispersibility in solvents for solution processing, and moderate costs of production.…”

Copper Nanoparticles Enhancing Organic Light-Emitting Diodes of All Colors

“…Huang et al reported that silver nanoparticles were doped to enhance the luminescence . These enhancements may be attributed to the surface plasmon resonance (SPR) effect as the NPs interact with the incident light. − , However, owing to their intrinsically narrow SPR bands peaking at around 520 nm, none have yet reported any significant improvement for devices in the red or near-infrared red (NIR) region, even with the employment of their mixtures, − alloys, or surface modified counterparts. , …”

“…[25][26][27][28][29][30]46 However, owing to their intrinsically narrow SPR bands peaking at around 520 nm, 33 none have yet reported any significant improvement for devices in the red or near-infrared red (NIR) region, even with the employment of their mixtures, 34−36 alloys, 37 or surface modified counterparts. 43,45 Nanocopper particles possesses unique properties that make them useful in a wide range of applications. Due to their small size and high surface area, they exhibit high reactivity and efficiency in catalytic and electrochemical reactions.…”