Multispectral electroluminescence enhancement of single-walled carbon nanotubes coupled to periodic nanodisk arrays

Abstract

The integration of periodic nanodisk arrays into the channel of a light-emitting field-effect transistor leads to enhanced and directional electroluminescence from thin films of purified semiconducting single-walled carbon nanotubes. The maximum enhancement wavelength is tunable across the near-infrared and is directly linked to the periodicity of the arrays. Numerical calculations confirm the role of increased local electric fields in the observed emission modification. Large current densities are easily achieved due to the high charge carrier mobilities of carbon nanotubes and will facilitate new electrically driven plasmonic devices.

Near‐Infrared‐II Molecular Dyes for Cancer Imaging and Surgery

“…[1,2] Such a highly sensitive imaging technique allows for investigating However, the lack of applicable fluorophores with both high quantum efficiency and biocompatibility causes a dominant barrier on the way to the extensive endorsement of NIR-II bioimaging in clinical using. Many inorganic and carbon-based nanomaterials, such as single-wall carbon nanotubes, [16,[21][22][23][24][25][26] quantum dots, [17,[27][28][29][30][31][32][33][34][35] and rare-earth nanoparticles, [36][37][38][39][40][41][42] have been developed as NIR-II fluorophores up to present, which bring safety issues with regard to immune uptake and clearance after imaging. Organic fluorophores afford an exceptional alternative, as their fluorescence properties can be controlled by rational chemical structure design, and there are considerable advantages on the subject of biocompatibility and biosafety.…”

Recent Developments and Novel Applications of Thin Film, Light‐Emitting Transistors

“…It must be replaced with a nonmetallic gate material, e.g., the conducting polymer poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) (see Figure e,f) to avoid drastic changes of the refractive index within the stack. The resulting emission from an LEFET with an integrated plasmonic crystal of gold nanodiscs is enhanced and follows the angular distribution given by the far‐field coupling of the lattice (Figure g) …”

Radiative Pumping and Propagation of Plexcitons in Diffractive Plasmonic Crystals

“…The latter are supported in plasmonic crystals formed by the diffractive coupling of periodically arranged gold nanodisks or nanorods. Semiconducting single-walled carbon nanotubes are used owing to their advantageous properties to strong coupling regime, , and the ability of easy electrical exciton generation and electric field gating. , By implementing their in-plane orientation and an indirect radiative pumping scheme, we eliminate spatial variation imposed by the excitation source and directly visualize the propagation of plexcitons via their radiative decay. Through extensive analysis of the theoretical and experimental two-dimensional band-structure, we are able to reconstruct a complex set of anisotropic features such as plexciton group velocity (≤200 μm/ps), effective mass (≥10 –7 of electron mass) and spatial coherence length (≤20 μm).…”

“…Apart from the variation of lifetime, the nanoparticle shape and size played only a minor role in the plexciton state dispersion. The high compatibility of our system with electrical excitation, , and the robustness of strong light-matter coupling in carbon nanotubes at high current densities opens pathways for the realization of ultrafast active plasmonic devices and low-power/energy optoelectronic components.…”