The creation of light-harvesting antenna complexes offers numerous potential applications in the field of optoelectronics. Cesium lead halide nanocrystals, specifically, are beginning to show great promise for optoelectronic applications due to their thermal stability and bright luminescence. As per the majority of all colloidally stable nanocrystals, they process surface-bound ligands that offer stability and surface state passivation. By replacing these ligands with organic chromophores various energy interactions can be observed, leading to a greater variety of potential applications. In this paper, we show enhanced emission in red and orange perylene diimide organic dye ligands through the transfer of energy harvested by CsPbBr 3 nanocrystals. This has been demonstrated via steady-state and time-resolved fluorescence measurements and has a great potential for spectral management through energy-transfer interactions in hybrid light-harvesting systems. We estimate the Forster resonance energy-transfer efficiencies of up to 65 and 45% for perylene orange ligand surface loadings of 0.25 nm −2 and perylene red ligand surface loadings 0.12 nm −2 , respectively.
Cesium
lead halide perovskite nanocrystals show great promise for
optoelectronic applications due to their thermal stability, wide absorption
range, and intense photoluminescence. These properties make CsPbX3 (X = Cl, Br, or I) nanocrystals great potential candidates
for incorporation into light harvesting antenna complexes and photon
multipliers via the coordination of organic chromophores as surface-bound
ligands. In this paper, we demonstrate the synthesis of CsPbBr3 and CsPbI3 NCs and direct in situ attachment of anthracene-9-carboxylic acid ligands to their surface.
Using steady-state and time-resolved fluorescence measurements, we
show that CsPbX3–anthracene systems demonstrate
energy transfer from the anthracene ligands via FRET with efficiencies
as high as 40%.
The lighting industry currently accounts for a significant proportion of all energy demand. Luminescent white lighting is often impure, inefficient, expensive, and detrimentally emits as a point source, meaning the light is emitted from a focused point. A luminescent light diffuser offers the potential to create a spatially broad lighting fixture. We developed a luminescent light diffuser consisting of three commercially available luminescent dye species (rhodamine 6G, fluorescein, 7‐diethylamino‐4‐methylcoumarin) dispersed within a polymer matrix (polyvinyl alcohol), or commercial paint, and coated on a planar waveguide. A Light‐emitting diode (LED) (385 nm) is directed into the waveguide which excites the luminescent species, coating the panel, creating a device that emits spatially broad pure white light. As the emission depends on escape cone emission from the waveguide, the device’s emission was found to depend highly on the coating film quality and components. We present two systems: a small 40 mm × 40 mm prototype, made using standard water‐soluble polymer (polyvinyl alcohol), to study the underlying operational principles, and a 100 mm
× 100 mm device with optimized efficiency fabricated with a clear commercial paint. By doping the polymer matrix with scattering silica microparticles we achieved a maximum photon outcoupling efficiency of 78%, whilst maintaining colour purity with an increased device size of more than 300 times (compared with the input LED). This work shows that it is possible to construct an inexpensive and spatially broad lighting source, whilst maintaining colour purity at a low cost.
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