Karl Börjesson
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View article: Entering the Strong Coupling Regime in Conventional Organic Solar Cells
Entering the Strong Coupling Regime in Conventional Organic Solar Cells Open
Organic solar cells offer a promising method to convert light into fossil‐free energy, yet their performance still cannot compete with their silicon counterparts. Recently, strong exciton‐photon coupling has been shown to enhance the prope…
View article: Quantitative Modeling of Polaritonic Emission Using the Source Term Method
Quantitative Modeling of Polaritonic Emission Using the Source Term Method Open
Strong exciton-photon coupling leads to the formation of hybrid states, polaritons, with properties different from those of their constituents, making it a valuable tool for modifying the physical and chemical properties of organic and ino…
View article: Excitation-Dependent K<sup>+</sup> Sensing by Combining Photoinduced Electron Transfer and Triplet–Triplet Annihilation
Excitation-Dependent K<sup>+</sup> Sensing by Combining Photoinduced Electron Transfer and Triplet–Triplet Annihilation Open
Triplet-triplet annihilation photon upconversion (TTA-UC) combines the energy of two photons to provide one of higher energy. Detecting such high energy photons can be more selective than conventional fluorescence, because artifacts like s…
View article: Role of Vibrational-Assisted Scattering and Surface-Enhanced Raman Scattering in Colloidal Plexcitonic Materials
Role of Vibrational-Assisted Scattering and Surface-Enhanced Raman Scattering in Colloidal Plexcitonic Materials Open
Strong coupling between excitons and an electromagnetic mode leads to the formation of polaritonic materials. These half-light half-matter states obey Bose-Einstein statistics and have therefore promised a route toward room temperature con…
View article: Diamondiyne: A 3D carbon allotrope with mixed valence hybridization
Diamondiyne: A 3D carbon allotrope with mixed valence hybridization Open
Carbon is arguably the most versatile element in the periodic table. It can form bonds to other elements in one-, two- and three-dimensions, allowing the formation of structurally and electronically diverse materials. Carbon allotropes, ma…
View article: The effect of the oxidation level of the graphene oxide substrate on <i>in situ</i> growth of COF-300
The effect of the oxidation level of the graphene oxide substrate on <i>in situ</i> growth of COF-300 Open
A graphene oxide covalent organic framework composite was made. The surface modification of graphene oxide enables covalent bonds between two materials, and the oxidation level of graphene oxide directs the COF morphology.
View article: Separating triplet exciton diffusion from triplet–triplet annihilation by the introduction of a mediator
Separating triplet exciton diffusion from triplet–triplet annihilation by the introduction of a mediator Open
The functions of triplet diffusion and annihilation are seperated into two different molecules by using triplet triplet annihilation between two diffrenet molecular species, allowing for photon upconversion at low annihilator concentration…
View article: Lowering of the singlet-triplet energy gap via intramolecular exciton-exciton coupling
Lowering of the singlet-triplet energy gap via intramolecular exciton-exciton coupling Open
Organic dyes typically have electronically excited states of both singlet and triplet multiplicity. Controlling the energy difference between these states is a key factor for making efficient organic light emitting diodes and triplet sensi…
View article: Deuteration as a General Strategy to Enhance Azobenzene‐Based Photopharmacology
Deuteration as a General Strategy to Enhance Azobenzene‐Based Photopharmacology Open
Chemical photoswitches have become a widely used approach for the remote control of biological functions with spatiotemporal precision. Several molecular scaffolds have been implemented to improve photoswitch characteristics, ranging from …
View article: Deuteration as a General Strategy to Enhance Azobenzene‐Based Photopharmacology
Deuteration as a General Strategy to Enhance Azobenzene‐Based Photopharmacology Open
Chemical photoswitches have become a widely used approach for the remote control of biological functions with spatiotemporal precision. Several molecular scaffolds have been implemented to improve photoswitch characteristics, ranging from …
View article: Deuteration provides a general strategy to enhance azobenzene-based photopharmacology
Deuteration provides a general strategy to enhance azobenzene-based photopharmacology Open
Herein, we present deuterated azobenzene photoswitches as a general means of enhancing photopharmacological molecules. Deuteration can improve azobenzene performance in terms of light sensitivity, photoswitch efficiency, and photoswitch ki…
View article: The Effect of the Relative Size of the Exciton Reservoir on Polariton Photophysics
The Effect of the Relative Size of the Exciton Reservoir on Polariton Photophysics Open
Strong interactions between excitons and photons lead to the formation of exciton‐polaritons, which possess different properties compared to their constituents. Polaritons are created by incorporating a dye in an optical cavity where the e…
View article: The Rise and Current Status of Polaritonic Photochemistry and Photophysics
The Rise and Current Status of Polaritonic Photochemistry and Photophysics Open
The interaction between molecular electronic transitions and electromagnetic fields can be enlarged to the point where distinct hybrid light-matter states, polaritons, emerge. The photonic contribution to these states results in increased …
View article: Layered 3D Covalent Organic Framework Films Based on Carbon–Carbon Bonds
Layered 3D Covalent Organic Framework Films Based on Carbon–Carbon Bonds Open
The development of covalent organic frameworks (COFs) during the past decades has led to a variety of promising applications within gas storage, catalysis, drug delivery, and sensing. Even though most described synthesis methods result in …
View article: Quantitative Investigation of the Rate of Intersystem Crossing in the Strong Exciton–Photon Coupling Regime
Quantitative Investigation of the Rate of Intersystem Crossing in the Strong Exciton–Photon Coupling Regime Open
Strong interactions between excitons and photons lead to the formation of exciton-polaritons, which possess completely different properties compared to their constituents. The polaritons are created by incorporating a material in an optica…
View article: A self-standing three-dimensional covalent organic framework film
A self-standing three-dimensional covalent organic framework film Open
Covalent crystals such as diamonds are a class of fascinating materials that are challenging to fabricate in the form of thin films. This is because spatial kinetic control of bond formation is required to create covalently bonded crystal …
View article: Chemical transformer compression for accelerating both training and inference of molecular modeling
Chemical transformer compression for accelerating both training and inference of molecular modeling Open
Transformer models have been developed in molecular science with excellent performance in applications including quantitative structure-activity relationship (QSAR) and virtual screening (VS). Compared with other types of models, however, …
View article: Room Temperature Dye Glasses: A Guideline Toward the Fabrication of Amorphous Dye Films with Monomeric Absorption and Emission
Room Temperature Dye Glasses: A Guideline Toward the Fabrication of Amorphous Dye Films with Monomeric Absorption and Emission Open
The morphology of films containing photoactive materials is crucial for the performance of solid-state dye applications. Organic dyes tend to crystallize due to their usually planar molecular structure and the resulting intermolecular inte…
View article: Electroactive Covalent Organic Framework Enabling Photostimulus-Responsive Devices
Electroactive Covalent Organic Framework Enabling Photostimulus-Responsive Devices Open
Two-dimensional covalent organic frameworks (2D COFs) feature graphene-type 2D layered sheets but with a tunable structure, electroactivity, and high porosity. If these traits are well-combined, then 2D COFs can be applied in electronics t…
View article: Detachable all-carbon-linked 3D covalent organic framework films for semiconductor/COF heterojunctions by continuous flow synthesis
Detachable all-carbon-linked 3D covalent organic framework films for semiconductor/COF heterojunctions by continuous flow synthesis Open
New synthetic strategies are ceaselessly being explored to fabricate covalent organic frameworks (COFs) as continuous materials with controlled morphology. However, making substrate detachable thin layers of 3D COFs, which would allow for …
View article: Chemical transformer compression for accelerating both training and inference of molecular modeling
Chemical transformer compression for accelerating both training and inference of molecular modeling Open
Transformer models have been developed in molecular science with excellent performance in applications including quantitative structure-activity relationship (QSAR) and virtual screening (VS). Compared with other types of models, however, …
View article: Interplay between Polaritonic and Molecular Trap States
Interplay between Polaritonic and Molecular Trap States Open
Strong exciton-photon coupling exhibits the possibility to modify the photophysical properties of organic molecules. This is due to the introduction of hybrid light-matter states, called polaritons, which have unique physical and optical p…
View article: Organic charged polaritons in the ultrastrong coupling regime
Organic charged polaritons in the ultrastrong coupling regime Open
We embedded an all-hydrocarbon-based carbocation in a metallic microcavity\nthat was tuned to resonance with an electronic transition of the carbocation.\nThe measured Rabi splitting was 41% of the excitation energy, putting the\nsystem we…
View article: Effect of the Aza-N-Bridge and Push–Pull Moieties: A Comparative Study between BODIPYs and Aza-BODIPYs
Effect of the Aza-N-Bridge and Push–Pull Moieties: A Comparative Study between BODIPYs and Aza-BODIPYs Open
In the field of fluorescent dyes, difluoroboron-dipyrromethenes (BODIPY) have a highly respected position. To predict their photophysical properties prior to synthesis and therefore to successfully design molecules specifically for one's n…
View article: Recyclable optical bioplastics platform for solid state red light harvesting<i>via</i>triplet–triplet annihilation photon upconversion
Recyclable optical bioplastics platform for solid state red light harvesting<i>via</i>triplet–triplet annihilation photon upconversion Open
Sustainable red light harvesting has been achieved in recyclable protein–surfactant–chromophores co-assembled bioplastics with high efficiency due to the efficient diffusion of triplet excited chromophores, and oxygen blockage by protein f…
View article: Recent advances in triplet–triplet annihilation upconversion and singlet fission, towards solar energy applications
Recent advances in triplet–triplet annihilation upconversion and singlet fission, towards solar energy applications Open
Here we consolidate recent advances in the fields of triplet–triplet annihilation photon upconversion and singlet fission. We further describe their utility in increasing the efficiency of photovoltaic devices.
View article: Modulating TTA efficiency through control of high energy triplet states
Modulating TTA efficiency through control of high energy triplet states Open
It is shown here that positional isomerism of perylene substitution affects high energy triplet states differently. This in turn influences the quantum efficiency of triplet–triplet annihilation photon upconversion.
View article: Electroactive covalent organic frameworks: a new choice for organic electronics
Electroactive covalent organic frameworks: a new choice for organic electronics Open
Covalent organic frameworks (COFs) with implemented electroactive moieties and coherent conduction channels are found to be competent for the transport of charges, in a similar manner as conventional organic (semi)conductors.Unlike densely…
View article: Exciton Delocalization Counteracts the Energy Gap: A New Pathway toward NIR-Emissive Dyes
Exciton Delocalization Counteracts the Energy Gap: A New Pathway toward NIR-Emissive Dyes Open
Exciton coupling between the transition dipole moments of ordered dyes in supramolecular assemblies, so-called J/H-aggregates, leads to shifted electronic transitions. This can lower the excited state energy, allowing for emission well int…