The photoluminescence (PL) of metal nanoclusters (NCs), originating from their molecule-like electronic structure, is one the most intriguing properties NCs. Although various strategies such as tailoring size, and chemical environment NCs have shown to improve PL, quantum yields (QYs) are still lagging far behind those conventional luminescent materials, including dots organic fluorophores. Herein, we report synthesis highly gold cluster assembly (GCA) Zn2+-ion-mediated Au4(SRCOO–)4 clusters...

The quantitative detection of circularly polarized light (CPL) is necessary in next-generation optical communication carrying high-density information and phase-controlled displays exhibiting volumetric imaging. In the current technology, multiple pixels different wavelengths polarizers are required, inevitably resulting high loss low efficiency. Here, we demonstrate a highly efficient CPL-detecting transistor composed chiral plasmonic nanoparticles with Khun's dissymmetry (g-factor) 0.2...

Plasmonic nanostructures confine light on the nanoscale, enabling ultra-compact optical devices that exhibit strong light–matter interactions. Quantum dots are ideal for probing plasmonic because of their nanoscopic size and desirable emission properties. However, with single quantum has remained challenging small also makes them difficult to manipulate. Here we demonstrate use as on-demand probes imaging nanostructures, well realizing spontaneous control at emitter level nanoscale spatial...

Coupling of an atom-like emitter to surface plasmons provides a path toward significant optical nonlinearity, which is essential in quantum information processing and networks. A large coupling strength requires nanometer-scale positioning accuracy the near plasmonic structure, challenging. We demonstrate single localized defects tungsten diselenide (WSe2) monolayer self-aligned plasmon mode silver nanowire. The nanowire induces strain gradient on at overlapping area, leading formation...

Photoinduced electron transfer of a radical species provides promising strategy for expanding the scope photoredox catalysis. However, mechanism underlying radical-ion catalysis has yet been fully established. In present research, we investigated generation and annihilation key catalytic intermediate in borylation reaction aryl halides. To disentangle intricate cycle, conducted experiments using electrochemical, transient absorption photoluminescence spectroscopy quantum chemical calculation...

Abstract An emitter near a surface induces an image dipole that can modify the observed emission intensity and radiation pattern. These image-dipole effects are generally not taken into account in single-emitter tracking super-resolved imaging applications. Here we show interference between its strong polarization anisotropy large spatial displacement of We demonstrate these by single quantum dot along two orthogonal polarizations as it is deterministically positioned silver nanowire. The...

We report on the dynamical response of single layer transition metal dichalcogenide MoS2 to intense above-bandgap photoexcitation using nonlinear-optical second order susceptibility as a direct probe electronic and structural dynamics. Excitation conditions corresponding one electron-hole pair per unit cell generate unexpected increases in harmonic from monolayer films, occurring few picosecond time-scales. These large amplitude changes recover tens time-scales are reversible at megahertz...

Abstract Combating biofilm infections remains a challenge due to the shield and acidic conditions. Herein, an acid‐responsive nanoporphyrin (PN3‐NP) based on self‐assembly of water‐soluble porphyrin derivative (PN3) is constructed. Additional kinetic control sites formed by conjugation spermine molecules macrocycle make PN3 self‐assemble into stable nanoparticles in physiological environment. Noteworthily, near‐infrared (NIR) fluorescence monitoring synergistic photodynamic therapy (PDT)...

Understanding carrier relaxation in lead halide perovskites at the nanoscale is critical for advancing their device physics. Here, we directly image cooling polycrystalline CH3NH3PbI3 films with nanometer spatial resolution. We observe that upon photon absorption, highly energetic carriers rapidly thermalize lattice different rates across film. The initial temperatures vary by many multiples of temperature hundreds nanometers, a factor cannot be accounted excess energy above bandgap alone or...

While energetic plasmonic hot carriers in nonthermal equilibrium states have pushed the limits of energy conversion efficiency plasmon-driven photocatalysts and optoelectronics, acceleration hot-hole flux remains a challenge. Here, we demonstrate an approach to control generation injection nature holes released from Au nanomesh/p-type GaN (p-GaN) Schottky architecture by modulating polarity p-GaN. This modulation enhances into platform, thereby accelerating Landau damping stemming increased...

Abstract The slow cooling of hot carriers (HCs) is essential for realizing HC‐based solar cells, transistors, and photodetectors, as it enhances the extraction efficiency HCs’ excess energy. Recently, perovskites have gathered attention due to their long HC times, but face challenges such toxicity low air stability. Here, ultrafast transient absorption (TA) spectroscopy utilized investigate dynamics in few‐layer α‐In 2 Se 3 , a nontoxic air‐stable 2D material with high carrier mobility....

Abstract Low‐symmetry layered materials are emerging as promising platforms for polarization‐driven nanophotonics. Understanding their nonequilibrium photoresponses, especially polarization dependence, is not only essential designing high‐performance devices but also provides new anisotropic light–matter interactions. Here, unique optical‐gap shifts presented in germanium sulfide (GeS) using ultrafast differential transmission (DT) microscopy. Upon pump excitation, bandgap renormalization...

Understanding the photodegradation mechanism of photoactive materials is critical for enhancing long-term stability organic photovoltaic cells (OPVs). However, definitive mechanisms have not been reported yet. Here we report comprehensive understanding PTB7-Th polymer film. UV/vis absorption and photoluminescence spectra show that π-conjugated backbone intermolecular π–π interactions are simultaneously broken under sunlight in air. Raman reveal initial photooxidation begins at thiophene ring...

A series of donor–coumarin dyads exhibit dual emission with thermally activated delayed fluorescence which emerges from the π–π* and intramolecular charge-transfer transition states.

Abstract Strongly bound excitons are a characteristic hallmark of 2D semiconductors, enabling unique light–matter interactions and novel optical applications. Platinum diselenide (PtSe 2 ) is an emerging material with outstanding electrical properties excellent air stability. Bulk PtSe semimetal, but its atomically thin form shows semiconducting phase the appearance band‐gap, making one expect strongly excitons. However, in have been barely studied, either experimentally or theoretically....

Abstract Layered quasi‐1D nanomaterials exhibit strong linear dichroism and effective light‐matter interactions, promising for novel information devices driven by light‐polarization. In particular, their optical anisotropy ultrafast photoresponse allow polarization‐controlled nanophotonic switches modulators. However, the technology still requires substantial further studies due to an insufficient understanding of modulation mechanisms limited investigations a few materials. Here, transient...

Abstract A short 16‐amino acid peptide has been used in place of an antibody to selectively detect the specific Anthrax biomarker, protective antigen (PA), using surface‐enhanced Raman scattering (SERS). Peptides are more stable than antibodies under various biological conditions and easily synthesized for a target. that high affinity PA was conjugated onto gold nanoparticles along with reporter then incubated concentrations PA. Parallel studies which sequence replaced were performed compare...

Metal halide perovskites are promising solar energy materials, but their mechanism of action remains poorly understood. It has been conjectured that energetically stabilized states such as those corresponding to polarons, quasiparticles in which the carriers dressed with phonons, responsible for remarkable photophysical properties. Yet, no direct evidence polarons or other low-energy have reported despite extensive efforts. Such should manifest below bandgap features transient absorption and...

Abstract This study presents the Br‐rich in situ synthesis of blue‐emitting 2D CsPbBr 3 nanoplatelets (NPLs) with various Br/Pb ratios using ZnBr 2 as a Br precursor to enhance ion adsorption significantly. leads effective passivation surface defects, particularly Pb−Br bonds, by increasing positive charge density around Pb atoms, thus creating stable bonding environment and reducing defect formation. Consequently, photoluminescence quantum yield (PLQY) improves from 31.15% for ratio 87.2%...

We investigate the connections between two field-enhanced phenomena of gold nanoparticles: multiphoton-absorption-induced luminescence (MAIL) and metal-enhanced multiphoton absorption polymerization (MEMAP). observe a strong correlation nanoparticles aggregates that have high efficiency for each process. The results our studies indicate this system, MEMAP is driven not by two-photon photoinitiator but rather single-photon excitation MAIL emission.