Organic molecules which can undergo excited-state intramolecular proton transfer (ESIPT) process have been considered as ideal gain materials for near-infrared organic lasers owing to their effective four-level systems. However, extending lasing wavelength beyond 800 nm with present ESIPT-active is still in challenge. Herein, we established a molecular design strategy that operates via the π-conjugated system of ESIPT parent core enhance cascaded double and thus achieve red-shifted six-level...

Upconverting infrared light into visible via the triplet-triplet annihilation process in solid state is important for various applications including photovoltaics, photodetection, and bioimaging. Although inorganic semiconductors with broad absorption negligible exchange energy loss have emerged as promising alternative to molecular sensitizers, currently, they exclusively suffered from low efficiency contained toxic elements near-infrared (NIR)-to-visible upconversion. Here, we report an...

Whether and how an electron-hole pair at the donor-acceptor interface separates from their mutual Coulombic interaction has been a long-standing question for both fundamental interests optoelectronic applications. This is particularly interesting but yet to be unraveled in emerging mixed-dimensional organic/2D semiconductor excitonic heterostructures where Coulomb poorly screened. Here, by tracking characteristic electroabsorption (Stark effect) signal separated charges using transient...

Organic charge transfer (CT) cocrystals open a new door for the exploitation of low-dimensional near-infrared (NIR) emitters by convenient self-assembly approach. However, research about fabrication sheet-like NIR-emitting microstructures that are significant structural construction and integrated application is limited unidirectional molecular packing mode. Herein, via regulation biaxial intermolecular CT interaction, single-crystalline microsheets with remarkable NIR emission from 720 to...

Abstract Organic semiconductor molecules possess chemical tunability and large stimulated emission cross section, representing a promising candidate for laser gain medium. However, the pursuit of telecom‐wavelength organic lasers, one major obstacles is lack effective energy‐level systems with high optical to compensate exciton deactivation losses. Herein, effects molecular conformation‐dependent distinct cascaded proton‐transfer six‐level energy on lasing properties are systematically...

Abstract Singlet fission (SF) is an appealing process where one photoexcited singlet transforms to two triplets, which can overcome thermalization energy loss and improve solar cell efficiency. However, it remains unclear how intermolecular coupling, subject molecular stacking, controls SF pathways dynamics. Here, we prepared polymorph rubrene single crystals with different stacking geometries, including orthorhombic (Orth.), triclinic (Tri.), monoclinic (Mono.) phases. By micro‐area...

Recent theoretical and experimental findings have demonstrated the minimum characteristic in harmonic spectrum of bulk MgO crystals subjected to intense laser pulses. However, dominant mechanism behind this structure is still under debate. This study simulates from a crystal linearly polarized pulse by solving multi-band semiconductor Bloch equations. The results show that feature at 20 eV spectra 1700 800 nm pulses due band dispersion interference between interband harmonics. Notably,...

Hybrid heterostructures (HSs) comprising organic and two-dimensional (2D) monolayer semiconductors hold great promise for optoelectronic applications. So far, research efforts on organic/2D HSs have exclusively focused coupling directly photoexcited singlets to semiconductors. It remains unexplored whether how the optically dark triplets in with intriguing properties (e.g., long lifetime) can be implemented modulating light–matter interactions of hybrid HSs. Herein, we investigate triplet...

Hybrid heterostructures comprising organic and two-dimensional (2D) layered semiconductors hold great promise for light harvesting optoelectronic applications. Among them, materials that exhibit singlet fission (SF) in which one exciton generates two triplet excitons are particularly attractive can potentially improve the performance of device. However, SF-enhanced devices require SF compete with direct energy/charge transfer from exciton. Here, we performed ultrafast spectroscopic studies...

Removal of naphthenic acids is very important for oil refineries to lower its corrosion equipments. Esterification can be an interesting method the acid concentration high number oils. The kinetics esterification low-concentration and methanol in oils with or without SnO as a catalyst have been investigated at 180, 200, 220, 250, 280 °C autoclave molecular ratio 10:1. experiment data follows second-order reaction equation catalyst. activation energy, “ E a”, frequency factor, A”, rate...

Four new xanthones, cratocochinones A–D (1–4), together with eight known analogues (5–12), were isolated from the stems and leaves of Cratoxylum cochinchinense. The chemical structures (1–4) elucidated by comprehensive spectroscopic analyses compounds identified comparisons spectral data reported in literature. All 1–12 evaluated for their anti-inflammatory activities anti-HIV-1 activities. Compounds showed remarkable inhibitory on nitric oxide (NO) production induced lipopolysaccharide...

Abstract The family of metal‐free molecular perovskites, an emerging novel class eco‐friendly semiconductor, welcomes a new member with unique 1D hexagonal perovskite structure. Lowering dimensionality at level is facile strategy for crystal structure conversion, optoelectronic property regulation, and device performance optimization. Herein, the study reports design, synthesis, packing structure, photophysical properties perovskite‐related single crystal, rac ‐3APD‐NH 4 I 3 ( ‐3APD=...

Eu‐doped ZnO nanorod ordered array thin films were synthesized on glass substrates with a seed layer via hydrothermal method. XRD reveals that the (002) diffraction peak of annealed in hydrogen is sharper than air. SEM nanorods are shortened and widened. TEM results demonstrate single crystalline lattice spacing 0.52 nm agrees d (001) crystal planes along c ‐axis. Room temperature photoluminescence (PL) PL strongest shifts to lower wavenumber. The point defect film transferred from O i Zn by...

The development of excellent full-spectrum photocatalysts is vital significance to its practical application in environmental remediation. Herein, flower-like Ag₂CO₃/BiOCOOH type I heterostructures were prepared via a facile method and exhibited powerful photocatalytic activity by removing various toxic pollutants (rhodamine B, methyl blue, tetracycline hydrochloride) under simulated sunlight irradiation. boosted performance attributed the expanded range absorption spectrum alleviated...

Abstract The restitution coefficient is a crucial indicator of energy dissipation. This article discusses the used coefficients and presents method to measure particle velocities before after collisions using high-speed camera testing. study primarily explores influence characteristics (collision velocity, collision angle, rotation speed, material) on during between spherical particles flat plate. main focus studying how changes in angles impact coefficient. Different materials ball test...

A phytochemical study on the fruits of Artocarpus heterophyllus caused isolation a previously undescribed steroid, artoheterophoid (1), together with seven known analogues (2 − 8). The chemical structure 1 was elucidated basis comprehensive spectroscopic methods and compounds 8) were identified by comparing their data those reported in literatures. All (2–8) separated from A. for first time. isolated (1–8) assessed anti-inflammatory activities vitro measuring inhibitory effect against nitric...

The chemical consituents from Ochrosia elliptica were separated and purified by column chromatographies on silica gel, Sephadex LH-20, ODS RP-HPLC. structures of the isolated compounds identified basis physicochemical properties spectroscopic analysis, as well comparisons with data in literature. 18 elucidated (+) -pinoresinol(1), -medioresinol (2), -lariciresinol (3), -5'-methoxy lariciresinol(4), -isolariciresinol (5), syringaresinol(6), episyringaresinol (7), ciwujiatone (8),...

Functionalized graphene oxide-modified poly(ε-caprolactone) composites ((graphene oxide)GO/PCL) were successfully synthesized by Steglich esterification for drug applications of controlled release. Lomefloxacin (LMF) was selected as a model to investigate its release properties. The effect the LMF-contained pills GO/PCL and polylactic acid blend evaluated. In contrast pure PCL, could effectively adjust time at constant rate, achieving requirements. Furthermore, different additive amounts...