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Molecular ultralong room‐temperature phosphorescence (RTP), exhibiting multiple stimuli‐responsive characteristics, has garnered considerable attention due to its potential applications in light‐emitting devices, sensors, and information safety. This work proposes the utilization of photochemical cascade processes (PCCPs) in molecular crystals to design a stepwise smart RTP switch. By harnessing the sequential dynamics of photo‐burst movement (induced by [2+2] photocycloaddition) and photochromism (induced by photogenerated radicals) in a bismuth (Bi)‐based metal‐organic halide (MOH), a continuous and photo‐responsive ultralong RTP can be achieved. Furthermore, utilizing the same Bi‐based MOH, diverse application demonstrations, such as multi‐mode anti‐counterfeiting and information encryption, can be easily implemented. This work thus not only serves as a proof‐of‐concept for the development of solid‐state PCCPs that integrate photosalient effect and photochromism with light‐chemical‐mechanical energy conversion, but also lays the groundwork for designing new Bi‐based MOHs with dynamically responsive ultralong RTP. [ABSTRACT FROM AUTHOR]

Ensuring information security has emerged as a paramount concern in contemporary human society. Substantial advancements in this regard can be achieved by leveraging photonic signals as the primary information carriers, utilizing photonic logical gates capable of wavelength tunability across various time and spatial domains. However, the challenge remains in the rational design of materials possessing space‐time‐color multiple‐resolution capabilities. In this work, a facile approach is proposed for crafting metal‐organic halides (MOHs) that offer space‐time‐color resolution. These MOHs integrate time‐resolved room temperature phosphorescence and color‐resolved excitation wavelength dependencies with both space‐resolved ex situ optical waveguides and in situ heterojunctions. Capitalizing on these multifaceted properties, MOHs‐based two‐dimensional (2D) optical waveguides and heterojunctions exhibit the ability to tune full‐color emissions across the spectra from blue to red, operating within different spatial and temporal scales. Therefore, this work introduces an effective methodology for engineering space‐time‐color resolved MOH microstructures, holding significant promise for the development of high‐density photonic logical devices. [ABSTRACT FROM AUTHOR]

In this concept, we showcase the upsurge in the studies of dynamic ultralong room‐temperature phosphorescence (RTP) materials containing inorganic and/or organic components as versatile photo‐responsive platforms. The goal is to provide a comprehensive analysis of photo‐controllable RTP, and meanwhile delve into the underlying RTP properties of various classes of photochromic materials including metal‐organic complexes, organic‐inorganic co‐crystals, purely organic small molecules and organic polymers. In particular, the design principles governing the integration of the photochromic and RTP moieties within a single material system, and the tuning of dynamic RTP in response to light are emphasized. As such, this concept sheds light on the challenges and opportunities of using these tunable RTP materials for potential applications in optoelectronics, particularly highlighting their use of reversible information encryption, erasable light printing and rewritable smart paper. [ABSTRACT FROM AUTHOR]

Glycerol, as the major by-product of biodiesel, is a highly versatile molecule with three similar hydroxyl groups. Recently, great efforts have been made to find active catalysts and suitable catalytical technology to convert it into various valuable fine chemicals. Catalytic oxidation of glycerol via renewable sources of solar energy have attracted much attention because of the unique reaction pathway induced by photogenerated reactive species as well as the mild reaction conditions required. In this review, we describe the recent development of selective oxidation pathways for conversion of glycerol to value-added chemicals via photocatalysis and photoelectrocatalysis, specifically, how to realize C–OH bond oxidation to C＝O with other functional groups preserved, and C–C bond cleavage and oxidation to carboxyl, –COOH. Particular emphasis is paid to the design of catalyst active structures in the given reaction pathways, including semiconductors with specific adsorption sites, surface plasmon resonance metals, transition metal complex cocatalysts, and synergy with photongenerated reactive oxygen species (ROS). Therefore, this review provides an in-depth understanding of the mechanisms for selective oxidation of glycerol via photocatalysis/photoelectrocatalysis as important guidance for the design of efficient catalysts. [ABSTRACT FROM AUTHOR]

The luminescence color of molecule‐based photoactive materials is the key to the applications in lighting and optical communication. Realizing continuous regulation of emission color in molecular systems is highly desirable but still remains a challenge due to the individual emission band of purely organic molecules. Herein, a novel alloy strategy based on molecular co‐crystals is reported. By adjusting the molar ratio of pyrene (Py) and fluorathene (Flu), three types of molecular co‐crystal alloys (MCAs) assemblies are prepared involving Py‐Flu‐OFN‐x%, Py‐Flu‐TFP‐x%, Py‐Flu‐TCNB‐x%. Multiple energy level structure and Förster resonance energy transfer (FRET) process endow materials with tunable full‐spectra emission color in visible region. Impressively, these MCAs and co‐crystals can be successfully applied to low optical loss waveguide and optical logic gate by virtue of all‐color luminescence from blue across green to red, together with smooth surface of one‐dimensional microrods, which show promising applications as continuous light emitters for advance photonics applications. [ABSTRACT FROM AUTHOR]

We explore the polymorphism of a weakly polar molecule, dibenzoylmethane, in which the intramolecular hydrogen-bonded enol "chelated" form is favoured. A simple geometric method on the basis of interatomic distance to visualize and count favourable connections between non-hydrogen atoms was constructed to judge the strength of intermolecular interactions in polymorphs of this kind of weakly polar molecule. The number of total favourable connections mirrored with resonance-assisted hydrogen bonds (RAHB) and aromatic interactions in DBM polymorphs increases from forms I to III, in agreement with the order of their equivalent interaction energies, proving that it is feasible for this geometric approach to be used in this weakly polar system. [ABSTRACT FROM AUTHOR]