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Boosting the circularly polarized luminescence of small organic molecules has been a stubborn challenge because of weak structure rigidity and dynamic molecular motions. To investigate and eliminate these factors, here, we carried out the structure‐property relationship studies on a newly‐developed axial chiral scaffold of bidibenzo[b,d]furan. The molecular rigidity was finely tuned by gradually reducing the alkyl‐chain length. The environmental factors were considered in solution, crystal, and polymer matrix at different temperatures. As a result, a significant amplification of the dissymmetry factor glum from 10−4 to 10−1 was achieved, corresponding to the situation from (R)‐4C in solution to (R)‐1C in polymer film at room temperature. A synergistic strategy of increasing the intramolecular rigidity and enhancing the intermolecular interaction to restrict the molecular motions was thus proposed to improve circularly polarized luminescence. The though‐out demonstrated relationship will be of great importance for the development of high‐performance small organic chiroptical systems in the future. [ABSTRACT FROM AUTHOR]

Chiral luminescent materials are a class of materials capable of emitting circularly polarized light (CPL). Radicals are unique open‐shell compounds with exceptional photoelectromagnetic properties that can be exploited in constructing novel chiral luminescent materials. This Concept discussed three main catalogues for producing organic CPL radicals, intrinsic chiral luminescent radicals, luminescent radicals with chiral substitutions, and field‐regulation‐induced chiral luminescent radicals. The brief review of their properties aims at providing basic guidelines and supporting further development of novel chiral luminescent radical systems. [ABSTRACT FROM AUTHOR]

This article provides a comprehensive overview of circularly polarized room-temperature phosphorescence (CP-RTP) in purely organic luminophores. It explores the challenges in constructing purely organic CP-RTP systems and discusses the photophysics of CP-RTP. The article also examines different types of purely organic CP-RTP systems based on chiral structures and offers insights and suggestions for future advancements in this area. Overall, ongoing research in this field shows promise for the development of purely organic CP-RTP systems with various applications. [Extracted from the article]

Phototheranostic agents have thrived as promising tools for cancer theranostics because of the integration of sensitive in situ fluorescence imaging and effective multi‐model synergistic therapy. However, how to manipulate the intangible photon energy transfer to balance the competitive radiative and nonradiative processes is still challenging. Although numerous phototheranostic molecules are reported, their complicated molecular design and tedious synthesis often stumble further their development. Herein, three simple molecules with electron donating−accepting structures are developed. The electron acceptor engineering on molecules by introducing acridinium unit gives rise to TPEDCAc with aggregation‐induced second near‐infrared emission (AIE NIR‐II), high reactive oxygen species generation capability, and excellent photothermal conversion efficiency (44.8%) due to the drastic intramolecular motion of large acridinium rotor and balanced AIE effect. Experimental analysis and calculation on the controlled molecules suggested that large torsional angle and the strong electron‐withdrawing ability of the acridinium unit are keys for NIR‐II emission and balanced photodynamic/photothermal conversion. Impressively, the positively charged TPEDCAc shows mitochondria‐targeting capability and high performance in in vivo multi‐modal cancer theranostics under NIR laser irradiation. Hence, this work not only provides a single NIR‐II AIE‐based multi‐modal cancer theranostic system but inspires new insights into future development of new theranostic platforms. [ABSTRACT FROM AUTHOR]

In their Communication (e202202977), Zikai He et al. report on the circularly polarized room-temperature phosphorescence of a bidibenzo[ I b,d i ]furan scaffold with locked axial chirality. Bidibenzo[b,d]furan, Circularly-Polarized Luminescence, Locked Axial Chirality, Poly(Vinyl Alcohol), Room-Temperature Phosphorescence Keywords: Bidibenzo[b,d]furan; Circularly-Polarized Luminescence; Locked Axial Chirality; Poly(Vinyl Alcohol); Room-Temperature Phosphorescence EN Bidibenzo[b,d]furan Circularly-Polarized Luminescence Locked Axial Chirality Poly(Vinyl Alcohol) Room-Temperature Phosphorescence 1 1 1 07/20/22 20220725 NES 220725 B Organic Electronics b . [Extracted from the article]

The development of novel luminescent radicals, characterized by their unique doublet emission, endows a significant challenge. In this study, we reported the synthesis of a luminescent neutral radical, BCzAnM‐R, tailored by two carbazolyl groups and an anthryl group to achieve a nonalternant structure. It exhibited near‐infrared emission with a peak at 1020 nm in toluene. Interestingly, its corresponding cation, BCzAnM‐C, was synthesized through an unconventional SnCl2‐mediated reduction‐aromatization‐oxidation reaction in one‐pot and gram‐scale. The cation demonstrated remarkable stability for up to weeks in ambient conditions and facilitated the silica‐gel chromatography isolation as an organic salt with SnCl3− as the counter ion. The carbazolyl groups effectively modulate molecular structures, photophysical properties, and stabilities. Notably, BCzAnM‐R represents the first luminescent triarylmethyl radical with two carbazolyl groups directly attached to the central carbon. [ABSTRACT FROM AUTHOR]