Endowing Phosphor Materials with Long‐Afterglow Circularly Polarized Phosphorescence via Ball Milling

Hao, Wenchao; Li, Yuangang; Liu, Minghua

doi:10.1002/adom.202100452

Cited by 23 publications

(18 citation statements)

References 70 publications

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“…For instance, Kawai and co-workers shed light on the naked-eye-detectable CPL using helicates with a g lum up to 1.25 . In spite of this work, most studies on CPL focus on the fundamental investigation without applications due to the limited g lum . − ,, Therefore, in the present work, the g lum of circularly polarized phosphorescence ranges from 1 to 5 × 10 –3 . Without a spectrometer, it is hard to recognize the circularly polarized phosphorescence using the naked eye.…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet Light Detectable Circularly Polarized Room Temperature Phosphorescence in Chiral Naphthalimide Self-Assemblies

Liang

Hao

et al. 2021

ACS Nano

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The combination of circularly polarized luminescence (CPL) and pure-organic room temperature phosphorescence (RTP) potentially facilitates the construction of organic chiroptical optoelectronics and display materials, which however are challenging to use in realizing smart control of luminescent colors and switchable chiroptical properties. Here, we show a host−guest strategy to fabricate color-tunable RTP-based circularly polarized phosphorescence. Napthalimides were conjugated directly to chiral segments, of which supramolecular chirality and CPL activities in solid-states could be triggered by substituting bromine atoms on amines. Introducing tetracyanobenzene as an achiral host matrix via simple grinding would allow for the intersystem crossing to trigger red RTP and corresponding CPL by excitation lower than 320 nm, with a large Stokes shift more than 300 nm. The critical excitation wavelength of the RTP switch is determined by the absorbance of tetracyanobenzene. When the excitation wavelength was larger than 320 nm, blue fluorescence dominated with turned off RTP and CPL. The excitation wavelength-dependent RTP and CPL switch allows for detecting ultraviolet (UV) light, showing distinguishable red−blue luminescent color transition, accompanied by on/off RTP. Changing the host matrix from tetracyanobenzene to tricyanobenzene or dicyanobenzene could adjust the critical detecting wavelength limit from 320 to 300 nm. This work establishes a strategy to realize color-tunable, UV light detectable RTP and CPL under smart control.

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Section: Resultsmentioning

confidence: 99%

Ultraviolet Light Detectable Circularly Polarized Room Temperature Phosphorescence in Chiral Naphthalimide Self-Assemblies

Liang

Hao

et al. 2021

ACS Nano

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confidence: 99%

Circularly Polarized Phosphorescence from Cocrystallization of Atomic Precise Silver Nanoclusters with Tartaric Acid

Feng

Wang

Sun

et al. 2022

Advanced Optical Materials

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Recently, chirality was successfully introduced to rare earth complexes, which have long afterglow phosphorescence, by ball-milling with l/d-cysteine, leading to CPP with a dissymmetry factor (g lum ) up to 10 −2 . [16] CPP from multiple metal centers has also been achieved by the preparation of a homochiral metal-organic framework. [17] Despite these fantastic examples, the candidates for creating CPP are still limited. New candidates with a long lifetime and intrinsic phosphorescence are urgently needed to widen the family of CPP materials and broaden the scope of their applications.Metal nanoclusters (NCs) are intermediates between single-metal complexes and metal nanoparticles. [18,19] Metal NCs, especially those formed by the complexation of metal ions with organic ligands, could have atomic precision proved by single-crystal X-ray diffraction analysis. Their photoluminescence is normally weak in dilute dispersions or amorphous state, which is disadvantageous for the construction of CPP materials. However, this drawback could be overcome by lowering the temperature or forcing them to form highly ordered supramolecular structures. [20] In the latter case, in most cases, the emission is characterized by a relatively long lifetime of microseconds that could be assigned to phosphorescence in nature. For the chirality which is another necessity to induce CPP, chiral organic ligands were routinely adopted during the preparation of the metal NCs. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Based on these efforts, a few metal NCs that exhibit CPP in solid states have been successfully created, including gold, [27][28][29] silver, [30,31] and copper [32][33][34][35] NCs.In terms of the chirality of a given system, the building blocks are unnecessarily chiral, which has been confirmed by chiral supramolecular self-assemblies formed by achiral organic molecules, such as those with C 3 -symmetry. [36][37][38] However, this rule has not been demonstrated for metal NCs until very recently. [39] The breakthrough came from the assembly of watersoluble silver NCs ((NH 4 ) 9 [Ag 9 (mba) 9 ], H 2 mba = 2-mercaptobenzoic acid, abbreviated to Ag 9 -NCs hereafter), which were facilely obtained by coordination of Ag(I) with 2-mercaptobenzoic acid (H 2 mba) in water in the presence of ammonia-water (Figure 1a). Single-crystal X-ray diffraction analysis showed each cluster has a core of nine Ag(I) ions that resembles a triangular prism comprising three Ag 3 trigons. The cluster has a C 3 axis that passes Recently, advanced optical materials with circularly polarized phosphorescence (CPP) have attracted much attention. However, such materials are limited due to the difficulty of preparation and the scarcity of precursors. Herein, CPP materials are constructed for the first time using water-soluble, pseudo-chiral silver nanoclusters with atomic precision ((NH 4 ) 9 [Ag 9 (mba) 9 ], H 2 mba = 2-mercaptobenzoic acid, abbreviated to Ag 9 -NCs hereafter). Induced by the complexation of l-or d-tartaric acid (TrA) through h...

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“…Ball-milling can also induce chemical reactions such as grafting, degradation, and catalysis due to the higher concentration of catalysts in chemical systems without solvents. Hao et al [60] used a rare earth inorganic persistent phosphor and a ball-milling method to bind an enantiomeric species on the surface of their materials. This approach effectively transferred molecular chirality to their luminescent materials by surface bonding, realizing a chiral inorganic long afterglow material by mixing a chiral molecule with the inorganic precursor materials.…”

Section: Ball-milling-induced Mechanochemistrymentioning

confidence: 99%

A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

et al. 2022

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high volatility, and poor security, renewable energy must be converted and stored before it can be stably and efficiently used. [2] Energy conversion refers to the conversion of one form of energy to another form, or several forms. This is achieved through energy conversion devices and corresponding technologies. The core part of energy conversion devices is the active material, which is also the key to providing high conversion efficiency. Chemical synthesis is usually employed for the preparation of various energy conversion active materials, which can be divided into four major categories in terms of reaction principles: thermochemistry, electrochemistry, mechanochemistry, and photochemistry. Among them, mechanochemistry is the study of chemical reactions induced by mechanical energy. [3] Mechanochemical syntheses can be carried out under a variety of conditions, such as at low temperatures, in inert or reactive atmospheres, under high gas pressures, in a solvent or under all-solid-state conditions. Thus, mechanochemical techniques are simple, versatile, and sustainable. Mechanochemistry can be used to develop new methods for some chemical reactions that are difficult to be realized by conventional chemical synthesis.Mechanochemistry was first reported with the development of grinding technology. As early as 315 B.C., Aristotle's students demonstrated for the first time that elemental Hg could be obtained by grinding cinnabar and acetic acid in a mortar. [4] For several decades, the development of mechanochemistry has become more comprehensive and systematic, and mechanochemical methods have been widely used in the fields of inorganic and organic materials, magnetic materials, and metallurgy. Mechanochemical equipment has evolved from the original manual mortar and pestle to a variety of novel mechanized instruments. Mechanochemical techniques including ballmilling, pan-milling, and ultrasonic irradiation have been successfully applied to prepare advanced functional materials for energy conversion and storage. However, most recent surveys/ reviews regarding mechanochemical technologies for material preparation are mainly focused on ball-milling. [3,[5][6][7][8] Recently, the unique advantages of mechanochemistry for energy storage and conversion applications have inspired Mechanochemistry with solvent-free and environmentally friendly characteristics is one of the most promising alternatives to traditional liquid-phase-based reactions, demonstrating epoch-making significance in the realization of different types of chemistry. Mechanochemistry utilizes mechanical energy to promote physical and chemical transformations to design complex molecules and nanostructured materials, encourage dispersion and recombination of multiphase components, and accelerate reaction rates and efficiencies via highly reactive surfaces. In particular, mechanochemistry deserves special attention because it is capable of endowing energy materials with unique characteristics and properties. Herein, the latest advances and progress in me...

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Endowing Phosphor Materials with Long‐Afterglow Circularly Polarized Phosphorescence via Ball Milling

Cited by 23 publications

References 70 publications

Ultraviolet Light Detectable Circularly Polarized Room Temperature Phosphorescence in Chiral Naphthalimide Self-Assemblies

Ultraviolet Light Detectable Circularly Polarized Room Temperature Phosphorescence in Chiral Naphthalimide Self-Assemblies

Circularly Polarized Phosphorescence from Cocrystallization of Atomic Precise Silver Nanoclusters with Tartaric Acid

A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

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