Intense Circularly Polarized Fluorescence and Room-Temperature Phosphorescence in Carbon Dots/Chiral Helical Polymer Composite Films

ACS Nano, Год журнала: 2023, Номер 17(7), С. 6912 - 6921

Опубликована: Март 31, 2023

Chiral carbon dots (C-dots) with a circularly polarized fluorescence (CPF) property have attracted tremendous attention due to their significant applications in chiral optoelectronics and theranostics. However, constructing room-temperature phosphorescent (CPRTP) C-dots remains great challenge. Herein, strategy is established achieve efficient CPF CPRTP emissions C-dots/chiral helical polymer bilayer composite film. Taking advantage of the filter effect polymer, intense large dissymmetric factors up 1.4 × 10-1 1.2 10-2 are respectively obtained, even though there only simple interface contact between layer layer. More importantly, white-color emission multiple information display encryption further realized based on prepared luminescent films.

Язык: Английский

---

Circularly polarized luminescence polymers: From design to applications

Coordination Chemistry Reviews, Год журнала: 2023, Номер 485, С. 215116 - 215116

Опубликована: Март 28, 2023

Язык: Английский

---

Enabling Highly Robust Full‐Color Ultralong Room‐Temperature Phosphorescence and Stable White Organic Afterglow from Polycyclic Aromatic Hydrocarbons

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(10)

Опубликована: Янв. 19, 2024

Abstract In this work, full‐color and stable white organic afterglow materials with outstanding water, solvents, temperature resistances have been developed for the first time by embedding selected polycyclic aromatic hydrocarbons into melamine‐formaldehyde polymer via solution polymerization. The quantum yields lifetimes of resulting films were up to 22.7 % 4.83 s, respectively, under ambient conditions. For coronene‐doped sample, its color could be linearly tuned between yellow blue adjusting temperature, it still emit an intense a lifetime 0.68 s at 440 K. Moreover, showed bright 370 K 2.80 maintained excellent performance after soaking in water solvents more than 150 days. addition, application potential information encryption anti‐counterfeiting was also demonstrated.

Язык: Английский

---

“Matching Rule” for Generation, Modulation and Amplification of Circularly Polarized Luminescence

Accounts of Chemical Research, Год журнала: 2024, Номер 57(8), С. 1188 - 1201

Опубликована: Апрель 5, 2024

ConspectusCircularly polarized luminescence (CPL) generated by chiral luminescent systems has sparked enormous attention in multidisciplinary field as it brings infinite potential for applications, such 3D optical displays, biological probes, and chiroptical sensors. Satisfying both the conditions of chirality (including fluorescence or phosphorescence) is a prerequisite constructing CPL materials. In this regard, whether organic, inorganic, hybrid systems, components generally involve effective coupling through covalent noncovalent bonds. For interactions, copolymerization monomers, although bonds provide high stability system, they inevitably tedious preparation procedures that connect together. bonds, take supramolecular assembly an example, elements achiral light-emitting units are transferred intermolecular their advantages include diversity building blocks, stimuli responsiveness brought well amplification signals coassembly. However, system may be poor, performance morphology difficult to predict. Gratifyingly, matching rule do not rely on together with interactions allows effortless construction, modulation, systems.In Account, we overview different strategies based rule, including fluorescence-selective absorption, circularly reflection, energy transfer (CPF-ET). Examples these illustrated focus helical polymers light appealing structures wide uses. instance, can convert racemic into one specific handedness simply overlapping polymer's circular dichroism (CD) spectra luminophore's emission spectra. employing selective reflection certain handedness's light, twisting power (HTP) polymer cholesteric liquid crystals (N*-LCs) gives glum. Additionally, CPF-ET, only spectrum donor absorption (or excitation) acceptor required overlap, no between two required. An outlook materials related which will avail optimization extension intriguing approach concludes Account. We hope Account offer insightful inspiration flourishing progress present exciting opportunities.

Язык: Английский

---

Strong Magnetically‐Responsive Circularly Polarized Phosphorescence and X‐Ray Scintillation in Ultrarobust Mn(II)–Organic Helical Chains

Advanced Materials, Год журнала: 2023, Номер 35(35)

Опубликована: Июнь 26, 2023

Over recent years, Mn(II)-organic materials showing circularly polarized luminescence (CPL) have attracted great interest because of their eco-friendliness, cheapness, and room temperature phosphorescence. Using the helicity design strategy, herein, chiral helical polymers are constructed featuring long-lived phosphorescence with exceptionally high glum ΦPL magnitudes 0.021% 89%, respectively, while remaining ultrarobust toward humidity, temperature, X-rays. Equally important, it is disclosed for first time that magnetic field has a remarkably negative effect on CPL Mn(II) materials, suppressing signal by 4.2-times at B⃗$\vec{B}$ = 1.6 T. designed UV-pumped light-emitting diodes fabricated, demonstrating enhanced optical selectivity under right- left-handed polarization conditions. On top all this, reported display bright triboluminescence excellent X-ray scintillation activity perfectly linear dose rate response up to 174 µGyair s-1 . Overall, these observations significantly contribute phenomenon multi-spin compounds promote highly efficient stable Mn(II)-based emitters.

Язык: Английский

---

Synthesis and Application of Fluorescent Polymer Micro‐ and Nanoparticles

Small, Год журнала: 2023, Номер 19(26)

Опубликована: Март 21, 2023

Abstract Fluorescent polymer particles have witnessed an increasing interest in recent years, owing to their fascinating physicochemical properties as well wide‐ranging applications. In this review, the state‐of‐the‐art research progress of fluorescent past five years is summarized. First, synthesis protocols for particles, including emulsion polymerization, precipitation dispersion suspension nanoprecipitation, self‐assembly, and post‐polymerization modification, are presented detail. Then, applications resulting beguiling anticounterfeiting, chemical sensing, biomedicine, illustrated. Finally, challenges opportunities that exist field pointed out. This review aims offer important guidance stimulate more attention rapidly developing field.

Язык: Английский

---

Strong and Multicolor‐Tunable Pure Organic Circularly Polarized Room‐Temperature Phosphorescence from Cholesteric Liquid Crystal

Advanced Optical Materials, Год журнала: 2023, Номер 11(21)

Опубликована: Июнь 25, 2023

Abstract Pure organic circularly polarized room‐temperature phosphorescence (CPRTP) materials show significant promise for applications in advanced anti‐counterfeiting, biological imaging, and so on. However, it remains challenging to prepare CPRTP with a high luminescence dissymmetry factor (g lum ). This article provides simple efficient method pure g from cholesteric liquid crystals by incorporation of achiral phosphorescent chromophore dibenzofuran into chiral cholesterol mesogen via flexible spacer. The findings that the synthetic compound Chol‐C6‐DF can form effectively amplify value through selective reflection. film produce yellow when excited chromophore. value, lifetime, quantum yield produced under excitation 380 nm light are −0.19, 567.7 ms, 3.2%, respectively. Even more interesting is also exhibits RTP clustering‐triggered emission characteristics. lifetime red 420 ‐0.11 1.11 s. Under 410, 430, 470 light, yields 19.0%, 20.2%, 19.1%,

Язык: Английский

---

Chiral TADF Polymers Realizing Highly‐Efficient Deep‐Red Circularly Polarized Electroluminescence Over 660 nm

Advanced Optical Materials, Год журнала: 2023, Номер 11(19)

Опубликована: Май 8, 2023

Abstract Circularly polarized electroluminescence (CPEL) from thermally activated delayed fluorescence (TADF) emitters have been widely reported in recent years. However, a universal strategy for designing deep‐red chiral TADF is still unexplored. Herein, to address the problem, pair of donor intermediates are designed and synthesized preparing emitters, two novel polymers R‐P S‐P developed through this strategy. The exhibit intense mirror‐image circularly luminescence (CPL) signals toluene dilute solution. Besides, series solution‐processed polymer light‐emitting diode (CP‐PLED) devices fabricated with . corresponding achieve persuasive performance external quantum efficiencies (EQEs) 6.2% 5.8% at wavelength 662 nm, respectively. CPEL detected dissymmetry factors (gEL) +1.6 × 10 −3 −1.7 CP‐PLED devices,

Язык: Английский

---

High Comprehensive Circularly Polarized Electroluminescence Performance Improved by Chiral Coassembled Host Materials

Advanced Functional Materials, Год журнала: 2023, Номер 33(44)

Опубликована: Авг. 29, 2023

Abstract Circularly polarized organic light‐emitting diodes are of great significance in 3D displays. However, achieving circularly electroluminescence (CP‐EL) simultaneously with a large dissymmetry factor ( g EL ) and high efficiency still remains formidable challenge. Herein, facile efficient strategy is developed for improving the performance CP‐EL devices using device emitting layers chiral coassembled helix nanofiber host materials. Chiral materials (( S ‐/ R ‐2Cz) 0.2 ‐(PFpy) 0.8 could be smartly constructed through intermolecular π–π stacking interactions between achiral conjugated pyridine‐based polymer acceptor (PFpy) binaphthyl‐based donor ‐2Cz). Significantly, resulting hosts greatly promote commercially available phosphorescence emitter to achieve solution‐processed red performances at 620 nm external quantum 4.1% | value 0.014.

Язык: Английский

---

Aqueous Circularly Polarized Luminescence Induced by Homopolypeptide Self-Assembly

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(50), С. 27282 - 27294

Опубликована: Дек. 8, 2023

Remarkable advances have been achieved in solution self-assembly of polypeptides from the perspective nanostructures, mechanisms, and applications. Despite intrinsic chirality polypeptides, promising generation aqueous circularly polarized luminescence (CPL) based on their has rarely reported due to weak fluorescence most indeterminate mechanism. Here, we propose a facile strategy for achieving CPL simple homopolypeptides modified with terminal group featuring both twisted intramolecular charge transfer aggregation-induced emission properties. A morphology-dependent can be observed under different conditions by altering solvents. nanotoroid-dispersed detectable obtained using tetrahydrofuran as good solvent self-assembly, which is attributed involvement chiral environment formed homopolypeptide chains. However, such packing mode cannot realized nanorods self-assembled dioxane, resulting an inactive phenomenon. Furthermore, signals greatly amplified co-assembly achiral small molecule derived group. This work not only provides pathway construct CPL-active nanomaterials but also reveals potential mechanism production, transfer, amplification polypeptide-based nanostructures.

Язык: Английский

---