New functional metal–organic framework (MOF) based optical thermometer by the post-synthesis doping rare earth ions into MOF

Chinese Chemical Letters, Journal Year: 2025, Volume and Issue: unknown, P. 111085 - 111085

Published: March 1, 2025

Language: Английский

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Engineering Solvent‐Coordinated Heterometallic–Organic Frameworks for Wide‐Range Tuning of Ultralong Room Temperature Phosphorescence toward Time‐Resolved Anticounterfeiting

Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Abstract Metal–organic frameworks (MOFs) have been proven promising ultralong room temperature phosphorescence (RTP) materials for anticounterfeit due to their unique optical properties. However, it remains a major challenge achieve the desired phosphorescent properties limited regulatory methods and indistinct mechanism. Herein, coordination solvent second metal ion costrategy is firstly proposed prepare seven robust heterometallic–organic (HMOFs) with two configurations, ZnMg/Ca‐sol [sol = H 2 O, dimethylformamide (DMF), dimethylacetamide (DMA), formyldiethylamine (DEF)] ZnSr/Ba‐H O , exhibiting different RTP. The tunable lifetimes within 14.5–195.4 ms are achieved gradually by altering type of alkaline earth metals, solvent, hydrogen‐bonding in HMOFs. Significantly, theoretical calculations reveal that promotion spin–orbit coupling heavy metals rigid constraint on skeleton result excellent balance between high quantum yield ( Ф P ) long lifetime, especially ZnSr‐H (6.8%, 195.4 ms). Depending wide‐range tuning RTP great stability, HMOFs successfully applied spatial‐time resolved anticounterfeiting multilevel information encryption. This work may provide new approach designing target while resolving contradiction lifetime.

Language: Английский

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Multi‐Stimuli‐Responsive Circularly Polarized Luminescence with Handedness Inversion and Near‐Infrared Phosphorescence in Chiral Metal‐Organic Framework Platform for White Light Emission and Information Encryption

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Abstract Preparing multi‐color and multi‐stimuli‐responsive circularly polarized luminescence (CPL) materials understanding the evolution of chirality through visualized mode is still a challenge. Here, an encapsulation engineering approach chiral metal‐organic frameworks (MOFs) proposed to confine guest emitters realize CPL. Based on triplet‐triplet energy transfer (TTET), white CPL near‐infrared room temperature phosphorescence (NIR‐CPRTP) can be obtained by introducing pyrene derivatives. With introduction containing vinylpyrene group, light‐ thermal‐responsive with signal inversion realized reversible [2+2] cycloaddition reaction between ligand triggered visible light/ultraviolet light or heating. Furthermore, excitation‐dependent successfully achieved incorporation excited state intramolecular proton (ESIPT) molecules into nanopores. Importantly, magnification greatly enhanced spatial confinement, accurate host‐guest single crystal structures FLT@DCF‐12 FLT@LCF‐12 provide understand mechanism transfer, amplification responsiveness. White LED multiple information display encryption are further demonstrated. This breakthrough provides new perspective guest‐encapsulated MOFs contributes construction stimuli‐responsive CPL‐active materials.

Language: Английский

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Hierarchical Chirality Transfer and Amplification within Conjugated Helical Polymers for Efficient Circularly Polarized Organic Light-Emitting Diodes and Photodetectors

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Circularly polarized organic light-emitting diodes (CP-OLEDs) and CP photodetectors have received enormous attention owing to their promising potential in light-related technologies. The simultaneous construction of efficient CP-OLEDs using the multifunctionality same chiral material remains be explored. Herein, achiral conjugated polymer poly(9,9-dioctylfluorene) (PFO) is used for coassembly with helical polyacetylenes. resulting emitters can achieve high-performance circularly electroluminescence (CPEL) a large dissymmetry factor (gEL) 0.11 high brightness 9035 cd m-2. By introducing flexible substrate into device, are realized. Additionally, such serve as photoactive layer photodetector detect light, maximum photocurrent (gph) order 10-1. This work provides route realize factors polyfluorene polymer, facilitating comprehensive versatile development.

Language: Английский

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Highly CPL-active materials via columnar self-assembly of R-BINOL-cyanostilbene derivatives

Dyes and Pigments, Journal Year: 2025, Volume and Issue: unknown, P. 112858 - 112858

Published: April 1, 2025

Language: Английский

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Solution‐Processable Metal‐Organic Framework Featuring Highly Tunable Dynamic Aggregation States

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 2, 2024

Abstract The limited processability of metal‐organic frameworks (MOFs) is hindered flexibility in the manipulation their aggregation state and applications. Therefore, achieving highly processable MOFs great significance but a challenging goal. Herein, facile strategy presented for construction solution‐processable Mg‐based MOF, NKU‐Mg‐1 , allowing dynamic control through self‐assembly (DySA) process reversible circularly polarized luminescence (CPL) switcher modulation. Notably, micron‐sized crystals can be readily dispersed water to form nano‐sized colloids, triggered by COO‐Mg coordination bonding interruption competitive H 2 O‐Mg bonding. Accordingly, colloid MOF tuned from 50–80 nm up 1000 nm, turn enabling aggregation‐dependent emission. Specially, solid‐phase controlled via structural transitions between 3D NKU‐Mg‐1‐rec‐1 2D NKU‐Mg‐1‐rec‐2 nano‐crystals, as confirmed electron diffraction. Furthermore, benefiting its tunable nature, rational incorporation chiral module confers significant CPL activity (g lum 0.01). Importantly, controllable enables switching precisely regulating states. aggregation‐tunable features endow it promising

Language: Английский

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Synergic Effect between La-Mof and Mxene: Revolutionizing Tpu with Improved Mechanical Strength and Fire Safety

Published: Jan. 1, 2024

Language: Английский

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Ionic Hydrogen-Bonded Organic Frameworks with a Two-Photon Synergistic Color Change and Their Information Encryption Applications

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(43), P. 58931 - 58939

Published: Oct. 18, 2024

Photochromic hydrogen-bonded organic frameworks (HOFs) can introduce different luminescent functional groups to achieve synergistic controlled multiple color change properties, which are in great demand for diverse information encryption applications. We report this paper switchable photochromic and photoluminescent dual group HOFs constructed with effects by N,N′-bis(2-phenylalanine)-1,4,5,8-naphthalenediimine (H2PheNDI) benzenecarboximidamide 4,4′-azobis(hydrochloride) (AZBH). The crystal powder of iHOF-41 is orange–red color, be changed black under the irradiation a 365 nm ultraviolet (UV) light source 15 min. photoisomerization rate solution continuous UV 5 h was close 99%. composite membranes properties photochromism photoluminescence when they discolored and, at same time, excite red bright fluorescence. This work achieves construction based on switching biluminescent explores mechanism process as well its practical application encryption.

Language: Английский

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Fluorescent Dye‐Based Chiral Crystalline Organic Salt Networks for Circularly Polarized Luminescence

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 24, 2024

Abstract A facile and general strategy is developed herein for the construction of circularly polarized luminescence (CPL) materials with simultaneously high fluorescence quantum efficiency (Φ) large dissymmetry factor (g lum ). The self‐assembly fluorescent dye, disodium 4,4′‐bis(2‐sulfonatostyryl)biphenyl (CBS), chiral diamines such as (R,R)/(S,S)‐1,2‐diaminocyclohexane (R/S‐DACH) R/S‐1,2‐diaminopropane (R/S‐DAP), produces four crystalline organic salt networks (COSNs). These as‐synthesized salts emit strong blue‐color CPL upon excitation, both Φ g values up to 79% 0.022. well‐defined molecular structures arrangements CBS are directly observed through single crystal X‐ray analysis, offering crucial information regarding origins high‐efficiency performance. chirality amine effectively transferred further amplified supramolecular structure by multiple hydrogen bonding π–π stacking interactions, giving rise factors; meanwhile, fixation ordered arrangement these interactions empower efficient suppression motions, facilitating fluorescence. This work can inspire assembly via charge‐assisted bonds between dyes inducers. It also offers important insight into structural

Language: Английский

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Enhanced Circularly Polarized Luminescence Modulation Using Dichroic Conjugated Polymer in Cholesteric Liquid Crystals

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 25, 2024

Abstract Negative dichroic dyes are crucial for enhancing the brightness of liquid crystal displays (LCDs) and modulating circularly polarized luminescence (CPL) in cholesteric crystals (CLCs) through supramolecular co‐assembly. However, majority fluorescent molecules exhibit positive dichroism, there is a limited understanding designing negative molecules. In this paper, novel design principle proposed to construct polymer by introducing space charge transfer (TSCT) side chain structure backbone. Specifically, two conjugated polymers (P1, P2) synthesized using Suzuki coupling reaction donor‐acceptor (D‐A) type monomers (V‐type M1 I‐type M2) with fluorenyl monomer. P1 exhibits its orientational order parameter (S F ) up S FP1 = –0.18. On contrary, P2 dichroism ( FP2 + 0.27). This variation arises from differing orientations rigidly functional chains FM1 0.07; FM2 0.31), which affect alignment (parallel or perpendicular) backbone toward CLCs phenomenon facilitates controllable precisely modulates handedness CPL signals, thereby facilitating successful implementation multidimensional information encryption systems CLCs.

Language: Английский

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