Hemoglobin Inhibition of Superoxide Radical and Holes‐Induced Photobleaching in Zn₂GeO₄:Mn Long‐Afterglow Nanorods for Tracking of Bloodstains

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Abstract The photobleaching of fluorophores is usually seen as harmful in optical sensing and bioimaging it leads to a loss or permanent drop their photoluminescence (PL) due structural damage from prolonged light exposure. Here, this study reveals the fluorescence intensity long‐afterglow performance Mn 2+ ‐doped Zn₂GeO₄ nanorods (ZGO:Mn NRs) exhibit significant degradation under irradiation, but integrity remains largely unaffected. This phenomenon arises partially static quenching caused by adsorption superoxide radicals (•O 2 − ), which form photoelectrons transfer surface‐adsorbed oxygen molecules. Concurrently, accumulation residual photogenerated holes promotes non‐radiative relaxation pathways excited state ZGO:Mn NRs, thereby suppressing radiative recombination diminishing luminescence efficiency. Notably, hemoglobin (HGB) catalyzes scavenging •O photoinduced holes, enabling rapid restoration long‐persistent NRs. specific response offers simple strategy for detecting HGB, showing superior sensitivity anti‐interference ability visualizing latent bloodstains on various material surfaces. research will further develop advanced luminescent materials explore applications biosensing, environmental monitoring, trace evidence analysis.

Language: Английский

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Progress in Polymer‐Based Pure Organic Room Temperature Phosphorescent Materials

Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown

Published: April 23, 2025

Abstract To date, organic room‐temperature phosphorescent (RTP) materials have received much attention due to their long lifetime and large Stokes shift, been widely used in anti‐counterfeiting encryption, bio‐imaging, sensing monitoring. Researchers a variety of approaches construct ultra‐long, efficient RTP materials, with the confinement chromophores polymers being favored improve performance. The polymer entanglement structure restricts vibration rotation chromophore, which successfully suppresses non‐radiative excitation triplet exciton protects from external environment (oxygen, water), is conducive realization ultra‐long bright emission, makes material easy process, broadens application range material. This review summarizes recent advances study polymeric underlying mechanisms design strategies, discusses properties amorphous crystalline respectively, as well latest applications polymers, finally challenges for development outlook future.

Language: Английский

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Axial chirality-induced rigidification in aminoboranes enhances persistent room-temperature phosphorescence and circularly polarized luminescence

Communications Chemistry, Journal Year: 2025, Volume and Issue: 8(1)

Published: April 25, 2025

Long-lived triplet exciton harvesting materials are of immense interest for applications in bioimaging, optoelectronics, anticounterfeiting, and sensing. However, achieving persistent room-temperature phosphorescence (pRTP) metal-free systems remains a significant challenge. Herein, we present purely organic axially chiral aminoboranes (R/S-(BN)₂) with enhanced pRTP properties circularly polarized luminescence (CPL). By introducing axial chirality, the dual-core system achieves steric-hindrance-caused rigidity, which restricts molecular motions, leading to superior properties. Notably, R-(BN)₂ demonstrates quantum yield (ΦP) 9.2% (S-(BN)₂ : ΦP = 8.7%) an extended lifetime 0.9 sec at room temperature, significantly outperforming its mono-core counterpart (BN)₁ (ΦP 3.0% τP 0.6 s). Theoretical analysis corroborates observed improvements, revealing synergistic role borylation chirality stabilizing states. Furthermore, exhibited CPL dichloromethane solutions dissymmetry factor ~10-3. These findings highlight potential frameworks designing efficient materials, as demonstrated security writing application, further paving way their use anti-counterfeiting technologies, next-generation electronics.

Language: Английский

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Multi-colour room-temperature phosphorescence from fused-ring compounds for dynamic anti-counterfeiting applications

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(30), P. 4060 - 4063

Published: Jan. 1, 2024

We present a facile strategy to achieve purely organic multi-colour room-temperature phosphorescence (RTP) films by doping typical fused-ring compounds into poly(vinyl alcohol) matrix.

Language: Английский

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Enhanced Photoactivated Circularly Polarized Afterglow with High Dissymmetry Factor and Tunable Emission

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Abstract Photoactivated circularly polarized afterglow (CPA) exhibits broad application prospects in various optoelectronic areas due to its multidimensional emission characteristics, including wavelengths, lifetimes, and chirality. Achieving photoactivated CPA with extremely high dissymmetry factor ( g lum ) values is highly desired but considerably challenging. This work reports a bilayer assembly (R/S‐CLC‐TPB) integrating TPB@PMMA thin film the selective reflection of cholesteric liquid crystals. Initially, R/S‐CLC‐TPB no emission, while following 1 min UV irradiation, it achieves an noticeable long lifetime 125 ms value up 1.6. enhancement can be attributed oxygen consumption properties under subsequently minimizing loss triplet exciton. Furthermore, by employing triplet‐singlet Förster resonance energy transfer (TS‐FRET) strategy from organic persistent room‐temperature phosphorescence donor fluorescent dye acceptor, color successfully modulated green orange. Ultimately, these materials demonstrate promising capabilities for advanced multi‐level information encryption utilizing their tunable color, create multiple layers that selectively accessed decoded based on photoactivation chiroptical properties.

Language: Английский

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