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Engineering Tunable Broadband Near-Infrared Emission in Transparent Rare-Earth Doped Nanocrystals-in-Glass Composites via a Bottom-Up Strategy
摘要： Applications of trivalent rare earth (RE3+)-doped light sources in solid-state laser technology, optical communications, biolabeling, and solar energy management have stimulated a growing demand for broadband emission with flexible tunability and high efficiency. Codoping is a conventional strategy for manipulating the photoluminescence of active RE3+ ions. However, energy transfer between sensitizers and activators usually induces nonradiative migration depletion that brings detrimental luminescent quenching. Here, a transparent framework is employed to assemble ordered RE3+-doped emitters to extend the emission spectral range by extracting photons from a variety of RE3+ ions with sequential energy gradient. To block migration-mediated depletion between different RE3+ ions, a nanoscopic heterogeneous architecture is constructed to spatially confine the RE3+ clusters via a 'nanocrystals-in-glass composite' (NGC) structure. This bottom-up strategy endows the obtained RE3+-doped NGC with high emission intensity (nearly one order of magnitude enhancement) and broadband near-infrared emission from 1300 to 1600 nm, which covers nearly the whole low-loss optical communication window. Most crucially, NGC is a versatile approach to design tunable broadband emission for the potential applications in high-performance photonic devices, which also provides new opportunities for engineering multifunctional materials by integration and manipulation of diverse functional building units in a nanoscopic region.
关键词： luminescence,rare earth doping,broadband emission,nanocrystals-in-glass composite,near-infrared emission
更新于2025-09-23 15:22:29
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Design of lanthanide-based metal-organic frameworks with enhanced near-infrared emission
摘要： A strategy based on the use of ligand steric hindrance and metal doping is reported for the design and synthesis of near-infrared (NIR) emitting lanthanide-based metal–organic frameworks (MOFs). The lanthanide ions are free of coordinated solvents, and the resulting NIR-MOFs are highly emissive and exhibit long luminescence lifetimes.
关键词： metal doping,ligand steric hindrance,lanthanide-based metal–organic frameworks,luminescence,near-infrared emission
更新于2025-09-23 15:21:01
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Molecular isomeric engineering of naphthyl-quinoline-containing dinuclear platinum complexes to tune emission from deep red to near infrared
摘要： Four isomeric dinuclear platinum complexes of (C^N)2Pt2(m-OXT)2 are synthesized and characterized with different C^N cyclometalating ligands and the same ancillary ligand of 5-(4-octylphenyl)-1,3,4-oxadiazole-2-thiol (m-OXT). These isomeric C^N ligands are 1-naphthyl-1-isoquinoline (niq), 2-naphthyl-1-isoquinoline (2niq), 1-naphthyl-2-quinoline (nq) and 2-naphthyl-2-quinoline (2nq). The isomeric effect on the photophysical, electrochemical and electroluminescence properties of (C^N)2Pt2(m-OXT)2 was systematically studied. It is found that the emissions were easy to tune from deep red to near infrared for (C^N)2Pt2(m-OXT)2 by changing the C^N isomers. Furthermore, the complexes with 2-naphthyl in these presented better electroluminescence (EL) properties than the complexes with 1-naphthyl. In contrast to the (2nq)2Pt2(l-OXT)2-doped devices displaying a deep-red emission peaked at 686 nm with an external quantum efficiency (EQE) of 3.21%, the (2niq)2Pt2(l-OXT)2-doped devices exhibited a near-infrared emission peaked at 704 nm with a significantly increased EQE of 8.86% and a radiant emittance of 986 mW cm?2. Our research provides an efficient strategy to tune emission from deep red to near infrared by a simple isomeric engineering of dinuclear platinum(II) complexes.
关键词： deep red emission,isomeric engineering,near infrared emission,dinuclear platinum complexes,electroluminescence
更新于2025-09-19 17:15:36
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Reviving Neara??Infrared Emission for Sna??Pb Alloyed Perovskite Quantum Dots by Sodium Doping
摘要： Phase-stable CsSnxPb1-xI3 perovskite quantum dots (QDs) hold great promise for optoelectronic applications owing to their strong response in the near-infrared region. Unfortunately, optimal utilization of their potential is limited by severe photoluminescence (PL) quenching, leading to extremely low quantum yields (QYs) of ~0.3%. Ultra-low sodium (Na) doping presented in this work is found to be effective in improving PL QYs of these alloyed QDs without alerting their favorable electronic structure. X-ray photoelectron spectroscopy (XPS) studies suggest the formation of a stronger chemical interaction between I- and Sn2+ ions upon Na doping, which potentially helps to stabilize Sn2+ and suppresses the formation of I vacancy defects. The optimized PL QY of the Na-doped QDs reaches up to ~28%, almost two orders of magnitude enhancement compared with the pristine one.
关键词： doping,near-infrared emission,nanoparticles,tin-lead perovskite
更新于2025-09-19 17:13:59
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Reviving Near-Infrared Emission for Sn-Pb Alloyed Perovskite Quantum Dots by Sodium Doping
摘要： Phase-stable CsSnxPb1-xI3 perovskite quantum dots (QDs) hold great promise for optoelectronic applications owing to their strong response in the near-infrared region. Unfortunately, optimal utilization of their potential is limited by severe photoluminescence (PL) quenching, leading to extremely low quantum yields (QYs) of ~0.3%. Ultra-low sodium (Na) doping presented in this work is found to be effective in improving PL QYs of these alloyed QDs without alerting their favorable electronic structure. X-ray photoelectron spectroscopy (XPS) studies suggest the formation of a stronger chemical interaction between I- and Sn2+ ions upon Na doping, which potentially helps to stabilize Sn2+ and suppresses the formation of I vacancy defects. The optimized PL QY of the Na-doped QDs reaches up to ~28%, almost two orders of magnitude enhancement compared with the pristine one.
关键词： doping,near-infrared emission,nanoparticles,tin-lead perovskite
更新于2025-09-16 10:30:52
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Biocompatible off-stoichiometric copper indium sulfide quantum dots with tunable near-infrared emission <i>via</i> aqueous based synthesis
摘要： The present study reports an aqueous synthesis approach towards off-stoichiometric copper indium sulfide quantum dots with emissions in the near-infrared spectral range. The photoluminescence properties of the dots, and in particular the appearance of dual emission at high Cu deficiency, were studied with temperature-dependent steady-state and transient photoluminescence spectroscopy.
关键词： aqueous synthesis,copper indium sulfide,quantum dots,near-infrared emission,photoluminescence
更新于2025-09-12 10:27:22
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Boosting Efficiency of Near‐Infrared Organic Light‐Emitting Diodes with Os(II)‐Based Pyrazinyl Azolate Emitters
摘要： Tremendous effort has been devoted to developing novel near-infrared (NIR) emitters and to improving the performance of NIR organic light-emitting diodes (OLEDs). Os(II) complexes are known to be an important class of NIR electroluminescent materials. However, the highest external quantum efficiency achieved so far for Os(II)-based NIR OLEDs with an emission peak wavelength exceeding 700 nm is still lower than 3%. A new series of Os(II) complexes (1–4) based on functional pyrazinyl azolate chelates and dimethyl(phenyl)phosphane ancillaries is presented. The reduced metal-to-ligand charge transfer (MLCT) transition energy gap of pyrazinyl units in the excited states results in efficient NIR emission for this class of metal complexes. Consequently, NIR OLEDs based on 1–4 show excellent device performance, among which complex 4 with a triazolate fragment gives superior performance with maximum external quantum efficiency of 11.5% at peak wavelength of 710 nm, which represent the best Os(II)-based NIR-emitting OLEDs with peak maxima exceeding 700 nm.
关键词： N-donor,phosphorescence,osmium,near-infrared emission,organic light-emitting diodes
更新于2025-09-11 14:15:04
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A near-infrared fluorescent probe based on SNAr reaction for H2S/GSH detection in living cells and zebrafish
摘要： Hydrogen sulfide (H2S) and biothiols such as cysteine (Cys), homocysteine (Hcy) and glutathione (GSH), play critical roles in physiological and pathological processes. However, due to the challenge in sensing H2S and biothiols simultaneously, it is of great importance to solve this problem in biological processes. Herein, a near-infrared fluorescent probe (HZ-NBD) based on SNAr reactions was exploited to achieve the sensitive and selective detection of H2S and glutathione (GSH) simultaneously in the same conditions. The design strategy was employing dicyanoisophorone based fluorescent dye as the fluorophore, the NBD moiety as a response unit and a quencher of fluorophore. The probe exhibited a low limit of detection to H2S (13.2 nM) and GSH (112 nM) as well as a favorable large stokes shift (112 nm). The reaction mechanism was investigated via mass spectra. What’s more, owing to the advantages of low cytotoxicity, fast response and strong anti-interference ability, the probe HZ-NBD was successfully applied to bioimage H2S and GSH in HepG2 cells and zebrafish.
关键词： fluorescent probe,SNAr,dicyanoisophorone,near-infrared emission
更新于2025-09-10 09:29:36
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Dicyanoisophorone-Based Near-Infrared Emission Fluorescent Probe for Detecting NAD(P)H in Living Cells and <i>in Vivo</i>
摘要： NADH and NADPH are ubiquitous coenzymes in all living cells and play vital roles in numerous redox reactions in cellular energy metabolism. To accurately detect the distribution and dynamic changes of NAD(P)H under physiological condition is essential for understanding its biological functions and pathological roles. In this work, we developed a near-infrared (NIR) emission fluorescent small-molecule probe (DCI-MQ) composed of a dicyanoisophorone chromophore conjugated with a quinolinium moiety for in vivo NAD(P)H detection. DCI-MQ owns the advantages of high water solubility, rapid response, extraordinary selectivity, great sensitivity (detection limit of 12 nM), low cytotoxicity and a NIR emission (660 nm) in response to NAD(P)H. Moreover, the probe DCI-MQ was successfully applied for the detection and imaging of endogenous NAD(P)H in both living cells and tumor-bearing mice, which provides an effective tool for the study of NAD(P)H-related physiological and pathological processes.
关键词： NAD(P)H,near-infrared emission,fluorescent probe,bioimaging,dicyanoisophorone
更新于2025-09-04 15:30:14