Journal of Materials Chemistry C
·
2025
·
IF 5.1
Ya Wang,Min Chen,Manning Hu,Anxin Jiao,Faxin Wang,Xiaolong Zheng,Wanqing Li,Xin Tang,Huicheng Hu
Lead selenide (PbSe) colloidal quantum dots (CQDs) are promising candidates for short-wave infrared (SWIR) photodetectors due to their low-cost fabrication and solution processability. However, conventional ligand exchange strategies, such as treatment with 1,2-ethanedithiol (EDT), usually lead to incomplete defect passivation and undesirable doping characteristics. Here, we developed a hybrid-ligand strategy by combining EDT and zinc iodide (ZnI2) to simultaneously passivate surface defects and modulate the doping type of PbSe CQD films. As a result, the photodetector responsivity improves from 0.04 A W−1 to 0.40 A W−1, and the specific detectivity increases from 3.4 × 1010 Jones to 2.8 × 1011 Jones at 500 Hz under zero bias. The optimized device exhibits a wide linear dynamic range exceeding 114 dB and a fast response time of 7.3 μs. Finally, the infrared imaging applications of PbSe CQD photodetectors were successfully demonstrated. This work highlights the importance of synergistic surface passivation and doping modulation in enhancing the performance of CQD photodetectors.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Qi Chen,Fang Lei,Ying Shi
Perovskite light-emitting diodes (PeLEDs) employing CsPbX 3 nanocrystals (NCs) face persistent challenges in balancing emission efficiency and spectral stability due to surface halide vacancies, which trigger nonradiative recombination, halide phase segregation, and self-doping effects. In this work, we address these limitations by introducing 3,5-dicarboxyphenylboronic acid (3,5-DA) as a multifunctional bidentate ligand additive. The unique coordination architecture of 3,5-DA, featuring multiple chelating groups, enables strong binding affinity to perovskite NC surfaces. This interaction effectively passivates halide vacancies while suppressing ion migration and defect formation. The optimized CsPb(Br/I) 3 NCs exhibit enhanced stability and suppressed nonradiative losses, enabling high-performance white LEDs (WLEDs). At a driving current of 10 mA, the fabricated WLEDs demonstrate a luminous efficiency of 10.32 lm·W −1 , a CIE coordinate of (0.3379, 0.3391), a correlated color temperature (CCT) of 5260 K, and an external quantum efficiency (EQE) of 6.48 %. This work provides a ligand engineering strategy to concurrently resolve efficiency-stability trade-offs in PeLEDs.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xue-Hui Shi,Zhendong Zhu,Changlin Shen,Ya Li,Zhuang Qian,Yonghao Wu,Huifeng Chen,Qing-Qing Ye,Chaojie Hu,Yifan Song,Lei Wang,Zhimou Yang,Wenjie Ren
Fluorescent semiconductor quantum dots (QDs) had the potential to revolutionize biological imaging, but their applications were limited by the difficulties of obtaining biocompatible and high fluorescent-quality QDs due to the difficulty in manipulating surface properties. Here, we explored a facile and effective ligand exchange approach, which enabled sequential surface functionalization and phase transfer of QDs while maintaining QDs fluorescence intensity, size and morphology. Nitrosonium tetrafluoroborate (NOBF 4 ) was employed to substitute for the original organic ligands attached to the QDs surface, stabilizing the QDs in polar and hydrophilic media N , N -dimethylformamide for 60 days without aggregation or precipitation. This method was applicable to a wide range of QDs of different compositions, fluorescence emission wavelengths and sizes. The obtained hydrophilic QDs can subsequently be further functionalized with various capping molecules, which can endow the different surface functionalization of QDs according to the modified molecules employed. Among these, Ag 2 Te QDs after NOBF 4 treatment could undergo sequential surface functionalization, which achieved high-quality in vivo fluorescent imaging. This work offered a versatile ligand exchange strategy for QDs surface functionalization and was a significant step toward controllably engineering the QDs surface properties.
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ELECTROCHIMICA ACTA
·
2025
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IF 5.6
Haoqi Liang,Yutong Yang,Yijia Wang,Zejun Deng
Escalating aquatic contamination by toxic heavy metal ions (HMIs) urgently requires field-deployable electrochemical sensors surpassing traditional methods. This work proposed a controllable synthesis of cobalt-embedded nitrogen-doped carbon/carboxyl-functionalized multi-walled carbon nanotube (Co@NC/CMWCNTs) composites through in situ growth of ZIF-67 on CMWCNTs, followed by optimized carbonization. CMWCNTs-directed morphological evolution was systematically demonstrated, revealing that with increasing CMWCNT ratios, the ZIF-67 crystallite size underwent an initial increase and later decay, and after carbonization, a unique knot-like interpenetrating architecture was formed with CMWCNTs as bridges and Co@NC as nodes. This synergistic structure significantly enhanced electrical conductivity and electrocatalytic activity, as evidenced by electrochemical characterization. Compared to the glassy carbon electrode (GCE), the Co@NC/CMWCNTs/GCE sensor exhibited a 12-fold reduction in charge transfer resistance (28.3 Ω vs. 346.8 Ω), a 21% larger electroactive surface area, and rapid heterogeneous electron transfer kinetics of 3.8 × 10⁻³ cm s -1 . The composite sensor allowed simultaneous detection of Cd²⁺, Pb²⁺, Cu²⁺, and Hg²⁺ in 0.1 M NaAc-HAc buffer (pH 4.5) with high sensitivities (169.7, 199.0, 135.9 and 108.0 μA·μM⁻¹ cm -2 ), low detection limits (40.0, 40.5, 87.5 and 106.2 nM) and observed cross-interference within 10%. This work establishes a materials design paradigm for MOF-derived electrochemical sensors for low-cost on-site environmental monitoring of HMIs.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Zhenzhen Xie,Wei Jia,Xingzhen Li,Lei Pan,Shihao Xu,Changlong Jiang
Cadmium ion (Cd 2+ ) pollution poses severe environmental and health risks due to its high toxicity, bioaccumulation potential, and persistence. Although traditional detection methods require bulky instruments and complex procedures, limiting the suitability for rapid on-site analysis. The paper introduces aptamer-based fluorescent probes and double-stranded fluorescent probe based on an aptamer and its complementary DNA (cDNA). The former is composed of aptamers and SYBR Green dyes. The detection range of Cd 2+ is 0–8 μM, and limit of detection (LOD) is 15 nM. The probe consists of a double-stranded structure formed by a 5′-FAM-labeled Cd 2+ aptamer and a 3′-BHQ1-modified cDNA. By combining this probe with a hydrogel matrix, a smartphone-based sensing platform is constructed, which enables highly sensitive and convenient detection of Cd 2+ . It indicated that the detection range of the probe for Cd 2+ is 0–50 μM, with the LOD of 27.6 nM. Molecular dynamics simulations (MD) disclosed the binding mechanism of the aptamer and Cd 2+ : the specific recognition by nucleobases such as G9, C12, and T17 in the Coulomb force-driven double-twisted folding conformation plays a crucial role. Further integrating the probe into the hydrogel matrix constructed the dsDNA@hydrogel platform successfully achieved real-time visual detection of Cd 2+ in environmental samples. It not only offers a highly sensitive and cost-effective new approach for heavy metal detection, but promotes the advancement of portable environmental monitoring technologies through the innovation of the aptamer-hydrogel system.
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OPTICS EXPRESS
·
2025
·Vol. 33
·期 12
·25069-25079
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IF 3.3
Qiurui Zhang,Pei Xiang,Juqing Li,Jincheng Lei
Perovskite quantum dots (QDs) have attracted great attention due to their tunable bandgap and emission wavelength, which can be adjusted by simply modifying the halide composition. However, it is still a challenge to achieve precise control of the composition of perovskite QDs due to the rapid and uncontrollable reactions. Herein, a laser-driven anion exchange method is developed to achieve precise control on the composition of perovskite QDs and optical properties. By adjusting the laser power density, the emission wavelength of the films can be continuously tuned from 414 to 648 nm. Sandwich and heterojunction structures are successfully fabricated by controlling the position of the laser spot irradiation. Furthermore, this method can fabricate films with a smooth, dense particle surface morphology, which provides potential applications in fields such as full-color displays and solar cells. The long-term stability of perovskite QDs films is achieved by using encapsulation technology, with excellent optical stability even after 50 days of immersion in water.
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ACS Nano
·
2025
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IF 16
Jianqiang Xiao,Kai Yin,Lingxiao Wang,Jiaqing Pei,Xinghao Song,Yin Huang,Jun He,Ji-An Duan
Perovskite quantum dots (QDs) have emerged as revolutionary materials for next-generation display technologies due to their tunable bandgaps, high color purity, and low-cost fabrication. However, challenges persist in outdoor display applications, including poor stability, inadequate weatherability designs, and multicolor integration difficulties. This study proposes a bioinspired “atomic–nano–micro” fabrication strategy based on femtosecond laser direct writing (FsLDW). By synergizing transient laser thermodynamic modulation with surface micro/nanostructural engineering, dual-functional architectures are simultaneously constructed on a polyvinylidene fluoride (PVDF) substrate. The upper layer utilizes laser ablation to generate hierarchical micro/nano structures, forming a lotus-leaf-inspired superhydrophobic surface (contact angle >161°, sliding angle <3°) that provides self-cleaning capability and water-erosion resistance. The lower layer leverages the low thermal conductivity of PVDF to regulate the localized thermal environment, driving directional crystallization of CsPbX3 (X = Cl/Br/I) QDs with in situ halogen composition control, thereby achieving single-step FsLDW-patterned full-spectrum emission (475–690 nm) and high-resolution patterning (∼20 μm). The resulting films retain over 90% of their initial luminescence intensity after simulated outdoor environmental testing and demonstrate exceptional rain-driven self-cleaning properties, effectively resisting pollutant coverage. This strategy offers an innovative solution for developing perovskite-based luminescent devices that integrate high stability, flexibility, full-color display, and weather resistance.
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OPTICAL MATERIALS
·
2026
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IF 4.3
Guiyuan Liu,Wannan Dai,Ziyue Wang,Xiaotian Lu,Ying Ma
Metal halide perovskite (MHP) nanocrystals (NCs) exhibit outstanding optoelectronic properties, making them promising candidates for light-emitting diodes (LEDs). However, their practical application is severely hindered by poor environmental stability. Specifically, violet-emitting CsPbCl 3 NCs suffer from low luminescence properties because of deep-level trap-mediated non-radiative recombination. Here, we report a core-shell structure in which a CsPbCl 3 NC is epitaxially coated with a Cs 2 NaInCl 6 double perovskite shell via a hot-injection method. The resulting CsPbCl 3 @Cs 2 NaInCl 6 heterostructures feature type-I band alignment, enabling effective surface defect passivation and strong charge carrier confinement within the CsPbCl 3 core. As a result, the photoluminescence quantum yield (PLQY) of CsPbCl 3 NCs increases dramatically from 4.4% to 49.5%, accompanied by a prolonged photoluminescence lifetime and a narrower emission spectral full width at half maximum (FWHM). Beyond luminescence enhancement, the Cs 2 NaInCl 6 shell imparts remarkable resistance against damage from water, UV irradiation, and heat. Furthermore, the same encapsulation strategy significantly improves the stability of Mn and Ni-doped CsPbCl 3 (CsPbCl 3 :Mn and CsPbCl 3 :Ni) NCs. This work provides an effective strategy to simultaneously enhance luminescence performance and environmental stability of CsPbCl 3 NCs through passivation with a double perovskite shell.
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JOURNAL OF LIGHTWAVE TECHNOLOGY
·
2026
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IF 5.2
Zhiyong Yin
The simultaneous and specific detection of multiple heavy metal ions in complex environments remains a significant challenge for optical fiber sensors, primarily due to spectral crosstalk and temperature interference. To address this, we present a monolithically-integrated, dual-channel surface plasmon resonance (SPR) fiber sensor capable of crosstalk-compensated and temperature-compensated detection of Cu²⁺ and Ni²⁺. The sensor is fabricated by cascading two sensing regions on a single microstructured optical fiber (MOF), where a strategic combination of heterogeneous metallic films—a silver film for the Cu²⁺ channel and a gold film for the Ni²⁺ channel—creates two spectrally distinct resonance dips in the visible range. To overcome the limitation of specificity, ion-imprinted polymers (polyacrylic acid and chitosan) are functionalized onto the respective channels, creating highly selective recognition sites. Furthermore, an independent temperature-sensing probe, with its resonance strategically located in the near-infrared region, is incorporated into the optical path for real-time temperature monitoring, effectively eliminating thermal cross-sensitivity. Experimental results demonstrate that the sensor exhibits high sensitivity (up to 0.41 nm/μM for Cu²⁺ and 0.34 nm/μM for Ni²⁺ in the low concentration regime), a fast response time (20-30 s), and low detection limits. This work provides a compact and robust all-in-one sensing solution that paves the way for practical, multi-analyte environmental monitoring.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Chen Chang,Shixu Tao,Chang Xu,Yu Zhang,Wenxin Jiang,Yongge Cao,Chaoyang Ma
Colloidal CsPbX3 (X = Cl, Br, I) quantum dots (PQDs) typically suffer from severe degradation under heat, moisture, and UV/blue light irradiation, primarily due to the dynamic detachment and mismatch of surface ligands. Recently, ligand-free template-assisted strategies have emerged as an effective approach to address these challenges by regulating PQD growth through spatial confinement within nanoporous matrices. However, most reported systems are restricted to powder or thin-film forms and lack a robust, transparent, and device-compatible macroscopic architecture. In this work, we for the first time report a ligand-free in situ confined growth strategy for PQDs within a transparent nanoporous poly(methylsilsesquioxane) (PMSQ) xerogel monolith. The nanopores of the hydrophobic PMSQ template provide effective spatial confinement for the PQDs, which suppresses aggregation of PQDs and reduces nonradiative trap states, thereby enabling a high photoluminescence quantum yield exceeding 92% and excellent thermal stability, moisture stability, and photostability. Furthermore, the strategy is extended to synthesize CsPbX3 (X = Cl, Br, I) QDs@PXMs with tunable emission across the visible spectral range from 417.6 to 674.2 nm. A white light-emitting diode fabricated using CsPbBr3 QDs@PXMs and commercial K2SiF6: Mn4+ phosphors achieves a luminous efficiency of 110 lm W–1 and a wide color gamut reaching 133% of the NTSC 1931 standard. These findings demonstrate that CsPbX3 QDs@PXMs constitute robust and high-performance PQD-based composite materials suitable for high-quality lighting and wide-color-gamut display applications.
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ACS Photonics
·
2026
·
IF 6
Xiuting Wu,Tianjun Hu,Qingsong Shan,Hong Zhong,Yuqin Su,Linxiang Yang,Beichen Yuan,Junhui Dai,Yuhao Zhang,Qiangyu Dai,Xiaoming Li,Haibo Zeng
Deep-blue perovskite quantum dot (QD) emitters with narrow emission line widths are critical for next-generation wide-color-gamut QD displays. However, achieving narrow primary deep-blue emission perovskite QDs compliant with Rec. 2100 remains challenging. This difficulty mainly arises from the intrinsic phase segregation of mixed-halide perovskite QDs, the presence of defects, and the inhomogeneous distribution of halide ions among the particles. Herein, we develop a ligand-mediated strategy for the phase separation inhibition and surface reconstruction of CsPb(BrxCl1–x)3 QDs. Specifically, we implement a sequential ligand treatment protocol comprising ion exchange with methyltrioctylammonium chloride, surface cleaning using octylphosphonic acid, and defect passivation via CF3–PEABr. This approach effectively promotes a distinct intergrain isolation and facilitates the homogenized halide distribution throughout the QDs ensemble. The resulting deep-blue quantum dot light-emitting diode (QLED) exhibits stable electroluminescence emission with an ultranarrow full width at half-maximum (fwhm) of 13.4 nm. This achievement marks the narrowest fwhm record of primary deep-blue perovskite QLEDs to date, featuring a 99.1% gamut coverage of Rec. 2100 standard. This work proposes a feasible strategy for ultrahigh color purity deep-blue QLEDs tailored for Rec. 2100 wide-color-gamut displays.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Zeyi Wang,Linqi Chen,Jingzhou Li,Xuting Chen,Xinjie Li,Beier Zhou,Hongxing Dong,Long Zhang
Lead sulfide quantum dots (PbS QDs) offer significant potential for near-infrared (NIR) free-space optical communication (FSOC) due to tunable bandgaps and broad spectral response. However, their microsecond-scale photoluminescence (PL) lifetimes and pronounced Auger recombination critically limit modulation bandwidth and signal-to-noise ratios. Plasmonic nanostructures can address these limitations via the Purcell effect, but the involved lithographic fabrication compromises scalability and precise sub-wavelength structuring. This work presents a facile, lithography-free methodology for dense, vertically aligned gold nanorod (Au NR) arrays with strong localized surface plasmon resonance (LSPR) across the NIR. By combining seed-mediated synthesis of high-aspect-ratio Au NRs (>8) with precise solvent evaporation-induced self-assembly (EISA) on functionalized substrates, vertically oriented arrays are achieved. The integration of vertical and well-aligned Au NR arrays with PbS QD photoconversion layer induces a 769% peak PL intensity enhancement at resonance. Moreover, the Purcell effect from strong near-field confinement accelerates spontaneous emission, reducing the ensemble-average PL lifetime from 860 ns to 279 ns – a critical advance for bandwidth. Within a representative FSOC link employing intensity modulation, the optimized plasmon-enhanced PbS QD photoconversion material achieves a −3 dB bandwidth of 930 kHz and supports 2.0 Mbps on–off keying (OOK) with a bit error rate (BER) of 3.8 × 10⁻ 3 under ambient conditions. This demonstrates a promising improvement over baseline QD devices and validates the efficacy of the EISA-fabricated plasmonic array for high-speed NIR FSOC.
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