DYES AND PIGMENTS
·
2025
·
IF 4.2
Chengda Wu,Yahong Jin
Broadband near-infrared (NIR) phosphor-converted light sources (pc-LSs) are indispensable for emerging technologies that exploit the 700–1100 nm biological transparency window, yet their performance is critically limited by the scarcity of phosphors that simultaneously deliver red-shifted emission, high quantum efficiency, and thermal robustness. Here, we report a Cr 3+ -activated garnet Ca 2 GdZrSnGa 3 O 12 engineered by Ca–Zr/Sn cooperative substitution and M 5+ charge compensation. The incorporation of Cr 3+ into host lattice with a weak-field octahedral environment produces broadband NIR emission ( 4 T 2 → 4 A 2 ) centered at 801 nm with bandwidth of 168 nm under 466 nm excitation. M 5+ cations codoping suppresses non-radiative pathways, elevating IQE to 51.58 % and retaining 81.58 % of the room-temperature intensity at 423 K. A low Huang-Rhys factor ( S = 0.94) and enlarged activation energy ( E a = 0.25 eV) corroborate the suppressed electron–phonon coupling. Prototype phosphor-converted laser diode (pc-LD) and light-emitting diode (pc-LED) packages deliver optical output powers up to 381.2 mW@1500 mW mm −2 and 51.2 mW@300 mA with photoelectric conversion efficiencies approaching 25.4 % and 4.48 %, respectively. These findings provide a materials-by-design route that reconciles the long-standing trade-off between spectral red-shift, quantum efficiency, and thermal robustness in Cr 3+ -activated NIR systems, and constitute a decisive advance toward compact, high-power NIR light engines for next-generation photonic applications.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ting Zhang,Yujia Wang,Yiwen Kuang,Ruilin Yang,Jun Ma,Shilin Zhao,Yang Liao,Hui Mao
A novel biosorbent was facilely prepared by immobilizing bayberry tannin (BT, a typical natural polyphenols) onto chitosan microfiber (CM). The as-prepared CM-BT adsorbent featured to a well-defined microfibrous morphology and highly distributed adsorption sites, which was highly efficient and selective for the adsorptive removal of Cr 3+ from aqueous solutions. Based on batch experiments, the adsorption of Cr 3+ on CM-BT was pH-dependent, and the optimized adsorption pH was determined to be 5.5. The adsorption capacity of CM-BT to Cr 3+ was high up to 20.90 mg/g. The co-existing cations, such as Mg 2+ , Ca 2+ , Fe 3+ and Cu 2+ , exhibited no significant influences on the adsorption of Cr 3+ on CM-BT. The adsorption kinetics were well fitted by the pseudo-second-order rate model ( R 2 > 0.99) while the adsorption isotherms were well described by the Langmuir model ( R 2 > 0.98). Importantly, CM-BT was effective for the continues treatment of low concentration Cr 3+ (2.0 mg/L) contaminated wastewater. Before reached the breakthrough point (5% of the initial Cr 3+ concentration, 0.1 mg/L), the treated volume was as high as 894 bed volume, manifesting the great potential of CM-BT in practical treatment of Cr 3+ contaminated wastewater.
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PROGRESS IN SOLID STATE CHEMISTRY
·
2026
·
IF 9.7
Chao Wei,Jingyu Ran,Jie Zhang
The wideband near-infrared (NIR) phosphors for next-generation intelligent NIR light sources are becoming a research hotspot in the field of luminescent materials due to their potential applications in optical sensing, biological imaging, and smart lighting. This study reports a Cr 3+ -activated A 3 B(PO 4 ) 3 -type (Sr 3 Lu(PO 4 ) 3 ), abbreviated as SLP) near-infrared phosphor. Under 466 nm blue light excitation, SLP:Cr 3+ phosphor exhibits a broad near-infrared emission from 700 to 1200 nm with a peak wavelength at 860 nm, a full width at half maximum (FWHM) of 141 nm, and an initial quantum yield of 31.48%. Structural and spectroscopic characterization confirms that Cr 3+ preferentially occupies the octahedral coordination sites of Lu 3+ in the matrix, forming a weak crystal field environment that favors the spin-allowed 4 T 2 → 4 A 2 transition of Cr 3+ , leading to broad near-infrared emission. Additionally, by substituting Y 3+ for the B-site (Lu 3+ site), the luminescent intensity of the material is significantly enhanced, and the quantum yield is increased to 81.53%. Furthermore, the introduction of Yb 3+ constructs a Cr 3+ →Yb 3+ energy transfer system, further optimizing the luminescent performance. Although the phosphor exhibits severe thermal quenching, the packaged near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) maintain a low surface temperature of 59.5 °C at 500 mA, ensuring reliable operation. The phosphor also exhibits excellent temperature sensitivity (max relative sensitivity: 3.33%·K −1 ) for fluorescence thermometry. Practical applications including invisible QR code encryption, night vision, biological imaging, and long-distance illumination are demonstrated, showcasing the versatility of the developed NIR pc-LED. This work provides a high-performance NIR phosphor candidate for multi-functional smart light sources.
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Advanced Optical Materials
·
2026
·Vol. 14
·期 17
·e71226
·
IF 7.2
Jinwei Liu,Jiaxin Li,Guojun Zheng,Chuan Liao,Jianhong Wu,Jianrong Qiu,Wenge Xiao
Cr 3+ emission can well cover the NIR-I region (700–950 nm), while Ni 2+ emission typically extends across the NIR-II region (1000–1700 nm), making the Cr 3+ –Ni 2+ co-doped phosphors among the most promising ultrabroadband NIR emitters for phosphor-converted light-emitting diodes (pc-LEDs). However, a pronounced gap or even spectral discontinuity between the two emission bands results in a severely imbalanced photon flux across the spectrum, thereby degrading multicomponent spectral detection accuracy and significantly limiting the practical applications of such NIR pc-LED devices. Here, we report a superstoichiometric spinel MgO· n Ga 2 O 3 :Cr 3+ ,Ni 2+ ( n > 1) phosphor, in which the excess Ga 2 O 3 increases the degree of cation inversion to achieve a long-wavelength Cr 3+ emission at 895 nm, substantially elevating the spectral gap height to a state-of-the-art value of ≈36%. Moreover, efficient energy transfer from Cr 3+ to Ni 2+ enables the optimized MgO·1.2Ga 2 O 3 :Cr 3+ ,Ni 2+ phosphor to demonstrate a high internal quantum efficiency of 97% and excellent thermal stability. Finally, the as-fabricated NIR pc-LED delivers an exceptional photoelectric efficiency of 21% at 20 mA and a maximum NIR output power of 62 mW at 350 mA. This work establishes a new pathway toward next-generation compact ultrabroadband NIR pc-LEDs featuring unprecedented spectral flatness and superior optoelectronic performance.
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TALANTA
·
2026
·
IF 6.7
Hailong Yu,Qiuyun Wang,Jingquan Lin,Wanjun Liu,Yubo Liu,Xun Gao
Water quality is increasingly threatened by metal contamination, posing serious risks to ecosystems and human health. Laser-induced breakdown spectroscopy (LIBS) offers rapid, multi-element detection for monitoring contaminated water, but its sensitivity and stability are limited by matrix effects and inefficient energy coupling, making ppb-level detection challenging. In this study, a microstructured electrode coupled with electrochemical deposition enrichment for LIBS detection (ME-ED-LIBS) was developed, prepared by nanosecond laser etching on copper. Under applied electric fields, Pb 2+ and Cr 3+ ions were directionally deposited on the microstructured electrodes. Quantitative analysis showed that, compared with planar electrodes, microstructured electrodes increased the Cr I 425.43 nm and Pb I 405.78 nm line intensities by 1.5–5 times while reducing the relative standard deviation from 12% to below 5%. Limits of detection decreased from 10.59 to 1.34 ng/mL for Cr and from 215.75 to 26.11 ng/mL for Pb, improving sensitivity approximately 8 times, with average relative errors dropping to 1.23% and 1.18%, far below the 7.04% and 18.10% for planar electrodes. Electrochemical deposition simulations using a tertiary current distribution phase-field model revealed a closed-loop coupling mechanism: field enhancement drives directed deposition, induces morphology reconstruction, and further amplifies the field, optimizing enrichment pathways and interfacial selectivity. This approach enables precise ng/mL (ppb-level) quantification of metal contaminants, providing a sensitive, reliable technique for water quality monitoring.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jinrui Hou,Shiji Liu,Xinyue Wu,Shujuan Zhuo,Jinyan Du
Wound healing in skin infections is frequently compromised by multi-drug-resistant bacterial colonization, persistent inflammation, and bacterial biofilm formation. To address these issues, we engineered an innovative multifunctional biomaterial (Cur@MIL-101(Cr/Ag)) which integrates potent antibacterial, anti-biofilm, and tissue-regenerative properties. This composite was constructed via a bimetallic synergistic and molecularly confined strategy, where Ag + and Cr 3+ were co-anchored within a terephthalic acid-based framework (MIL-101) through hydrothermal method, followed by the in situ encapsulation of curcumin. In vitro evaluations revealed potent broad-spectrum antibacterial activity against both Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ), along with significant inhibition of biofilm formation and minimum inhibitory concentrations (MICs) of 8 ppm and 2 ppm, respectively. In vivo, topical application of Cur@MIL-101(Cr/Ag) in a wound-infected mouse model further demonstrated complete bacterial eradication, mitigated inflammatory responses, accelerated wound closure, and promoted tissue regeneration with no observable systemic toxicity within the scope of assessment (i.e., stable body weight and non-pathological organ morphology). The therapeutic efficacy can be attributed to a synergistic triple-therapy mechanism comprising: (i) electrostatic interaction, (ii) ROS-mediated oxidative stress induction, (iii) synergistic interaction of multiple antimicrobial components (Ag⁺, Cr³⁺, and curcumin). This nanoengineered platform presents a clinically translatable strategy for precision therapy of infected wounds, combining antimicrobial robustness, biofilm penetration, and pro-regenerative functions within an integrated therapeutic system.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Hui Xie,Hui Fu,Zhentao Du,Linjie Tong,Jinliang Jiang,Xue Jiang,Jialong Zhao,Weiyou Yang,Jinju Zheng
The increasing need for simultaneous detection of multiple components and precise analysis has driven the search for high-performance, broadband-emitting near-infrared (NIR) materials. Herein, the Cr3+-doped Cs2NaInCl6 (CNIC) lead-free double perovskites (DPs) are fabricated by a hydrothermal approach. The as-synthesized DPs exhibit a remarkable photoluminescence quantum yield (PLQY) of 92.41%, with a broad emission spectrum centered at 960 nm and a full width at half maximum (FWHM) of 160 nm. This exceptional performance is attributed to the Cr3+ ions with the spin-allowed 4T2 → 4A2 transition in a weak crystal field. The CNIC: Cr3+ DPs demonstrate not only excellent air and thermal stability but also impressive photostability. Furthermore, Cr3+/Ln3+ (Ln3+ = Ho3+, Tm3+, and Er3+) co-doped CNIC DPs are employed to achieve multi-peak emissions from NIR Ⅰ to NIR Ⅱ by facilitating energy transfer from Cr3+ to Ln3+. The optimal PLQYs of the co-doped DPs are found to be 69.34% (Ho3+ emission: 14.67%), 79.94% (Tm3+ emission: 31.95%), and 71.07% (Er3+ emission: 25.88%), respectively. These co-doped DPs have been successfully incorporated into high-performance NIR phosphor-converted light-emitting diodes (NIR pc-LEDs), with promising applications in synchronous multi-substance analysis, biological detection, and food safety monitoring, highlighting their potential for multifunctional applications.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2020
·
IF 4.706
Hao Tang,Ying Xu,Xianhua Cheng
To investigate the optical properties of rare earth upconversion particle, the Cr 3+ and alkaline-earth ions (Mg 2+ or Ca 2+ ) co-doped β-NaYF 4 :Yb 3+ /Er 3+ upconversion microparticles (UCMPs) were synthesized via a facile hydrothermal method . The influences of co-doping ions and their concentrations on crystal structure, particle morphology and optical properties were thoroughly investigated by XRD , SEM , FT-IR spectra, UV–VIS-NIR absorption spectra and photoluminescence spectra. And the effects of the two kinds of impurity ions co-doping on the UC particle growth were studied. We found that luminescence quenching could be inhibited by using Cr 3+ and Mg 2+ co-doping due to the asymmetrical ion arrangement around activator. However, the Cr 3+ and Ca 2+ co-doping was found to quench the upconversion luminescence (UCL), and the possible mechanism was suggested. These discoveries lead to new insights into the quenching effect and new strategy to design UCMPs for better luminescence performance.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Fengmei Zhu,Yuan Gao,Chunli Zhao,Jiacheng Pi,Jianbei Qiu
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) offer numerous advantages, including compact size, tunable emission spectra, energy efficiency, and high integration potential. These features make them highly promising for various applications, such as night vision monitoring, food safety inspection, biomedical imaging, and theragnostics. All-inorganic halide double-perovskite materials, known for their large absorption cross section, excellent defect tolerance, and long carrier diffusion radius, serve as unique matrices for constructing near-infrared fluorescent materials. In this study, we successfully prepared the all-inorganic metal halide double-perovskite Cs2NaYCl6:Cr3+ using a grinding–sintering method. A small fraction of the [YCl6] octahedra within the host material’s lattice was substituted with Cr3+ ions, resulting in the creation of the Cs2NaYCl6:Cr3+ phosphor. When excited with λ = 310 nm UV light, the phosphor exhibited a broad emission range spanning from 800 to 1400 nm, covering the NIR-I and NIR-II regions. It had a broad bandwidth emission of 185 nm and achieved a fluorescence quantum yield of 20.2%. The unique broadband emission of the phosphor originates from the weak crystal field environment provided by the Cs2NaYCl6 host matrix, which enhances the luminescence properties of the Cr3+ ions. To create NIR pc-LEDs, the phosphor was encapsulated onto a commercially available UV LED chip operating at 310 nm. The potential application of these NIR pc-LEDs in night vision imaging was successfully validated.
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PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2013
·
IF 4.75
Hu Li,Qiuyun Zhang,Xiaofang Liu,Fei Chang,Yuping Zhang,Wei Xue,Song Yang
A series of functional polymeric ionic liquids (FPILs) were prepared by coupling of SO 3 H-functionalized polymeric ionic liquids with different counterpart anions containing or excluding CrCl 3 ·6H 2 O, and characterized by SEM, FT-IR, XRD, NH 3 -TPD, TG, melting point, ICP-AES, and TEM. The catalytic activity of the prepared solid FPILs was investigated for the conversion of biomass including fructose, glucose and cellulose into 5-hydroxymethylfurfural (HMF) with the presence of DMSO-mediated solvents, successively producing moderate to excellent yields of HMF under atmospheric pressure. The FPILs catalysts developed in this study present improved performance on fructose-to-HMF conversion over other solid catalysts, such as functional ionic liquids supported by silica, metal oxides and strong acid ion exchange resin catalysts, and can be very easily recycled at least five times without significant loss of activity. In addition, a kinetic analysis was carried out to illustrate the formation of HMF.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Fanjia Sun,Yanhui Wang,Hongwei Gao,Xueqing Tian,Rui Zhu,Youbin Zheng,Jianbing Zang,Liang Dong
To address the challenges of the chlorine evolution reaction (CER) and catalyst corrosion in seawater electrolysis, this study developed a chromium-doped nickel-iron layered double hydroxide catalyst. This catalyst operates continuously for 100 h in alkaline seawater, showing consistent increases in activity. Chromium (Cr) doping strengthens the metal-oxygen (M-O) bond, inhibits the loss of lattice oxygen, and facilitates a shift toward the adsorbate evolution mechanism in the reaction pathway. Additionally, CrO 4 2- , produced by the in-situ oxidation and dissolution of Cr 3+ , establishes a dynamic “oxidation-dissolution-adsorption” equilibrium at the interface. This significantly reduces chloride ion (Cl - ) adsorption, corrosion, and the energy barriers of reactions. The introduction of a methanol-assisted system further decreases the overpotential. An electrolyzer that incorporates this system with Pt/C achieves efficient hydrogen production at a current density of 100 mA cm −2 and a voltage of 1.45 V.
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Advanced Optical Materials
·
2024
·Vol. 13
·期 1
·2401957
·
IF 8
Xin Xie,Wanyin Ge,Qian Zhang,Ye Tian,Zili Luo,Shifan Shang,Jianke Liu,Wenbin Cao
Cr 3+ -doped near-infrared (NIR) phosphors have attracted significant attention in recent years. Despite this, achieving high-performance NIR phosphors with broadband emission and excellent thermal stability remains a considerable challenge. This study presents Lu 3 Ga 5 O 12 :Cr 3+ , which demonstrates a tunable emission peak ranging from 705 to 759 nm and an increased full-width at half-peak maximum (FWHM) from 46 to 139 nm by substituting the [Mg 2+ -Ge 4+ ] chemical unit for the [Ga 3+ -Ga 3+ ] unit. Additionally, in Lu 3 MgGa 3 GeO 12 :Cr 3+ , Yb 3+ , an energy transfer channel (Cr 3+ -Yb 3+ ) is constructed. Under blue light excitation, the characteristic emission peaks of Cr 3+ (600–900 nm) and Yb 3+ (900–1100 nm) are observed simultaneously. However, the emission band between 850 and 900 nm is relatively weak, resulting in a discontinuous emission spectrum. To address this, Lu 3 MgGa 3 GeO 12 :Cr 3+ , Yb 3+ , Nd 3+ phosphors are proposed, which exhibit a continuous broadband NIR emission with a FWHM of 253 nm and internal quantum efficiency of 47.3%. The luminescence intensity retains 81% of its room temperature value even at 423 K. Combining this new phosphor with a blue LED chip results in a portable NIR light source with potential applications in non-destructive detection, information encryption, bio-imaging, and NIR remote control. This work offers a novel perspective for developing high-performance NIR phosphors.
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