JOURNAL OF SUPERCRITICAL FLUIDS
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2022
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IF 4.514
Jianqiao Yang,Jiyuan Sun,Shuyuan Bai,Hao Wu,Shuzhong Wang,Yanhui Li,Wenhao Ma,Donghai Xu
To improve the corrosion resistance of component materials in supercritical water oxidation (SCWO) environment, a 15 µm Cr coating was prepared on Alloy 625 by magnetron sputtering, and the effect of oxygen concentration (0 M, 0.16 M, and 0.94 M) on the stability of the Cr coating in an SCW environment was investigated. Results show that the stability of the Cr 2 O 3 layer strongly depends on the oxygen concentration in the exposure environment. The protective Cr 2 O 3 layer was transformed to soluble Cr(VI) species and dissolved in SCW containing 0.94 M oxygen. Except for Cr 2 O 3 , some Fe/Ni containing oxides were also detected. The stability of the Cr coating in SCW with different concentrations of oxygen is discussed.
研究领域:
材料科学
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腐蚀与防护
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表面工程
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能源环境工程
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高温化学
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2025
·Vol. 27
·期 45
·24273-24283
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IF 2.9
Jin Zou,Daoyun Zhu,Zhongfei Mu,Song Xu,Nurahmat Wali,Fugen Wu,Huafeng Dong,Xin Zhang,Xiao Wu,Yifei Luo,Yuchun Zhan
Near-infrared (NIR) spectroscopic technology has shown extensive application prospects. However, developing NIR phosphors with tunability and high thermal stability is a huge challenge. In this work, a highly promising phosphate compound, K3Ga2(PO4)3, has been successfully synthesized. When doped with Cr3+ ions, it is particularly noteworthy that Cr3+ exhibits highly efficient and thermally stable broadband NIR luminescence in the tetrahedral coordination environment. This unique property makes K3Ga2(PO4)3:Cr3+ a compelling candidate for advanced photonic applications. Therefore, studying the luminescent properties of Cr3+ rare earth ions doped into tetrahedral sites is of great significance. In the tetrahedral coordination environment of K3Ga2(PO4)3:Cr3+ ions exhibit broadband near-infrared emission spanning from 700 to 1100 nm (λem = 822 nm, FWHM = 124 nm) under 452 nm blue light excitation. Remarkably, the quantum efficiency reaches as high as 70.9%, demonstrating its exceptional potential for advanced photonic applications. In addition, the phosphors demonstrated exceptional thermal stability with near-zero thermal quenching. The NIR luminescence intensity at 373 K and 423 K retained 109.0% and 90.4% of its initial room-temperature value, respectively. This remarkable performance can be attributed to the material's ultra-wide band gap, and minimal electron–phonon coupling. The NIR pc-LED devices, fabricated by integrating the optimized K3Ga1.93(PO4)3:0.07Cr3+ phosphors with a blue LED chip (λex = 455 nm), achieved a near-infrared output power of 274 mW with a conversion efficiency of 5.42% under a driving current of 100 mA. Experimental results demonstrate that the fabricated NIR pc-LED exhibits significant potential for applications in night vision and vein imaging technologies. This study provides a strategic framework for designing high-performance NIR pc-LED devices, utilizing K3Ga2(PO4)3:Cr3+ as an efficient phosphor-converted light source, and offers valuable insights for practical implementation in advanced optical systems.
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JOURNAL OF LUMINESCENCE
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2025
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IF 3.6
Di Qian,Yahong Jin,Haoyi Wu,Yihua Hu
Advances in broadband near-infrared (NIR) emitting materials represent a pivotal frontier for next-generation intelligent NIR phosphor-converted light-emitting diode (pc-LED) technologies. However, practical implementation of these materials has been constrained by challenges such as suboptimal quantum efficiency (QE) and pronounced thermal quenching (TQ). In this study, we report the synthesis and comprehensive characterization of broadband NIR-emitting phosphors, Gd 3 AlGa 4 O 12 :Cr 3+ , exhibiting anti-TQ properties without compromising QE. The material's inherent structural rigidity , wide bandgap, and the minimal electron-phonon coupling (EPC) effect provide a foundation for high-performance broadband NIR luminescence. Strategic optimization of Cr 3+ doping concentrations, combined with controlled excited-state electron migration, achieves an internal quantum efficiency (IQE) of 98.23 % and a remarkable anti-TQ capability (135.1 %@483 K). The practical potential is further demonstrated through prototype NIR pc-LED implementation, where integration with a commercial blue LED chip delivers an NIR output power of 285.38 mW at 1170 mA and a wall-plug efficiency (WPE) of 17.42 % at 30 mA, highlighting its potential for use in diverse applications such as plant growth, component analysis, night vision, nondestructive detection, and non-invasive imaging. Overall, this work addresses critical challenges in broadband NIR phosphors and advances the development of high-performance and energy-efficient miniatured broadband NIR light sources .
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Haojin Liu,Yanzhang Li,Xiaohui Duan,Xiaoxue Guo,Pengfei Zhang,Ziyi Guo,Bitao Liu,Wenbo Chen,Yanyan Li,Chaochao Xi,Lei Zhao
Luminescent materials enable effective transduction of external stimuli via changes in intensity, lifetime, or emission spectrum. However, conventional single-parameter detection suffer from limited reliability under environmental fluctuations. To address this, ratiometric luminescent sensing with intrinsic self-referencing mechanisms have been developed to enhance robustness. In this work, a multifunctional luminescent platform was established by embedding Mn 2+ /Cr 3+ co -doped SrGa 12 O 19 (SGO) phosphors into a polydimethylsiloxane (PDMS) matrix (SGO: Cr 3+ ,Mn 2+ @PDMS). This composite exhibits triboelectricity-induced mechanoluminescence (ML) under mechanical stimuli, with emission intensity correlating with applied strain. Distinct mechanical sensitivities of Mn 2+ and Cr 3+ enable a ratiometric ML response in the 25%–50% deformation range, achieving self-referenced mechanical sensing. Under X-ray irradiation, a trap-assisted ratiometric radioluminescence (RL) phenomenon emerges, governed by the dynamic interplay between charge traps and luminescent centers. Comparative studies with ultraviolet (UV)-excited luminescence confirm a unified mechanism wherein trapped carriers are gradually populated and subsequently redistributed among multiple emission centers, producing a tunable and dynamic luminescence profile. Together, these findings demonstrate the feasibility of integrating ratiometric detection for both mechanical and radiation stimuli within a single material system. This work offers a novel approach toward the development of next-generation multifunctional optical sensors for deployment in complex or variable environments.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2026
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IF 5.9
Yichen Yang,Xiaojiao Kang,Qiwen Pan,Zhennan Zhu,Wei Lü
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are gaining significant interest due to their potential in spectroscopic applications. NIR phosphors play a critical role in pc-LED devices by converting visible light into NIR emission with high stability and tunability. In this study, an efficient broadband NIR phosphor, Ca 3 TiTaGa 3 O 12 :Cr 3+ , is developed and systematically investigated. Ca 3 TiTaGa 3 O 12 :Cr 3+ exhibits a broad NIR emission band centered at 790 nm with a full width at half maximum (FWHM) of 202 nm upon 450 nm blue light excitation. The emission bandwidth is further expanded to 303 nm by introducing an optimal amount of Yb 3+ co-doping, which produces a merged ultra-broadband Cr 3+ –Yb 3+ emission. Luminescence and decay kinetic analysis reveal that the resultant ultra-broadband emission originates from effective energy transfer Cr 3+ to Yb 3+ . Moreover, the Yb 3+ co-doping enhances the internal quantum efficiency from 30.5% to 41.3%, and improves thermal stability with emission retention increasing from 42.6% to 57.4% at 150 °C. The Ca 3 TiTaGa 3 O 12 :Cr 3+ and Ca 3 TiTaGa 3 O 12 :Cr 3+ , Yb 3+ phosphors are successfully integrated with a 450 nm blue LED chip, demonstrating their potential for practical NIR pc-LED device applications in night vision and bioimaging.
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Laser & Photonics Reviews
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2026
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IF 10
Mingkai Wei,Yanjun Hao,Xuejie Zhang,Wei Li,Haoran Zhang,Bingfu Lei
Near-infrared (NIR) phosphor-converted LEDs (pc-LEDs) are critical for smart agriculture and night vision, but their efficiency is limited by low external quantum efficiency (EQE) of phosphors. Herein, the introduction of Al 3+ ions via chemical substitution increased the EQE of the GdGa 2.85 (BO 3 ) 4 :0.15Cr 3+ NIR phosphor from 8.3% to 30.7% (a relative increase of 270%). Importantly, an “absorption-efficiency decoupling” paradigm is identified: while the Al 3+ substitution reduces the absorbance, confirmed by Density Functional Theory, diffuse reflectance spectra, and X-ray photoelectron spectroscopy, the quantum efficiency is significantly increased. Theoretical analyses and spectroscopic evidence suggest that the superior EQE gain stems from Al 3+ -induced crystal field enhancement and subsequent energy level remodeling. This remodeling optimizes the Cr 3+ excited state dynamics by suppressing the non-radiative transitions pathway and increasing the radiative transitions, thus overcoming the detrimental effects of absorption reduction. The optimized phosphor, combined with a blue LED chip, produced an NIR pc-LED achieving 41.7 mW output power and 15.7% photoelectric efficiency at 100 mA. The device successfully demonstrated potential for precision agriculture and night vision. This work provides novel insight into “absorption-efficiency decoupling” and offers a new design strategy for efficient Cr 3+ -doped NIR phosphors.
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ADVANCED MATERIALS
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2026
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IF 26.8
Yiyu Cai,Jianqing Chang,Jian Zhang,Jianjun Liu,Shanshan Wang,Mingmei Wu,Jun-Cheng Zhang
Near-infrared (NIR) mechanoluminescence (ML) offers a self-powered and non-invasive route for stress visualization and biomechanical imaging, yet most NIR ML materials remain constrained by narrow emission bandwidths and reliance on dark-field conditions. Here, we report two complementary MgO-based ML systems spanning the NIR-I and NIR-II windows, establishing MgO as a robust platform for broadband mechanoresponsive emission. MgO:Cr 3+ delivers tunable NIR-I ML (700–1000 nm; full width at half maximum, FWHM, 94–188 nm) under diverse mechanical stimuli, including friction, impact, tension, compression, bending, and twisting, while MgO:Ni 2+ produces ultrabroadband NIR-II ML (1000–1700 nm; FWHM 225 nm) readily detectable under ambient lighting. Mechanistic studies reveal that ML arises from the synergistic interplay of local piezoelectric polarization, dislocation-mediated charge separation, and triboelectric effects at organic–inorganic interfaces, whereas the observed spectral variations stem from crystal-field modulation and lattice distortions. Co-doping of Cr 3+ and Ni 2+ further differentiates optical and mechanical excitation pathways—optical excitation induces Cr 3+ -sensitized Ni 2+ emission, whereas mechanical excitation directly activates their low-lying levels. These insights unify mechano-to-photon conversion in centrosymmetric oxides and provide design principles for broadband, durable, and environmentally adaptive ML materials, advancing applications in multimodal sensing, structural health monitoring, and noninvasive biomechanical imaging.
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Materials Today
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2026
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IF 24.1
Yunfeng Fang,Yuanyuan Dou,Yuhe Shao,Mingyue Chen,Fenglong Sun,Zhen Song,Quanlin Liu
The development of near-infrared (NIR) mechanoluminescent materials that operate autonomously without external excitation is crucial for deep-tissue biomechanical sensing but remains challenging due to the scarcity of efficient, long-wavelength emitting systems. Herein, we report a highly efficient, self-recoverable NIR-I mechanoluminescent material based on Cr 3+ -doped MgNb 2 O 6 . Through strategic Li + co-doping for charge compensation, we achieved a 2.75-fold enhancement in mechanoluminescent intensity. The optimized phosphor exhibits broadband emission centered at 880 nm, representing one of the longest wavelengths reported for Cr 3+ -activated mechanoluminescent systems. This deep-penetrating NIR-I emission enables detectable mechano-optical signaling through up to 10 mm of biological tissue. Leveraging this capability, we design a proof-of-concept application as a smart, mechano-responsive liner for in situ monitoring of implant kinematics and positioning accuracy in total knee arthroplasty. This work not only introduces a high-performance NIR-I mechanoluminescent material but also opens new avenues for real-time, non-invasive surveillance of bio-implants and deep-tissue biomechanics.
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JOURNAL OF POWER SOURCES
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2026
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IF 7.9
Jingyi Hao,Jiale Wang,Weihua Zhang,Xuelei Li,Zhihui Xu,Huirong Liu,Hexige Wuliji,Aruuhan Bayaguud
High-entropy oxides (HEOs) have attracted significant attention as potential anode materials for lithium-ion batteries (LIBs) owing to their exceptional theoretical capacity. In this work, a cobalt-free high-entropy oxide (HEO) anode material is prepared through a solid-state method and doped with lithium ions. Moreover, the stability mechanism and electronic properties of the material are characterized using experiments and density functional theory (DFT) calculations. The prepared HEOs [Li x (Cr 0.2 Fe 0.2 Ni 0.2 Mn 0.2 Cu 0.2 ) 1-x ] 3 O 4 (x = 0, 0.05, 0.1, 0.2) are all have a single-phase spinel structure. The undoped (Cr 0.2 Fe 0.2 Ni 0.2 Mn 0.2 Cu 0.2 ) 3 O 4 (HEO-0) maintains a specific capacity of 632.3 mAh g −1 following 250 cycles at 0.1 A g −1 . This performance can be further enhanced through lithium doping. In particular, the HEO-10 (x = 0.1) achieves a specific capacity of 765.0 mAh g −1 after 250 cycles at 0.1 A g −1 , while preserving 181.4 mAh g −1 following 1500 cycles at 1 A g −1 . This performance enhancement originates primarily from lithium-induced oxygen vacancies, which generate additional active sites for lithium storage and accelerate ion transport kinetics.
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ADVANCED MATERIALS
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2026
·
IF 26.8
Ke Su,Maja Szymczak,Lefu Mei,Xin Pan,Marcin Runowski,Przemysław Woźny,Qingfeng Guo,Bin Ma,Libing Liao,Zhijian Peng,Lukasz Marciniak
Optical manometry provides noncontact pressure sensing but remains vulnerable to temperature-induced drift, where thermal expansion and nonradiative relaxation distort luminescence spectra and kinetics. We develop a spectro-temporal ratiometric approach that combines spectral and time-gated luminescence channels to decouple pressure and temperature responses and realize thermally invariant optical manometry. Using Y 3 In 2 Ga 3 O 12 :Cr 3+ as a rigid-lattice host (D q/B ≈ 2.2), lattice stiffness minimizes thermal sensitivity S R,T , while ratiometric detection stabilizes pressure sensitivity S R,p . The resulting thermal-invariance manometric factor ( TIMF) = S R,p / S R,T reaches ≈7700 K·GPa −1 in the spectral domain and ≈2500 K·GPa −1 in the time-gated domain, with S R,p up to 51%·GPa −1 . These values exceed ruby benchmarks by two orders of magnitude and surpass conventional lifetime analysis by ∼40 times, enabling accurate, self-referenced optical pressure mapping under extreme thermo-mechanical conditions. This work provides luminescent manometry from empirical calibration to a quantitative framework for thermally reliable sensing in coupled fields.
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Laser & Photonics Reviews
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2026
·
IF 10
Xujiang Liu,Yang Xu,Ling Luo,Yuanheng Mu,Mavlanjan Rahman,Pengpeng Dai,Xiaojun Wang
Achieving near-infrared (NIR) phosphors with broadband emission, robust thermal stability, high internal quantum efficiency (IQE), and excellent chemical durability remains a longstanding challenge, largely due to the fundamental trade-off between structural rigidity and flexibility. Here, we overcome this constraint by designing a novel series of garnet-type phosphors, BaY 2 Ga 4- x GeO 12 : x Cr 3+ (BYGG: x Cr 3+ ). The optimized composition BYGG:0.06Cr 3+ delivers an IQE of 93%, remarkable anti-thermal quenching behavior (103% emission retention at 423 K), and outstanding chemical stability (retaining 97% emission after 35 days in water). Notably, fine-tuning the Cr 3+ concentration broadens the emission bandwidth from 77 to 194 nm while preserving strong thermal stability (93%@423 K). This exceptional performance arises from the synergistic combination of ultra-high structural rigidity (Debye temperature, Θ D = 987 K), wide bandgap (5.10 eV), weak crystal field strength, and optimized 4 T 2 excited-state population. A fabricated NIR phosphor-converted LED (pc-LED) device demonstrates an NIR radiated power of 189.35 mW at 100 mA and a photoelectric conversion efficiency up to 12%. These results establish NIR phosphor BYGG: x Cr 3+ as a promising candidate for next-generation NIR pc-LED applications in night vision, non-destructive inspection, and biomedical imaging.
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RARE METALS
·
2026
·
IF 11
Jun-Xiao Wu,Xing-Liang Luo,Pu-Wei Zhai,Ming-Hui Long,Yuan Xue,Xiu-Xia Yang,Xu-Hui Xu
en This link goes to a English section zh This link goes to a Chinese section X-ray delayed imaging technology leverages an “irradiation-storage-thermally stimulated readout” mode, demonstrating unique advantages in intermittent monitoring scenarios such as high-temperature/high-radiation environments. This typically requires materials combining abundant carrier-trapping energy levels with structural thermostability. Herein, Cr 3+ -doped ZnGa 2 O 4 glass ceramics (ZGC GCs) serve as a functional platform, utilizing their deep trap energy levels (main peak 197.7°C) to efficiently capture and store X-ray imaging information, and achieve high-brightness X-ray delayed imaging by modulating the thermally stimulated detrapping rates. Under its exceptional structural thermostability and deep trap characteristics, ZGC GCs maintain high-quality delayed imaging capability by thermal stimulation even after 180°C irradiation, highlighting their potential for high-temperature nondestructive testing and surpassing the high-temperature failure threshold of conventional scintillators. This work pioneers functional applications of glass ceramics in high-temperature irradiation scenarios and offers a novel perspective for selecting harsh-environment-adapted X-ray imaging materials. 摘要 en This link goes to a English section zh This link goes to a Chinese section X射线延迟成像技术通过“辐照-存储-热激励读取”模式, 在间歇性监控场景(如高温/高辐射环境)中展现独特优势, 而热激励读取过程往往需要材料具备优异的结构热稳定性。本文以Cr 3+ 掺杂ZnGa 2 O 4 透明玻璃陶瓷(ZGC GCs)为载体, 利用其深陷阱能级(主峰197.7°C)高效捕获并存储X射线成像信息, 通过调节热激励脱陷速率实现高亮度X射线延迟成像。基于其优异的结构热稳定性及较深的陷阱能级, 在180°C高温环境下辐照后, ZGC GCs仍可通过热激励实现高质量延迟成像, 凸显其在高温无损检测领域的突出潜力, 突破传统闪烁体高温失效瓶颈。我们的工作为透明玻璃陶瓷的高温辐照功能应用开创了新方向, 并为恶劣环境适用型X射线成像材料的选择提供了新视角。
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危险品化学品经营许可证（带存储）