CERAMICS INTERNATIONAL
·
2026
·
IF 6
Qi Chen,Rongyi Kuang,Yinyue Cao,Zezhong Yang,Siran Tao,Binchang Wu,Lin Huang,Bo-Mei Liu,Jing Wang
The second near-infrared window (NIR-II, 1000-1700 nm) phosphor-converted LEDs (pc-LEDs) show great potential for portable spectroscopic detection. However, high-performance long-wavelength (>1350 nm) NIR-II phosphors that combine broadband emission, high thermal stability, and efficient blue-light excitation, are still relatively scarce. Herein, a Lu 3 Ga 5 O 12 :Cr 3+ ,Ni 2+ phosphor was developed via a Cr 3+ sensitization strategy. Cr 3+ and Ni 2+ stably occupy the [GaO 6 ] octahedral sites, enabling efficient energy-transfer from Cr 3+ to Ni 2+ . The optimal sample exhibits broadband NIR-II emission at 1427 nm with an FWHM of 277 nm, an EQE of 23.1%, and excellent thermal stability (I 373K /I 293K = 81.5%). The pc-LED based on this NIR-II phosphor achieves penetration imaging and non-destructive identification of daily necessities. More notably, rapid spectral differentiation of common plastics (PA, PE, PP, PVC and PET) was successfully realized using the NIR-II luminescence of the as-prepared phosphor. This work provides guidance for constructing high-performance NIR-II phosphors and promotes the practical deployment of NIR spectroscopy in resource recycling.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Wenbo Ji,Fengmei Zhu,Yuan Gao,Jianbei Qiu
The performance and service life of a traditional NIR phosphor-converted light-emitting diodes sealed by epoxy resin are affected over time due to the low thermal conductivity of the casting material that leads to excessive heat build-up, an accelerated aging and discoloration of the resin. Here, we report the synthesis and characterization of a highly efficient NIR emitting LiAl 5 O 8 :Cr 3+ nanocrystals embedded in transparent glass-ceramic. Under 415 nm light excitation the emission, the new NIR phosphor exhibits NIR emission in sharp lines covering 650∼1000 nm to originate from the spin-allowed 4 T 2 / 2 E→ 4 A 2 transition of Cr 3+ ions, with an emission peak at ∼ 720 nm and an optimal PLQY of about ∼ 41.28%. The NIR emission originates from the spin-allowed 4 T 2 / 2 E→ 4 A 2 transition of Cr 3+ . The transparent glass-ceramic showed excellent luminescence thermal stability; the integrated luminescence intensity measured at 383 K is ∼ 66.55% of that measured at room temperature (303 K). We constructed a NIR pc-LED light source device by coupling a piece of LiAl 5 O 8 :Cr 3+ nanocrystal-laden glass-ceramic and a purple LED chip and performed characterization of the luminescence properties of this device. The potential application of this device in NIR imaging was demonstrated. Our study provides a basis for further development of thermal stable and highly efficient transparent glass-ceramic based NIR luminescence materials and the exploration for their applications.
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RSC Advances
·
2021
·Vol. 11
·期 54
·33969-33979
·
IF 3.361
Luxin Zhang,Yuting Liu,Ruijun Sun,Simin Yi
5-Ethoxymethylfurfural (EMF) has been identified as a potential biofuel and fuel additive, for which the production from glucose (the most abundant and inexpensive monosaccharide) in a one-step process would be highly desirable. Here, the synthesis of sulfonic acid-functionalized porous coordination polymers (PCPs) and their application as catalysts for EMF synthesis are reported. PCP(Cr)-BA (PCP material with Cr3+ ions and H2BDC-SO3H linkers) and PCP(Cr)-NA (PCP material with Cr3+ ions and H2NDC(SO3H)2 linkers) materials containing both Cr3+ sites and Brønsted-acidic –SO3H sites were prepared. The morphology, pore structure, acidity, chemical composition, and thermal stability of the two functionalized PCP(Cr) catalysts were analyzed by systematic characterization. The catalysts featured a porous morphology and dual Cr3+ and –SO3H sites, which enabled the cascade conversion of glucose to EMF. PCP(Cr)-BA exhibited higher performance than PCP(Cr)-NA with an EMF yield of 23.1% in the conversion of glucose at 140 °C after 22 h in an ethanol/water system. In addition, the as-prepared catalyst exhibited a high stability in the current catalytic system for EMF production from glucose with a constant catalytic activity in a four-run recycling test without an intermediate regeneration step.
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yiying Li,Wenwu You,Jun Zhao,Xiaomin Zhang,Gencai Pan,Yanli Mao
In this work, Al 2 W 3 O 12 :1%Cr 3+ ,2%Eu 3+ with two discriminable dual emissive centers is synthesized. Both Eu 3+ and Cr 3+ ions can be excited efficiently by 465 nm. Photoluminescence excitation (PLE) spectra and photoluminescence (PL) lifetime indicate that there is no energy transfer (ET) between Eu 3+ and Cr 3+ ions. It is worth noting that the photothermal stability of Eu 3+ ions is much better than that of Cr 3+ ions. Specifically, the ratio of I Cr /I Eu decreases linearly with increasing temperature. Therefore, a blue-LED-excitable luminescent thermometer based on Cr 3+ /Eu 3+ co-doped Al 2 W 3 O 12 is proposed. This developed self-calibrated luminescent temperature sensor possesses the relatively high absolute and relative sensitivity (0.38 K -1 and 2.9% K −1 respectively) as well as good cycle stability among the previously reported TM/Ln-based luminescent; thermometers. These superior features of the developed self-calibrated luminescent thermometer (SCLT) make it a very promising candidate for temperature sensing applications.
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Advanced Optical Materials
·
2026
·
IF 7.2
Shuai Liao,Jing Li,Yaru Peng,Xi Chen,Tianshui Yu,Qi Qiu,Junhao Li,Yuxin Huang,Liangliang Zhang,Li Chen
Broadband near-infrared phosphor-converted light-emitting diode (NIR pc-LED) can be used in various fields, such as spectroscopy, non-destructive testing, and night vision lighting. How to obtain novel phosphors owned ultra-broadband is also a significant challenge. Here, a novel broadband CaMg 2 Lu 2 Ge 3 O 12 :Cr 3+ garnet phosphor is synthesized. CaMg 2 Lu 1.95 Ge 3 O 12 :5%Cr 3+ exhibits broadband emission in the 600–1100 nm with a full width at half maximum (FWHM) of 120 nm and excellent thermal stability, which can maintain 83%@423 K. The NIR pc-LED achieves a high photoelectric conversion efficiency of 18.47%@10 mA and an output power of 43 mW@100 mA. The spectral range is further extended by a synergistic strategy combining Sc substitution and co-doped Ni 2+ ions. CaMg 2 Sc 1.95 Ge 3 O 12 :5%Cr 3+ achieves an ultra-broadband emission in 600–1400 nm, with the emission peak redshifted from 750 to 850 nm, and the FWHM was broadened from 120 to 280 nm. CaMg 2 Lu 1.92 Ge 3 O 12 :5%Cr 3+ , 3%Ni 2+ exhibits broadband emission at 1460 nm of Ni 2+ ions in 1200–1900 nm with a FWHM of 316 nm under 450 nm excitation. Furthermore, the water, ethanol, and ethylene glycol liquids can be effectively distinguished as well as blood vessels, peas inside pods, fingernails within capsules, and embedded chips in campus cards can be clearly observed under the NIR pc-LED device.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Xinglai Yuan,Qinghu Wang,Wei Luo,Cuijiao Ding,Liang Huang,Yibiao Xu,Xiong Liang,Liping Pan,Shaobai Sang,Yawei Li,Haijun zhang,Jiangtao Li
Ca 2+ /Cr 3+ co-doped LaAlO 3 has been considered as important ceramic to achieve energy-savings in thermal equipment due to excellent infrared radiation (IR) performance. However, following problems restricted its industrial applications: one is the correlation between emissivity and the valence state of Cr which is not clear, then there is no quantitative evaluation of Cr 6+ content in ceramics. In this work, Ca 2+ /Cr 3+ co-doping LaAlO 3 ceramics have been fabricated. By adjusting Ca 2+ /Cr 3+ doped ratio (0 ≤ n (Ca 2+ )/ n (Cr 3+ ) ≤ 0.75), the “Cr 3+ →(Cr 4+ /Cr 6+ )” transformation ratio has been controlled. The results show that a higher concentration of Cr 4+ in the material can significantly enhance the emissivity, while Cr 6+ has no such effect. In addition, the Cr 6+ content was measured by leaching method and high-temperature volatilization methods, respectively. This work can be used to guide the fabrication of environment-friendly Ca 2+ /Cr 3+ co-doped LaAlO 3 -based ceramics with high emissivity in the field of energy-saving for thermal equipment.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Lu Chen,Sisi Yu,Guichang Shen,Shuai Tang,Tao Zhang,Ji-Guang Li,Qi Zhu
Broadband near-infrared (NIR) phosphors, as key materials in NIR phosphor-converted light-emitting diodes (pc-LEDs) for emerging applications, have recently attracted considerable attention. Herein, by selecting a comprehensive engineering strategy of co-substituting [Al 3+ -Al 3+ ] with [Mg 2+ -Ge 4+ ] units and increasing Cr 3+ concentration, a novel Cr 3+ -doped ZnAl 1.16 Mg 0.4 Ge 0.4 O 4 (ZA(MG) 0.4 :2 at.%Cr 3+ ) phosphor with continual broadband NIR emission was synthesized. The site occupation of Mg 2+ /Ge 4+ in ZnAl 2 O 4 is unraveled by Rietveld structure refinement and density functional theory (DFT) calculations. According to the photoluminescence behaviors, the formed defect clusters of Zn Al ’ -Cr 3+ -Ge Al · and Mg Al ’ -Cr 3+ -Ge Al · can not only introduce shallow defects to serve as new traps to obtain long-persistent luminescence but can also enhance the emission intensity at ∼689 nm and ∼694 nm. The quantity and scale of Cr 3+ -Cr 3+ pairs and Cr 3+ in distorted sites, which can improve the thermal quenching resistance and emission intensity in the range of 700–800 nm, can be accurately regulated by varying the concentration of Cr 3+ . Under 387 nm excitation, the designed material exhibits intensive NIR emission from 685 to 750 nm with a wide full-width at half maximum (FWHM) of 95 nm. The electroluminescence spectrum and potential applications of the NIR pc-LED prepared using ZA(MG) 0.4 :2 at.%Cr 3+ phosphor are also reported. The results promise a feasible strategy to develop NIR phosphors as NIR pc-LEDs lighting sources for applications in non-destructive detection and anti-counterfeiting.
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JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Jinlei Li,Chengcheng Wang,Junpeng Shi,Penghui Li,Zhenfeng Yu,Hongwu Zhang
Here, a kind of porous nanoparticles GdAlO 3 :Cr 3+ , Sm 3+ (GAO:Cr,Sm) which own magnetic resonance and long persistent luminescent properties have been synthesized. The spherical morphology and narrow size distribution would allow the GAO:Cr,Sm nanoparticles to be utilised as a drug carrier and the drug release results indicate that the GAO:Cr,Sm drug carriers have an excellent drug sustained properties. Applying the Cr 3+ and Sm 3+ coped with gadolinium aluminate as the NIR persistent luminescence center and the energy transfer resonance from Gd 3+ to Cr 3+ , these nanoparticles exhibit excellent NIR persistent luminescence at 732 nm under the UV irradiation of 254 nm and it can persist for about half an hour. In addition, they possess a longitudinal relaxivity (r 1 ) value of 4.75 mM −1 s −1 , which means that these nanoparticles could be applied for MR imaging as contrast agents. Carboxymethyl Chitosan was modified on the surface of GAO:Cr,Sm nanoparticles to make them owning excellent biocompatibility and low toxicity and these nanoparticles were successful to realize in vivo imaging. Hence, the well-defined nanoprobes of GAO:Cr,Sm exhibit great potential in biomedicine as trackable drug carriers and in vivo imaging agent due to the dual-model imaging property.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tong Feng,Yuanlin Jin,Zhangwen Long,Dacheng Zhou,Xiaqing Jiang,Bitao Liu,Jianbei Qiu
Phosphor conversion light-emitting diode (PC-LED) technology has become a focal point of research for portable near-infrared light sources in recent years. One of the crucial aspects is to develop phosphor materials that can be effectively stimulated by commercial available blue light. Unfortunately, efficient phosphors in the NIR-II that can be excited by commercial blue light are particularly scarce. In this study, Mg 4 Ta 2 O 9 :0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + (MTO:0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + ) phosphor was synthesized using the high temperature solid phase method, and its emission spectrum covered the first and second near-infrared windows (700–1200 nm). The internal quantum efficiency (IQE) and external quantum efficiency (EQE) are 88.7 % and 45.6 %, respectively, due to the synergistic effect of energy transfer and Li-ion modification. Additionally, the doping of Yb 3+ ions and Li + ions enhances the thermal stability of luminescence. The thermal stability of MTO:0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + and MTO:0.04Cr 3+ ,0.03Yb 3+ is 9.81 % and 14.43 % higher, respectively, than that of MTO:0.04Cr 3+ ,0.03Yb 3+ and MTO:0.04Cr 3+ . To evaluate its potential applications, we developed a prototype PC-LED utilizing MTO:0.04Cr 3+ ,0.03Yb 3+ ,0.07Li + phosphor as an emission emitter which demonstrated advantages in biomedical imaging, night vision, and non-destructive testing.
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Nanoscale
·
2017
·Vol. 9
·期 48
·19139-19144
·
IF 7.367
Jianjun Du,Haoying Ge,Quanyong Gu,Hong Du,Jiangli Fan,Xiaojun Peng
In this work, an N-T/gold nanoparticle system was assembled for the convenient and colorimetric identification of Cr based on its coordination chemistry with the thymine derivative (N-T). In addition to the visible colorimetric changes for the qualitative Cr identification, the A630 nm/520 nm values changed linearly with Cr concentration over a range of 0.5–2.5 μM and the detection limits reached 0.03 μM and 0.07 μM for Cr3+ and Cr2O72−, respectively, both of which satisfied the Cr water quality standards of the U.S. EPA, WHO and China. Furthermore, a more convenient method was developed for quantitative determination of Cr concentrations in practical samples based on the Eyedropper function in Microsoft's PowerPoint software, wherein the RGB (red, green and blue) value of the sample could be easily screened in the colorimetric card for a more accurate result with good recovery, avoiding complicated instrumentation.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-10
·
IF 5.3
Shi Jinyu,Wu Suyi,Xue Yu,Xie Qing,Danzeng Qunzeng,Liu Cui,Zhou Chuan-Hua
A convenient and sensitive dual-signal visualization method is constructed for detection of trivalent chromium ions (Cr 3+ ) based on fluorescent carbon dots (CDs) and glutathione-modified gold nanoparticles (GSH-Au NPs). The fluorescence of CDs can be quenched by GSH-Au NPs due to the inner filter effect. Cr 3+ induces aggregation of GSH-Au NPs because of the coordination with GSH on the surface of Au NPs, leading to the red shift of surface plasmon resonance absorption of Au NPs that provides a “turn-on” fluorescence and colorimetric assay for Cr 3+ . The fluorescence/colorimetric dual signal detection shows high sensitivity for Cr 3+ with wide detection linear ranges (0.5–70 μM for fluorescence detection and 2–50 μM for colorimetric detection) and low detection limits (0.31 μM for fluorescence detection and 0.30 μM for colorimetric detection). Besides, the method has high selectivity for Cr 3+ and can be used for detection of Cr 3+ in lake water and tap water samples, showing great potential for visual detection of environmental Cr 3+ . Graphical Abstract
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Science China-Chemistry
·
2025
·
IF 9.7
Wu Min,Nan Mingjun,Liu Shumin,Zhong Caihe,Qiao Lin,Zhang Huamin,Ma Xiangkun
With the increasing demand for energy storage technology, iron-chromium flow batteries (ICFBs) have been widely concerned because of their price advantage. However, the low electrochemical activity of Cr 3+ /Cr 2+ redox couples and the side hydrogen evolution reaction limit the industrial application of ICFBs. A multi-dimensional Bi/carbon composite electrocatalyst (Bi@C) for ICFB is designed and prepared to improve the electrochemical activity of Cr 3+ /Cr 2+ redox couples. Benefiting by using the Bimetal organic framework (Bi-MOF) with solid matrix as precursors, Bi nanospheres are highly dispersed on the Bi@C electrocatalyst that effectively enhances the electrochemical activity. The special morphology of Bi@C electrocatalyst helps the transfer of electrons and ions, significantly reducing the polarization of battery. Herein, the 3D porous carbon frames accelerate mass transfer, and the 2D carbon nanobelts and carbon layer coating on 0D Bi nanospheres improve the conductivity of Bi nanospheres. Therefore, the ICFB with multi-dimensional Bi@C electrocatalyst exhibits coulombic efficiency of 98.10% and energy efficiency of 79.14% at 140 mA cm −2 , which is higher than ICFBs with commercial graphite carbon electrocatalyst and with heat treatment carbon felt. This work provides a simple and economical method to fabricate a high-performance multidimensional Bi@C electrocatalyst for Cr 3+ /Cr 2+ redox couples, boosting the development of ICFBs.
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