SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Qingming Wang,Yingzi Tan,Nianhua Wang,Zhixiang Lu,Wenling Wang
A fluorescence probe based on thiosemicarbazide has been synthesized and well characterized by 1 H NMR, 13 C NMR, Elemental analysis , Electrospray ionization mass spectra . The probe 1 functions as a multitarget ion sensor, detect biologically and ecologically important Cd 2+ , PO 4 3− and Cr 3+ . Meanwhile, probe 1 displays selectivity for Cd 2+ over other metal ions and anions in DMF by emission spectrum. Interestingly, probe 1 has been explored to recognize PO 4 3− in CH 3 OH-H 2 O ( v : v = 1:9). The binding stoichiometry of probe 1 with Cd 2+ and PO 4 3− are 2:1 and 1:1, respectively, which are confirmed by Electrospray ionization mass spectra. Probe 1 is selective, sensitive and reversibility/reusability to Cd 2+ and PO 4 3− with the detection limit as low as 0.035 μM and 0.011 μM respectively. Besides, the designed probe 1 has shown potential applications in the area of photo-printing.
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Wei Wan,Man Li,Jingyan Jiang,Yifei Zhao,Yayun Zhou
Broadband near-infrared (NIR) light sources have emerged as crucial components in a wide array of technological applications, spanning from advanced imaging systems to night vision devices and healthcare therapy. The advent of light-emitting diodes (LEDs) has unlocked new opportunities for broadband NIR phosphor-converted LEDs (NIR pc-LEDs), characterized by improved efficiency, compact form factors, and low operating temperatures. However, high-performance NIR phosphors for high-power LEDs remain scarce. In this work, Cr 3+ -doped fluorides BaSiF 6 : x Cr 3+ (where x ranges from 2.5% to 15%) have been designed and synthesized, which offer high quantum efficiency and thermal stability to maintain ∼80% intensity at 450 K. Theoretical simulations demonstrate that BaSiF 6 , with a sufficiently large electronic bandgap of 7.8 eV, possesses the full potential to host NIR luminescent activators. Furthermore, molecular dynamics (MD) simulations validate its good thermal stability, enduring high temperatures exceeding 600 K annealing. The fabricated NIR pc-LED device using BaSiF 6 :Cr 3+ demonstrates high light output power and photoelectric efficiency under multiple driven currents, making it suitable for a wide range of applications as NIR light source. Capitalizing on the above merits, a prototype NIR transmission detector is demonstrated for potential applications in material inspection, medical diagnostics, and security systems. This research expands the repertoire of high-performance NIR phosphors for multifunctional use.
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Xiaoxuan Song,Jian Yang,Shuai Wang,Jia Song,Biying Bao,Hancheng Zhu,Duanting Yan,Changshan Xu,Yuxue Liu
Herein, ZMGGO:Cr 3+ nanoparticles were prepared by incorporating Mg 2+ ions into Cr 3+ -doped zinc gallogermenate nanoparticles through a hydrothermal path in combination with a vacuum heating. The average size of ZMGGO:Cr 3+ nanoparticles minishes from 59 to 12 nm with growing Mg 2+ concentration. Meanwhile their luminescence intensity at 696 nm of ZMGGO:Cr 3+ nanoparticles was only decreased by less than half of that of the undoped nanoparticles due to the decreased particle size after Mg doping. Meanwhile, the integral luminescence intensity of their entire emission band shows an increasing trend with increasing temperature due to the enhanced phonon sideband luminescence at high temperature. More important, it is found that the formation energies associated with Mg′ Ga -Ga o Zn and Zn′ Ga -Ga o Zn defects are −1.2 and 1.69 eV, respectively, suggesting the enhanced afterglow intensity of ZMGGO:Cr 3+ can be ascribed to Mg doping leading to the increased number of these anti-site traps. Finally, the dual-level time-gate optical encryption was demonstrated using phosphorescent inks containing ZMGGO:Cr 3+ nanoparticles with different afterglow intensities.
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DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Li Runze,Guo Yang,Yuan Shiling,Liu Gang,Lin Meng
Iron-chromium flow battery is considered one of the preferred technologies for large-scale energy storage facilities due to its advantages of low pollutability, less cost and high safety. However, the poor reversibility of the Cr 3+ /Cr 2+ redox reaction at the anode of iron-chromium flow batteries, the low activity and the susceptibility to hydrogen evolution reaction are the primary problems that restrict the development and application of this battery. On the basis of graphite felt electrodes, we prepared bismuth-lead oxides co-modified graphite felt electrodes via acid etching and electrodeposition method to improve the electrochemical performance in the reaction kinetics. The structural and catalytic properties of the materials were characterized and evaluated by scanning electron microscopy, X-ray photoelectron spectroscopy, X‐ray diffraction spectroscopy and electrochemical methods, respectively. The results show that with the help of the interaction between Bi and Pb elements, the successfully prepared modified electrode not only improves the reversibility and reaction rate of the electrochemical redox reaction of Cr 3+ /Cr 2+ but also effectively inhibits the occurrence of hydrogen evolution reaction.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jianjun Song,Haoyi Wu,Xiaoqi Liu,Shuyu Qin,Haoquan Li,Yahong Jin,Yihua Hu
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have garnered widespread research interest. The development of broadband NIR phosphors remains hindered by significant challenges, restricting their potential applications. In this work, a novel broadband NIR emitting CaHf 4 (PO 4 ) 6 : Cr 3+ (CHPO: Cr 3+ ) phosphor was synthesized. Under 472 nm excitation, the phosphor demonstrated a broadband emission centered at 925 nm with a full width at half maximum (FWHM) of 181 nm. The emission spectrum effectively encompassed the third-order frequency-doubling absorption band of C-H bonds and the second-order frequency-doubling absorption band of O-H bonds. A pc-LED was fabricated by combining CHPO: Cr 3+ phosphor with a 470 nm blue LED chip, achieving a near-infrared output power of 25.5 mW and an impressive photoelectric conversion efficiency of 6.4 % at a driving current of 120 mA. Finally, studies on night-vision, non-destructive testing, and solution concentration detection demonstrate the potential of the synthesized NIR phosphor for advancing broadband NIR pc-LED applications.
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DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Tao Yang,Lingxiang Chu,Yi Qin,Qiang Zhou,Jing Wan,Huaijun Tang,Yanqing Ye,Zhengliang Wang
The quest for efficient and heat-resistant near-infrared (NIR) phosphors to create advanced smart NIR lighting sources continues to pose a significant challenge. This study introduces a new fluoride phosphor, Cr 3+ -doped Cs 2 NaScF 6 , wherein the Cs 2 NaScF 6 host provides a weak crystal field suitable for Cr 3+ doping. This arrangement allows the production of a broad NIR emission peaking at 797 nm, coupled with a notable internal quantum efficiency of 90.8 % when excited by 446 nm blue light. Meanwhile, due to the relatively mild electron-phonon coupling effect and a high activation energy within this phosphor, the overall NIR emission intensity at 150 °C sustains 81.8 % of its level at room temperature. This highlights exceptional thermal stability in photoluminescence performance. Combining the Cs 2 NaScF 6 :Cr 3+ phosphor with a commercially available blue InGaN chip to construct a NIR light-emitting diode (LED) device, which exhibits efficient and stable NIR emission, making it suitable for non-destructive testing applications. These findings affirm that the Cs 2 NaScF 6 :Cr 3+ phosphor can function as a promising candidate to fabricate high-performance device for NIR spectroscopy application.
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高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Siyi Wei,Xiaomeng Wang,Jiaren Du,Hengwei Lin
Near-infrared (NIR) persistent luminescence (PersL) materials have garnered significant interest over recent decades due to their potential applications in bioimaging, nocturnal surveillance, and data encryption. Despite progress in steady-state NIR luminescence, designing materials with tunable near-infrared afterglow and dynamically controllable emission remains challenging. This study presents a series of NIR PersL solid solutions, referred to as Li1–xMg2xGa5–xO8:Cr3+, synthesized through high-temperature solid-state reactions. Modification of the composition through the chemical unit cosubstitution of Li+–Ga3+ units in solid solutions with Mg2+–Mg2+ counterparts facilitates the modulation of emission in the deep-red and NIR spectral regions, attributed to the characteristic Cr3+ transitions of the 2E → 4A2 and 4T2 → 4A2. These solid solutions derived from gallate spinels, specifically MgGa2O4:Cr3+ and LiGa5O8:Cr3+, were investigated to elucidate the correlation between structural characteristics and luminescent properties, as well as to explore the variations in trap distribution and density resulting from compositional alterations. This research illustrates the cosubstitution of chemical units in the advancement of NIR persistent phosphors, thereby promoting further exploration of luminescent materials with distinctive properties.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70441
·
IF 3.8
Yun Wang,Sihan Yang,Xuejiao Wang,Qi Zhu,Ji-Guang Li
The growing demand for near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) has posed significant challenges to the development of NIR-emitting phosphors with high quantum efficiency and thermal stability. A series of (Gd 3- x Ca x )(Hf x Sc y Al 3 Cr 0.05 )O 12 ( x + y = 1.95, x = 0.45–1.95, y = 0.0–1.5) garnet phosphors, designed by modifying both the Gd and Al sites of Gd 3 Al 5 O 12 , were fabricated by solid-state reaction and investigated for their structure and NIR luminescence. Ca 2+ and Hf 4+ /Sc 3+ /Cr 3+ would replace the Gd 3+ in [GdO 8 ] dodecahedron and the Al in [AlO 6 ] octahedron, respectively. The phosphors are effectively excitable by 452 nm blue light to emit NIR light, and a higher Ca 2+ /Hf 4+ content ( x value) would red-shift (from ∼732 to 750 nm) and broaden (full width at half maximum from ∼82.7 to 87.6 nm) the emission through weakening the crystal field of Cr 3+ . The x = 0.95 optimal phosphor was determined to have external/internal quantum efficiencies (%) of 26.5/54.9 and a thermal stability of 81.6%@423 K. The NIR pc-LED device based on the x = 0.95 phosphor achieved an output power of 34.71 mW and a photoelectric conversion efficiency of 12.01% at a driving current of 100 mA and showed the potential for non-destructive testing, night vision, and medical imaging.
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高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 16
·5469-5477
·
IF 7.393
Hao Cai,Shengqiang Liu,Zhen Song,Quanlin Liu
The practical application of near-infrared (NIR) phosphors is hindered due to their limited light emitting region and narrow bandwidth. Here, we report a series of Cr3+-doped olivine phosphors, (Mg1−xLix)(Mg1−xScx)GeO4:Cr3+, with tunable luminescence from NIR-I to NIR II based on crystallographic site engineering. By using a [Li+–Sc3+] unit substituting for a [Mg2+–Mg2+] unit, the NIR luminescence can be largely tuned from 940 nm to 1110 nm, and the corresponding FWHM can be modified from 236 to ∼300 nm. The internal quantum efficiency (IQE) and external quantum efficiency (EQE) of Mg2GeO4:1% Cr3+ were measured to be 48.19% and 16.38%, respectively. The photoluminescence of the phosphors matches well with the absorption of several functional groups. By measuring the NIR absorption of different liquids illuminated by NIR light from our phosphors, qualitative and quantitative analysis can be realized. These results suggest that the super-broad NIR luminescence of (Mg1−xLix)(Mg1−xScx)GeO4:Cr3+ has potential applications as light sources for nondestructive food analysis.
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高影响因子
Optical Materials Express
·
2022
·Vol. 12
·期 8
·2942-2953
·
IF 3.074
Kai Sun,Xiaomeng Yin,Zhenqing Li,Hui Lin,Ruijin Hong,Dawei Zhang,Zhijun Zhang,Guanhaojie Zheng,Guanhaojie Zheng,Yuchong Ding
MgAl2O4:Cr3+ far-red emitting ceramic phosphors were prepared by the solid-state reaction method. The photoluminescence characteristics, especially the luminescence thermal stability, thermal conductivity, and its application in phosphor-converted LEDs were studied. Under 450 nm excitation, the ceramic phosphors exhibited an emission range of 650-750 nm and showed a narrow-band emission peaked at 688 nm. It also shows 708 nm and 718 nm far-red emission, which matches well with the absorption peak of the plant phytochrome PFR. The luminescence thermal stability of MgAl1.99O4:0.01Cr3+ was excellent. The integral intensity of the two emissions peaked at 708 nm and 718 nm at 500 K can maintain 98.27% and 98.24% of the counterparts measured at room temperature, respectively, showing zero thermal quenching behavior up to 500 K. The thermal conductivity of the MgAl1.99O4:0.01Cr3+ ceramic was 10.3 W·m-1·K-1. These results indicate that MgAl2O4:Cr3+ ceramic phosphors can be applied in plant lighting when packaged onto 450 nm blue LED chips.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 40
·14100-14108
·
IF 7.059
Zhihao Zhou,Xiaodong Yi,Puxian Xiong,Xingyi Xu,Zhijun Ma,Mingying Peng
Near-infrared (NIR) persistent luminescence (PersL) materials have recently evoked considerable interest in the field of biomedicine, but the choices of efficient emitters for NIR PersL phosphors are rather limited. Herein, we report a new class of Fe3+-activated NIR PersL phosphor based on the LiGaO2 host, which exhibits an intense NIR PersL at around 748 nm and possesses an ultra-long PersL time of much longer than 26 h. The optical properties of this phosphor as well as the trapping and de-trapping processes, the trap characteristics, and the underlying PersL mechanism are comprehensively studied by means of photoluminescence (PL), PersL, electron paramagnetic resonance (EPR), thermoluminescence (TL), and X-ray photoelectron spectroscopies (XPS). It was found that the NIR PersL in this material is closely related to the oxygen vacancies. Furthermore, the penetration experiments and cytotoxicity tests of the biological tissue show that this material has great potential for bioimaging applications. Our achievement in the case of nontoxic Fe3+-activated LiGaO2 phosphors lays the foundation for the future design of Cr3+-free PersL phosphors with efficient NIR PersL towards versatile bioapplications.
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高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 11
·2302380
·
IF 9
Xiangyi Dai,Xikun Zou,Haoran Zhang,Weibin Chen,Chaowei Yang,Maxim S. Molokeev,Zhiguo Xia,Yingliang Liu,Xuejie Zhang,Mingtao Zheng,Bingfu Lei
Cr 3+ -doped phosphors are highly recognized in various fields for their remarkable luminous efficiency and spectral flexibility, including modern agriculture and horticulture. However, the shortage of suitable Cr 3+ -doped phosphors for far-red LED devices has inhibited their popularization in plant lighting. Herein, an innovative Cr 3+ -doped phosphor Ca 2 YAl 3 Ge 2 O 12 :Cr 3+ (CYAG:Cr 3+ ), achieving a broad far-red emission at 770 nm upon 450 nm blue light excitation is designed. The optimal CYAG:Cr 3+ phosphor exhibits a high internal quantum yield of 78.2% and low thermal-quenching behavior of 85%@373 K. Thus, the fabricated phosphor-converted LEDs (pc-LEDs) for plant far-red lighting have a high output power of 33.3 mW and photovoltaic conversion efficiency of 11.5% at 100 mA. The potential of CYAG:Cr 3+ in plant lighting is assessed by supplementing the far-red lighting of Italian lettuce with fabricated pc-LEDs, and the biomass of Italian lettuce is significantly increased by 33%. The successful development of CYAG:Cr 3+ phosphors provides a high-quality option for plant far-red light devices and further stimulates the development of new Cr 3+ -doped plant-lighting phosphors.
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高影响因子
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