ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hanyu Hu,Zeyu Lyu,Dashuai Sun,Shuai Wei,Jia Liu,Xin Wang,Luhui Zhou,Hongpeng You
Although there have been numerous reports on broadband near-infrared (NIR) emitting phosphors, their emissions are mainly concentrated in the range of 700–1000 nm (NIR-I). Herein, we successfully synthesized a broadband near-infrared phosphor CaMgGeO4:Cr4+(CMG:Cr4+) with an emission in the range of 1000–1600 nm (NIR-II). The introduction of Er3+ ions into CMG:Cr4+ resulted in a wider near-infrared emission phosphor CaMgGeO4:Cr4+,Er3+ (fwhm = 361 nm), compensating for the luminescence of 1500–1600 nm. More importantly, an energy transfer from Cr4+ to Er3+ ions has been discovered. Furthermore, a NIR pc-LED was fabricated by combining the CMG:Cr4+,Er3+ phosphor with a 590 nm chip. The changes in intensity and profile of the transmission spectra of light passing through different liquids reveal its potential application in organic compound recognition. This work opens a direction for the development of NIR-II phosphors.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 23
·7611-7618
·
IF 6.4
Xiaoxuan Guo,Bomei Liu,Rongyi Kuang,Weijiang Gan,Lin Huang,Jing Wang
Cr-activated phosphor-converted light sources have attracted widespread attention in various applications based on near-infrared (NIR) spectroscopy. Unfortunately, Cr ions usually face the issue of multivalence and typically exist in the valence of +3, which gives the emission mainly at NIR-I (700–1000 nm) and greatly limits its potential application. In this study, we propose the control strategies of site occupancy confinement and sintering atmosphere to synthesize Cr4+-activated Li2SrGeO4 (LSGO:Cr4+) phosphors. Interestingly, the as-optimized LSGO:Cr4+ achieves a NIR broadband emission peak at 1170 nm with an FWHM of 208 nm upon excitation at 680 nm and exhibits excellent thermal stability and high efficiency with the external quantum efficiency of 30.0%. Furthermore, the as-fabricated LSGO:Cr NIR phosphor-converted light emitting diode (NIR pc-LED) device shows a high power of up to 69.1 mW at 550 mA. Furthermore, as NIR-II (1000–1700 nm) light source, the phosphor successfully distinguishes deuterium and non-deuterium reagents. For example, the quantitative detection of H2O in heavy water (D2O) is demonstrated by NIR spectroscopy with a limit of detection (LOD) of 0.47 vol%. Our findings will open up a new avenue to develop novel Cr4+-activated NIR-II phosphors and NIR-II light sources.
研究领域:
材料科学
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光学工程
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分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yixin Sun,Yining Wang,Minliang Deng,Xiaole Xing,Yiying Zhu,Mengmeng Shang
Near-infrared-II (NIR-II) luminescence, which serves as a promising spectral window for biomedical applications and spectral analysis, has numerous potential applications. In this work, the NIR-II luminescence is realized in Li4SrCa(SiO4)2:Cr4+ phosphors. Under 465 nm excitation, the emission peak of Li4SrCa(SiO4)2:3%Cr4+ is located at 1215 nm and the full width at half maximum (FWHM) is more than 230 nm, covering the ultra-long range of 950–1600 nm. The photoluminescence spectra, diffuse reflectance spectra, Raman spectra and time-resolved emission spectra confirm the NIR-II luminescence mechanism. Furthermore, a novel post-reduction strategy is proposed to realize the leap-forward enhancement of NIR-II luminescence from Cr4+. By mutually substituting Sr2+ and Ca2+, a series of Li4Sr1+zCa1−z(SiO4)2:3%Cr4+ (z = −1 to 1) samples are prepared to investigate the universality and applicable conditions of the post-reduction strategy. Benefitting from the NIR-II emission of Cr4+, it has great application potential in optical temperature measurement and spectral analysis.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 18
·期 1
·2300717
·
IF 11
Yuzhen Wang,Gaochao Liu,Zhiguo Xia
Near-infrared (NIR) II region (1000–1700 nm) lighting sources possess special potential for temperature sensing and quantitative composition analysis. However, it is a challenge to tune the luminescence toward such long wavelength NIR-II emission. Herein, Cr 4+ ions occupation is designed and verified in olivine-type CaYGaO 4 as [CrO 4 ] tetrahedron by site occupancy confinement. Under 620 nm red light excitation, the phosphors display broadband NIR-II emission centered at 1330 nm with a full width at half maximum (FWHM) of 233 nm, resulting from spin-allowed 3 T 2 to 3 A 2 transition of Cr 4+ ions in T d symmetry. The optical thermometry application is demonstrated by decoding the spectral shift and decay times varying with temperature, and the maximum relative sensitivities are 5.82% and 0.78% K −1 , respectively. Furthermore, a flexible film containing CaYGaO 4 :Cr 4+ is fabricated to implement the non-invasive detections of fillet temperature and NH 3 concentration in ammonia. This work represents a step toward developing next-generation NIR-II luminescence materials and widens non-invasive detection applications.
研究领域:
材料科学
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光学工程
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生物医学工程
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无创检测技术
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分子成像
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Kunyang Cui,Qiuyu Cheng,Yuqian Wang,Lin Liu,Peng Jiang,M.A. Subramanian
The novel orange to red color Bi 24 Al 2- x Cr x O 39 (0≤ x ≤ 0.5) compounds were successfully synthesized by the solid state method. With the increase of Cr content, the colors of compounds are tuned from orange red to dark red. The X-ray diffraction patterns of all samples are indexed with cubic Bi 24 Al 2 O 39 structure with the space group of I 23. The oxidation state of Cr in the oxide is confirmed to be +4 valence by X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). Based on the analysis of Cr oxidation state and UV–Visible spectrum, the red hue is due to the d-d transition of Cr 4+ in tetrahedral sites. The as-synthesized red color compounds also show excellent stability in acid and base environments.
研究领域:
无机化学
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材料科学
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固体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Wenfeng Yuan,Xianke Sun,Meng Wu
A phosphor that emits both white light and broad near-infrared (NIR) light is of significant interest across various fields, as it enables both visual inspection and NIR spectroscopic detection. In this study, we designed Dy 3+ /Cr 4+ codoped CaLuGaO 4 phosphors that emit both white light and broad NIR light ranging from 1100 nm to 1700 nm when excited at 450 nm. The white light is produced by the 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 transitions of Dy 3+ . The broad NIR light arises from the 3 T 2 to 3 A 2 transition of Cr 4+ . Additionally, energy transfer from Dy 3+ to Cr 4+ occurs in the Dy 3+ /Cr 4+ codoped CaLuGaO 4 phosphors, allowing for tunable ratios of white light to NIR light by varying the concentrations of Dy 3+ and Cr 4+ . A phosphor-converted light-emitting-diode was constructed by encapsulating the synthesized phosphors around a commercial blue LED chip, demonstrating potential applications in lighting sources and non-destructive spectral analysis.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Fang Wen,Chenghang Li,Bo Zhang,Ke Qin,Xin Li,Mingyue Chen,Zhen Song
Rockery constitutes one of the significant elements of Chinese royal garden design, and it becomes an emerging interdisciplinary topic covering both science and art. In this work, we report an attempt to restore the color of the ancient rockeries by finding the appropriate inorganic pigments. Chromium is doped as activators into strontium melilites with varying Si/Ge ratio, and the synthesized powders give a series of color changing from ice blue to dark-sea green. With the structure and spectroscopic characterizations, we discuss the substitutions of Cr in Mg/Si/Ge sites of the melilite host. The Tanabe-Sugano diagram of 3d 2 configuration is employed to explain the change of diffuse reflectance spectra caused by Si/Ge substitution. With the work, we hope to inspire the interdisciplinary research and promote the rockery heritage restoration and protection.
研究领域:
材料科学
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文化遗产保护
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无机化学
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光谱学
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颜料化学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2026
·
IF 10.6
Gaochao Liu,Shuai Zhang,Yuzhen Wang,Zhiguo Xia
Near-infrared-II (NIR-II) photons hold great potential in assisting non-invasive imaging and optical signal sensing. However, the integration of broadband NIR-II light sources with photodetectors to improve the imaging sensitivity and spatial resolution is highly demanded. Herein, we have developed MgO-Li 2 SrGeO 4 :Cr 4+ composite ceramics, which demonstrate a broad NIR-II emission band centered at 1160 nm originating from spin-allowed 3 T 2 → 3 A 2 ( 3 F) transition of Cr 4+ . The incorporated nano-MgO particles serve as light-guiding channels while filling the pores and prevents the reduction of Cr 4+ , enhancing the external quantum efficiency and thermal conductivity of the composite ceramics to 53% and 17.8 W·m –1 ·K –1 , respectively. The dynamic wafer-scale luminescent ceramic wheel delivers a record broadband NIR-II emission output power of 1.9 W under 20 W·mm -2 red laser excitation, which facilitates imaging sensing of commercial PbS photodetectors by enhancing their photocurrents and signal-to-noise ratios. These results establish the feasibility of high-power broadband NIR-II light sources integrated with photodetectors, and further demonstrate the combination of intelligent algorithms toward high-resolution optical imaging.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jian Zhang,Li Luo,Weiren Zhao,Wei Zhang,ZhengFa Hu
Recently, near-infrared phosphors have received a lot of attention due to their wide application in the field of detection and analysis, and it is urgent to develop efficient broadband NIR phosphors. In this paper, a conventional high-temperature solid-phase method was used to prepare a novel near-infrared phosphor CaGa 4 O 7 :Cr 3+ , Cr 4+ , which provides two emission bands ranging from 600 to 1000 nm and 1100–1600 nm. Although there are only four and five coordination sites in the CaGa 4 O 7 (CGO) lattice, the doping of the Cr 3+ ions in the CGO causes the Ga–O tetrahedral distortion into an octahedron , providing a favorable environment for the emission of the Cr 3+ ions. Under blue light excitation, Cr 3+ emits luminescence in the NIR I region from 600 to 1000 nm with a half-height width of up to 148 nm. With increasing Cr ion concentration , more and more Cr 4+ preferentially occupy the four coordinated Ga 3+ sites, and the intensity of the ultra-broad emission band in the NIR II region (1100 nm–1600 nm) increases with a full width at half maximum (FWHM) of 262 nm. To further optimize the emission spectrum , Yb 3+ was codoped into CGO: Cr 3+ , Cr 4+ , the energy transfers from Cr 3+ to Yb 3+ in CGO was found, thus filling the gap between 1000 and 1100 nm in the CGO emission spectrum and obtaining a more complete ultra-wide spectrum. Moreover, the luminescence mechanism, energy transfer efficiency, and quantum yield are also studied in detail, and the ability of CaGa 4 O 7 :Cr 3+ , Cr 4+ , and Yb 3+ luminescent materials to achieve ultra-broadband efficient near-infrared emission was demonstrated.
研究领域:
材料科学
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光学材料
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发光光谱学
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无机化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 19
·2300517
·
IF 9
Yining Wang,Mengmeng Shang,Shuai Huang,Yixin Sun,Yiying Zhu,Xiaole Xing,Peipei Dang,Jun Lin
Cr 3+ -activated near-infrared (NIR) phosphors are one of the most influential candidates for the new generation of intelligent NIR phosphor-converted light-emitting diode (pc-LED) light sources. For spectral analysis, the broader the spectrum, the more useful information it contains. Herein, ultra-broadband Cr-activated Sc 2 O 3 nanophosphors, which exhibit NIR ultra-broadband from 650 to 1600 nm, are developed by the sol–gel method. This ultra-broadband emission originates from the presence of Cr 3+ and Cr 4+ , two luminescent centers confirmed by diffuse reflection spectra, electron paramagnetic resonance, time-resolved photoluminescence spectra, and temperature-dependent emission spectra. The nanophosphor exhibits excellent temperature-sensing performance with S A = 4.102% K −1 and S R = 1.855% K −1 . Co-doping Yb 3+ into Sc 2 O 3 nanophosphors builds the Cr 3+ -Yb 3+ -Cr 4+ model to bridge the spectral gap located at 1000 nm, forming a continuous NIR ultra-broadband spectrum ranging from 650 to 1600 nm for the first time. Moreover, the introduction of Yb 3+ improves the thermal stability of nanophosphors from 29.49% to 50.65% at 150 °C. The NIR transmission spectra of water, ethanol, and peanut oil demonstrate that Sc 2 O 3 :Cr 3+ -Yb 3+ -Cr 4+ NIR nanophosphors favor potential applications in spectral analysis. The construction of a Cr 3+ -Yb 3+ -Cr 4+ spectral bridge for realizing NIR ultra-broadband phosphors based on cheap blue LEDs provides novel and effective insights.
研究领域:
材料科学
·
光学材料
·
光子学
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固态照明
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传感器
·
光谱学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaowei Yang,Yanfei Zou,Chen Hu,Shikun Su,Zhenghang Wang,Houhe Dong,Wenying Teng,Bing Teng,Bingtao Zhang,Degao Zhong
Cr4+-activated phosphors are important candidate materials for NIR-II light sources, but providing a suitable lattice coordination environment for Cr4+ and achieving long wavelength broadband emission remains a challenge. In this work, a series of Cr4+-activated ABO2 (A = Li, Na; B = Al, Ga) phosphors were successfully prepared. Due to the presence of only tetrahedral coordination structures available for Cr4+ to occupy in the matrix crystal ABO2, the valence state and luminescence stability of Cr4+ are effectively guaranteed. Through the cation substitution design of A-site (Na → Li) and B-site (Ga → Al), the [BO4] tetrahedron is distorted and expanded, which degrades the symmetry of the Cr4+ coordination crystal field. Consequently, the central wavelength of the Cr4+ emission peak is tuned from 1280 to 1430 nm, and the fwhm is significantly extended from 257 to 355 nm. Thebroadband NIR-II light sources constructed with LiAlO2: 0.03Cr4+ and NaGaO2: 0.03Cr4+ phosphors verify their important potential applications in nondestructive testing and biological imaging.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
近红外光源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）