CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 22
·36114-36122
·
IF 5.6
Mengchao Shen,Li Li,Mengnan Zhai,Zhongmin Cao,Faling Ling,Xianju Zhou,Yongjie Wang,Xiantong Tang,Xiaobing Luo,Yongbin Hua
In this study, a novel near-infrared (NIR) emitting double-perovskite phosphor SrLaMgSbO 6 :Cr 3+ (SLMSO: Cr 3+ ) was prepared through a solid-state reaction method. Through systematic investigation of Cr 3+ concentration-dependent photoluminescence properties, we identified SLMSO:0.02Cr 3+ as the optimal concentration composition exhibiting superior optical characteristics . Comprehensive characterization techniques were employed to analyze the crystal structure, morphological features, excitation-emission profiles, and crystal field environment of the developed phosphor. The as-synthesized phosphor demonstrates remarkable broadband NIR emission centered at 850 nm upon 520 nm excitation, which is attributed to the 4 T 2 → 4 A 2 transition of Cr 3+ ions in the weak crystal field environment of the double-perovskite host. A particularly noteworthy finding is the exceptional thermal stability of the material, maintaining 86.7 % of its room-temperature (298 K) emission intensity at 423 K. Finally, we fabricated a NIR pc-LED device by integrating the optimized SLMSO:0.02Cr 3+ phosphor with a commercial 530 nm LED chip, promising applications in night vision technology and penetration imaging systems . The combination of broadband NIR emission, superior thermal stability, and efficient excitation by commercial LED chips positions this novel phosphor as a significant advancement in the field of NIR-emitting materials for practical applications.
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xiaozhong Wu,Decai Huang,Qiuming Lin,Lei Han,Weixiong You,Jing Zhu,Xinyu Ye
The research on near-infrared (NIR) phosphors has become a trending topic, as their optical properties directly impact the performance of the NIR phosphor-converted light-emitting diode (pc-LED). NIR pc-LED has emerged as a multifunctional light source across various fields due to its unique advantages of high penetration and invisibility. Herein, a peculiar broadband NIR-emitting phosphor is presented, RbAl3P6O20: Cr3+ (RAPO: Cr3+), with an NIR emission range from 650 to 1000 nm and peaking at ∼785 nm with a full-width at half-maximum (fwhm) of ∼1900 cm–1. Gaussian fitting analysis reveals that broadband emission originates from Cr3+, occupying two different octahedral sites in the host. The optimized phosphor RAPO: 0.08Cr3+ exhibits an internal quantum efficiency of 60% and excellent thermal stability (90% at 423 K). The application of pc-LED devices was evaluated by assembling a RAPO: 0.08Cr3+ phosphor with an InGaN-based LED (450 nm), achieving a remarkable NIR output power of 27.9 mW at 120 mA. The results demonstrate that RAPO: Cr3+ is an optimistic phosphor for NIR photoelectron (pc-LED) light sources.
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PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Jiyou Zhong,Chaojie Li,Weiren Zhao,Shihai You,Jakoah Brgoch
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) technology has attracted considerable interest as a next-generation light source for emerging NIR spectroscopic applications. However, discovering efficient broadband NIR phosphors necessary to access the desired long-wavelength (λem ≥ 800 nm) energy window remains a challenge. Here, a new phosphate phosphor, KGaP2O7:Cr3+, emerged from a fundamental study of the AMP2O7 (A = Li, Na, K; M = Al, Ga, Sc, In) family. This material combines all of the requisite properties for the efficient generation of NIR photons, including limited defect formation, minimal electron–phonon coupling, a subtle octahedral site distortion, and well-separated transition metal substitution sites. Photoluminescence spectroscopy indicates that this material emits from 700 to 1100 nm (λmax = 815 nm) with a full width at half-maximum (fwhm) of 127 nm or 1874 cm–1. Exciting the material with a blue LED reveals a quantum yield of 74.4% with an absorption efficiency of 44.8%, resulting in an excellent external quantum efficiency as high as 33.3% from the as-prepared sample. A prototype NIR pc-LED device generated an output power of 473.8 mW and a high photoelectric conversion efficiency (10.7% under 500 mA), demonstrating the potential of applying this phosphor in blue LED-based NIR spectroscopy.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Mianhong Chen,Hua Fan,Zuizhi Lu,Jiayang Song,Xinguo Zhang,Qi Pang,Peican Chen,Liya Zhou
Stable and efficient broadband near-infrared (NIR) emitting phosphors are vital for the next-generation NIR sources. However, it still remains challenging to construct such phosphors, particularly those with a NIR-II window. In this work, using the Cr 3+ -Yb 3+ energy transfer (ET) strategy, the as-synthesized Ca 2 ScTaO 6 :Cr 3+ , Yb 3+ phosphor retains 86.2% of the initial luminescence intensity of Yb 3+ at 373 K with characteristic emissions of both activators ranging from 700 nm to 1200 nm. The occupation of Cr 3+ into both Ta 5+ and Sc 3+ sites is confirmed by X-ray diffraction, time-resolved emission spectrum, and crystal structure. The efficient ET from Cr 3+ to Yb 3+ is revealed by the diffuse reflection spectrum, steady-state and transient fluorescence. As a result, it contributes to the excellent performance of the phosphor. Based on the optimized phosphor, a NIR light-emitting diode is fabricated and demonstrated its advantage in imaging and potential application in information encryption. The result highlights ET as a robust strategy to construct efficient NIR phosphor.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xin Xie,Wanyin Ge,Ye Tian,Qian Zhang,Maohao Yang,Chenge Wu,Peng He,Honglei Yin
To develop continuous broadband emission near-infrared (NIR) phosphors compatible with blue LED chips, numerous Cr 3+ -Yb 3+ co-doped phosphors have been synthesized. However, the emission spectra of Cr 3+ vary significantly across different matrix materials, while Yb 3+ maintains a relatively stable emission spectrum. This variation leads to notable luminescence depressions between 850 and 900 nm in many Cr 3+ -Yb 3+ co-doped phosphors. To address this emission spectrum gap, we utilized Cr 3+ as a sensitizer and introduced Nd 3+ as the luminescence center within the La 3 Sc 2 Ga 3 O 12 matrix material, establishing a Cr 3+ -Nd 3+ energy transfer channel. Under 480 nm excitation, we tuned emission peaks at 800 nm (Cr 3+ ) and 881 nm (Nd 3+ ). The stable NIR emission of Nd 3+ effectively compensates for the missing spectrum in Cr 3+ -Yb 3+ co-doping. The Cr 3+ -Nd 3+ energy transfer process was thoroughly analyzed using diffuse reflection spectrum, excitation spectrum, and fluorescence decay curves. The LSGO:0.125Cr 3+ , 0.03Nd 3+ compound with the best optical performance was packaged with a 480 nm LED chip to create a NIR light source. At a working current of 10 mA, it achieved a photoelectric conversion efficiency of 9.45 %, demonstrating its potential for applications in non-destructive detection and luminescence thermometry. This work presents a novel strategy for tuning NIR spectral distribution and developing continuous broadband NIR phosphors.
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OPTICS LETTERS
·
2025
·Vol. 50
·期 21
·6533-6536
·
IF 3.3
Yu Zhang,Yu Zhang,Kai Li,Kai Li,Hala Muji,Hala Muji,Qixu Tian,Qixu Tian,Yuansong Gao,Yuansong Gao,Narimai J,Narimai J,Xinyu Gu,Xinyu Gu,Fengqi Zhao,Fengqi Zhao,Fengqi Zhao,Kefu Chao,Kefu Chao,Dengfeng Peng,Dengfeng Peng,Dengfeng Peng,Dengfeng Peng
In this study, a novel, to the best of our knowledge, Cr3+-doped garnet fluorescent material (Ca2TbScGa2Ge2O12:Cr3+, CTSGGO:Cr3+) in high-entropy oxides has been successfully synthesized by a high-temperature solid-phase method and systematically investigated in terms of its photoluminescence (PL) and mechanoluminescence (ML) properties. The material shows broadband near-infrared emission in the 700–900 nm range when excited by 460 nm blue light, with a half-peak width of 116 nm. Additionally, it achieves NIR-visible synergistic emission in both PL and ML modes through efficient energy transfer from Tb3+ to Cr3+ (with a transfer efficiency of 75%). When encapsulated in PDMS, the material exhibits dual ML responses: 450–650 nm (Tb3+) and 650–900 nm (Cr3+) under mechanical stress. It was integrated with commercial blue LED chips and PDMS for practical applications in night vision imaging, tissue penetration visualization, and multiple-mode optical anti-counterfeiting. This work offers new insights for designing broadband NIR-emitting materials and developing photoelectronic and force-responsive devices.
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PubMed
高影响因子
Advanced Optical Materials
·
2026
·Vol. 14
·期 36
·e71763
·
IF 7.2
Mengdi Xu,Xinquan Zhou,Tinglin Mou,Tao Huang,Zhongyuan Li,Lixin Ning
Achieving efficient ultra-broadband near-infrared (NIR) emission in Cr 3+ -doped traditional spinel remains a challenge owing to the inherent rigidity of the host lattice and the dominant strong crystal-field effect. Herein, we demonstrate multiple crystal-field engineering to realize efficient broadband NIR emission in Cr 3+ -activated spinel phosphors. A low-symmetry Mg 4 InSbO 8 spinel with mixed-cation octahedral sublattices is employed to construct diversified weak crystal-field environments for Cr 3+ . Through synergistic site and valence regulation, the occupation of Cr 3+ at various octahedral sites is optimized, while the unfavorable formation of high-valent Cr 4+ is suppressed. Specifically, partial Ga substitution in In/MgO 6 octahedra mitigates lattice mismatch and weakens electron-phonon coupling. Meanwhile, LiF acts as a flux agent and charges compensator under an N 2 atmosphere to further restrict Cr 4+ generation. The optimized phosphor exhibits a broadband NIR emission centered at 783 nm with a full width at half maximum of 203 nm and an internal quantum efficiency of 89.1%. The integrated emission intensity at 423 K remains 46.2% of the intensity at room temperature. The as-fabricated phosphor-converted light-emitting diode (pc-LED) enables clear target imaging at a distance of 2.7 m through dense smoke at night, outperforming a conventional visible pc-LED that achieves only an imaging distance of 0.4 m.
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Energy Material Advances
·
2026
·
IF 17.4
Muwei Ji,Huixian Wei,Ketong He,Qing Liu,Feng Bao,Chenxi Wang,Hong Xia,Yibing Song,Liangsheng Hu,Fushen Lu
Hydrogen obtained via water electrolysis by using green power is clean energy for oursustainable development. However, the oxygen evolution reaction (OER) on the counter reactionremains a greater challenge due to the high overpotential and serious corrosion. Aiming to obtainelectrocatalysts with high activity and stability at high current densities, herein, Cr was introducedinto NiFeOx to form NiFe2-xCrxO4 on nickel foam (NF) through a straightforward synthetic approach.The NiFe2-xCrxO4 electrode performed high activity at 1.5 A cm-2 with an overpotential of 393 mVand stable operation for 200 hours at 1000 mA cm-2. The DFT simulations reveal the Cr-enhancedpolarization of oxygen species and the modulation of electron state enabling the electrocatalyst towithstand at a higher potential. The NiFe2-xCrxO4 ||Ni water electrolyzer operated stably over 2400hours at 1000 mA cm-2 and at higher current densities (2000-10000 mA cm-2) over 100 hours.Incorporating of Cr into NiFeOx enhances the electrochemical activity and long-term stability of theelectrodes, thereby providing valuable insights for the design and fabrication of high-performanceand durable anodes.Keywords: NiFexCr2-xO4, stability, Cr cation, oxygen evolution reaction, high current density.
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ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 32
·44167-44174
·
IF 7.8
Cai Yutong,Liu Jianhua,Bai Chen,Duan Jiarui,Wang Deyin,Wang Yuhua
The crystal phase, morphology, photoluminescence properties, and practical application potentials of a new phosphor, CaLaMgTaO 6 :Cr 3+ , were investigated. The optimized phosphor exhibits intense, broad emission peaking at 815 nm upon 470 nm excitation, with an internal quantum efficiency as high as 63.1% and full width at half maximum of 171 nm. This emission originates from the 4 T 2 → 4 A 2 electronic transition of Cr 3+ ions in a weak octahedral crystal field. The emission intensity remains 60% at 378 K. Such moderate thermal stability originates from the large Stokes shift, which is further corroborated by the low activation energy of 0.20 eV. Furthermore, a near-infrared lamp was packaged via coating CaLaMgTaO 6 :Cr 3+ phosphor on a 450 nm LED chip. The prepared lamp is proven to support multiscenario applications, including clear, noninvasive vascular imaging in biological tissues and night vision imaging under dim light conditions.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xufeng Xiong,Jiayong Si,Songbo Li,Wencong Yi,Yuheng He,Gemei Cai
Phosphor-converted LEDs (pc-LEDs) operating in the near-infrared (NIR) region are gaining attention as promising next-generation light sources for spectroscopy, bioimaging, and smart agriculture. However, developing NIR phosphors with emission spectra that match the absorption of phytochrome far-red (P fr ), a key photosensitizing pigment regulating plant photomorphogenesis, remains a major challenge for indoor agriculture applications. This study successfully synthesized the near-infrared phosphor GaBO 3 :Cr 3+ . Upon excitation at 420 nm, GaBO 3 :Cr 3+ shows an emission maximum centered at 710 nm, and the full width at half maximum (FWHM) is 108 nm, demonstrating high spectral compatibility with P fr . Compared to room temperature intensity, the phosphor retains 85.6% of its emission intensity at 373 K. In conjunction with a 420 nm LED chip, GaBO 3 :Cr 3+ was employed to construct pc-LED devices for applications in night vision, non-destructive imaging, and plant growth experiments. Under near-infrared pc-LED illumination, Bidens pilosa exhibited a 133% increase in growth rate compared to natural sunlight conditions, confirming the efficacy of this NIR light source for plant growth promotion. This work demonstrates the potential applications of GaBO 3 :Cr 3+ phosphor for night vision, non-destructive imaging, and plant lighting.
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Liping Song,Sisi Liang,Wendong Nie,Xianguo He,Jie Hu,Fulin Lin,Haomiao Zhu
Recent decades have witnessed a major development in broadband near-infrared (NIR)-emitting phosphors because of their potential applications in real-time nondestructive examination. These applications require the emission spectra of phosphors to be as broad as possible for efficient performance. Therefore, a blue-light excited LiInF4: Cr3+ phosphor with a NIR emission covering 700–1400 nm is successfully synthesized. Under 470 nm excitation, it shows broadband emission peaked at 980 nm with the full-width at half maximum of 210 nm. The structure and crystal field environment are investigated in detail, and the LiInF4: Cr3+ possesses a weak crystal field strength and strong electron–phonon coupling. An efficient NIR phosphor-converted light-emitting diode (pc-LED) is fabricated by the prepared LiInF4: Cr3+ phosphor and commercial blue diode chip, generating a NIR radiant flux of 5.54 mW at 150 mA drive current. Finally, the NIR pc-LED is successfully applied to identify the blood vessel distribution of the hand. This work suggests the potential of LiInF4: Cr3+ phosphor in applications.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
生物医学成像
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Maja Szymczak,Ke Su,Lefu Mei,Marcin Runowski,Przemyslaw Woźny,Qingfeng Guo,Libing Liao,Lukasz Marciniak
Luminescent manometry has gained significant popularity in recent years due to its capability to provide in situ pressure measurements in a remote manner. Therefore, there is a growing need to identify phosphors with pressure-dependent spectroscopic properties that can be utilized to develop highly sensitive pressure sensors operating over a wide pressure range. Hence, we present a novel temperature-invariant luminescent manometer based on Cr3+ ion emission in pyroxene Ca0.8Sr0.2MgSi2O6:Cr3+. We utilized two readout modes, including an innovative luminescent pressure sensing ratiometric approach based on the broad emission band associated with the 4T2g → 4A2g electronic transition of Cr3+ ions. This approach provided an exceptionally high sensitivity of SR = 50.7 ± 0.5% GPa–1 and ensured temperature-independent pressure measurements, thus offering highly reliable readouts. Furthermore, the proposed readout mode, which leverages changes in luminescence kinetics, demonstrated high sensitivity at high pressure at around 5 GPa (SR ∼ 8 ± 0.2% GPa–1) surpassing the performance of luminescence kinetics-based manometers reported to date. Consequently, Ca0.8Sr0.2MgSi2O6:Cr3+ emerges as a highly promising phosphor with significant application potential for pressure sensing across a broad pressure range.
研究领域:
光学传感
·
材料科学
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发光材料
·
压力测量
·
固态物理
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