Materials Today Chemistry
·
2024
·
IF 6.7
Yuan Tang,Pengbo Lyu,Desheng Yin,Zhaoqi Liu,Nian Pan,Kai Li,Ying Ye,Changfu Xu,Lizhong Sun
Ultra-broadband near-infrared (NIR) lighting sources covering NIR Ⅰ to III regions are pivotal components for NIR spectroscopy devices. However, achieving ultra-broadband and efficient emission covering the entire NIR Ⅰ to III regions remains a significant challenge. To address this, we selected Mg 7 Ga 2 GeO 12 as host material to realize ultra-broadband NIR emission. Density functional theory calculations on formation energies confirmed the feasibility of doping both Ni 2+ and Cr 3+ within Mg 7 Ga 2 GeO 12 . Band structure calculations reveal a significantly reduced band gap upon the doping of Ni 2+ . Following that, we synthesized Mg 7 Ga 2 GeO 12 :Ni 2+ through conventional solid-state-reaction method. This phosphor exhibits broadband NIR emission with a full-width-at-half-maximum of 377 nm in the range of NIR II ∼ III (1100–2100 nm). To further enhance the emission efficiency, we co-doped Mg 7 Ga 2 GeO 12 :Ni 2+ phosphor with Cr 3+ . This co-doping strategy not only dramatically enhances the Ni 2+ emission intensity, but also extends the lower limit of emission band to 600 nm. However, a spectral gap around 1150 nm remains between Cr 3+ and Ni 2+ emission centers. To bridge this spectral gap, we employed LiScSiO 4 :Cr 3+ phosphor alongside Mg 7 Ga 2 GeO 12 :Ni 2+ ,Cr 3+ phosphor to fabricate a phosphor converted LED (pc-LED) with ultra-broadband NIR emission covering entire NIR Ⅰ to III regions. By utilizing this pc-LED as the lighting source for NIR spectral detection, multiple organic functional group signals can be identified simultaneously in NIR II and III bands from 1000 to 2100 nm. The performance of such an NIR pc-LED not only confirms the application potential of Mg 7 Ga 2 GeO 12 :Ni 2+ ,Cr 3+ phosphor in non-destructive spectral analysis but also underscores the feasibility of combining two phosphors to achieve ultra-broadband NIR pc-LEDs, rendering them suitable to be lighting sources for portable spectrometers.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hongshi Zhang,Jiyou Zhong,Fu Du,Lei Chen,Xiaoli Zhang,Zhongfei Mu,Weiren Zhao
Broad-band near-infrared (NIR) phosphors are essential to assembling portable NIR light sources for applications in spectroscopy technology. However, developing inexpensive, efficient, and thermally stable broad-band NIR phosphors remains a significant challenge. In this work, a phosphate, KAlP2O7, with a wide band gap and suitable electronic environment for Cr3+ equivalent substitution was selected as the host material. The synthesized KAlP2O7:Cr3+ material exhibits a broad-band emission covering 650–1100 nm with a peak centered at 790 nm and a full width at half-maximum (fwhm) of 120 nm under 450 nm excitation. The internal quantum efficiency (IQE) was determined to be 78.9%, and the emission intensity at 423 K still maintains 77% of that at room temperature, implying the high efficiency and excellent thermal stability of this material. Finally, a NIR phosphor-converted light-emitting diode (pc-LED) device was fabricated by using the as-prepared material combined with a 450 nm blue LED chip, which presents a high NIR output power of 32.1 mW and excellent photoelectric conversion efficiency of 11.4% under a drive current of 100 mA. Thus, this work not only provides an inexpensive broad-band NIR material with high performance for applications in NIR pc-LEDs but also highlights some strategies to explore this class of materials.
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Materials Chemistry Frontiers
·
2024
·
IF 6
Xue Meng,Zhijun Wang,Xiaoxue Huo,Mingxin Zhou,Yu Wang,Panlai Li
Near-infrared (NIR) light attracts attention because of its promising applications in night vision, anti-counterfeiting, biosensors, and measuring food composition and freshness. However, new NIR light sources with excellent thermal stability, higher efficiency, and superior photoelectric conversion efficiency are still a significant challenge. In this study, CaZrTaGaO7:0.01Cr3+, which can convert visible light into NIR light, was synthesized using a high-temperature solid-state method, and the crystal structure, morphology, site preference, and luminescence properties were investigated. Under 460 nm blue light excitation, the phosphor produces a broadband NIR emission in the 600–1100 nm region (λmax = 829 nm), with a full width at half maximum of 178 nm, an internal quantum efficiency of 90.7%, and an excellent thermal stability of 84.8% at 423 K. A NIR light emitting diode (LED) was prepared using a 460 nm LED chip and CaZrTaGaO7:0.01Cr3+, and the new compound can produce strong NIR emission (273 mW at 100 mA) with a photoelectric conversion efficiency of 11.8%. Photographed phosphor-converted LEDs (pc-LEDs) with a regular camera and captured pc-LEDs in operation in the dark. The results indicate that this material may provide a new option for high power NIR night vision and other applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhongyu Tong,Jiamin Li,Yuqing Yan,Feifeng Huang,Guanyu Zhu,Huanping Wang,Hua Yu,Degang Deng
The development of tunable broadband near-infrared (NIR) fluorescent materials with excellent luminescent properties is still a challenge for the next generation of intelligent NIR light sources. Here, a series of Cr 3+ doped magnetoplum type NIR phosphors were prepared by the high-temperature solid-state method. Their luminescent properties and the methods to broaden the luminescence bandwidth were discussed in detail. In BaAl 12 O 19 : Cr 3+ phosphor, Cr 3+ -Cr 3+ ion pair was constructed based on heavily doped Cr 3+ ions, so as to broaden its spectral emission range. With the increase of Cr 3+ doping concentration, the full width at half maximum (FWHM) of BaAl 12 O 19 : Cr 3+ sample increased from 18.5 nm to 93.7 nm. Furthermore, the crystal field environment of Cr 3+ ions in BaAl 12 O 19 : Cr 3+ phosphors was changed by cationic substitution (Sr 2+ substituted Ba 2+ ion site). The FWHM of NIR emission increases from 49.37 nm to 123.78 nm, and the internal quantum efficiency (IQE) increases from 65.6 % to 76.2 %, with good thermal stability ( I 373 K / I 298 K = 77.3 %). An intense NIR emission of 31.3 mW at 100 mA is produced by the phosphor-converted light-emitting diode (pc-LED), exhibiting a photoelectric efficiency of 15.3 %.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 25
·44694-44701
·
IF 5.6
Honglei Yuan,Huizhong Ma,Gaoliang Wang,Huanxia Jia,Liwei Wang
This study systematically investigates the structural and luminescent characteristics of LaSc 3 (BO 3 ) 4 :x %Cr 3+ and La (1-y) Gd y Sc 3 (BO 3 ) 4 :1.0 %Cr 3+ phosphors. X-ray diffraction confirms the formation of a pure hunter-type structure for all samples, with Cr 3+ occupying Sc 3+ sites and Gd 3+ substituting La 3+ , inducing lattice contraction. Luminescent analysis reveals that LaSc 3 (BO 3 ) 4 :Cr 3+ exhibits an emission at 980 nm under 430 nm excitation, attributed to the 4 T 2 → 4 A 2 transition of Cr 3+ in a weak crystal field. The substitution of Gd 3+ enhances photoluminescence intensity by 2.15-fold, and blue-shifts emission to 938 nm because of increased crystal field splitting and structural rigidity. The broadened full width at half maximum is also formed due to the enhanced degree of disorder in GdSc 3 (BO 3 ) 4 . Thermal stability studies show that GdSc 3 (BO 3 ) 4 :Cr 3+ retains 49 % intensity at 540 K, outperforming LaSc 3 (BO 3 ) 4 :Cr 3+ (41 %), supported by higher activation energy (ΔE = 0.338 eV vs. 0.296 eV). The improved thermal resistance is linked to lattice rigidity and reduced electron-phonon coupling. NIR-pc-LEDs fabricated with GdSc 3 (BO 3 ) 4 :Cr 3+ demonstrate superior radiant flux (68.7 mW at 200 mA) compared to La-based devices. These results highlight the critical role of host lattice engineering in optimizing Cr 3+ luminescence for high-power NIR applications.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yuefang Qin,Jiyou Zhong,Fu Du,Jun Wen,Zhiru Lin,Weiren Zhao
Broadband near-infrared (NIR) spectroscopy within 700–1100 nm generated by phosphor-converted light-emitting diode has multifunctional applications in night vision, bioimaging, and food quality analysis. To ensure the spectral coverage and saturability in this region, developing broadband NIR phosphors with tunable emission is desired. Herein, in this work, a tunable broadband NIR phosphor LiScO 2 :Cr 3+ was reported, which has a full width at half maximum (FWHM) of 165 nm, and an emission peak ranging from 807 to 870 nm depending on the Cr 3+ concentration varying from 0.5% to 5% when excited by 450 nm. Obviously, the significant red-shift of emission spectrum induced by the increase of Cr 3+ concentration is not derived from the weakening of crystal field , because the smaller Cr 3+ substituting larger Sc 3+ will cause lattice's shrink and enhancement of crystal field . To understand the mechanism of tunable emission induced by Cr 3+ concentration, the electronic properties, site occupation, local structure, and behavior of Cr 3+ ions were investigated in detailed. Thus, this work provides a valuable reference for the developing of tunable NIR phosphor based on the control of chromium ion concentration .
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Qinghong Meng,Jiaming Yuan,Xiangming Li,Wanjun Yu,Ji-Guang Li
Equimolar Ca2+ and Zr4+ doping was implemented to establish novel garnet-type Gd3‒xCaxAl2.95Ga2‒xZrxO12:0.05Cr3+ (x=0‒2.0) far-red (FR) phosphors. The quantum efficiency and temperature-dependent luminescence analysis successfully produced the optimal x=0.5 phosphor, which exhibited highly efficient (IQE=92.8%, EQE=31.6%) broadband FR-emission peaking at ~714 nm (full-width at half-maximum ~81 nm) and excellent thermal stability (95.5%@423 K) under 450 nm light excitation. Its performance is far superior to that of most reported Cr3+ activated FR-emitting garnet phosphors, and the emission spectrum can well superpose with the absorption band of the far-red phytochrome, making this phosphor have huge potential application in the construction of high-quality FR pc-LED used for plant lighting.
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CHEMISTRY OF MATERIALS
·
2026
·Vol. 38
·期 15
·7898-7913
·
IF 7.1
Li Jiazheng,Xu Jian,Ueda Jumpei,Back Michele,Kang Dongkyu,Zheng Ruilin,Majewska Natalia,Nakanishi Takayuki,Takahashi Kohsei,Tokumitsu Seika,Tanabe Setsuhisa
Cr 3+ -activated perovskite phosphors are promising
near-infrared
(NIR) emitters, yet their luminescent behaviors are often interpreted
primarily in terms of average crystal field effects. Herein, we investigate
Sr 1– n Ba n HfO 3 :Cr 3+ as a model system to elucidate the
role of local coordination. While synchrotron diffraction reveals
a continuous structural evolution from orthorhombic to cubic symmetry
with increasing Ba content, Cr K -edge XANES/EXAFS,
DFT-assisted local structure analysis, and spectral simulations reveal
that the Cr-centered local coordination environment evolves differently
from the average crystallographic framework. This difference between
average and local structural evolution strongly influences the luminescence
behavior, including excitation intensity ratios, R -line evolution, and thermal coupling between the 4 T 2 and 2 E states. Quantitative analysis shows a nonmonotonic
variation of C/B , a continuous nephelauxetic trend,
and a systematic decrease in both ΔE (E–T) and thermal activation energy ΔE a , indicating that local coordination variation plays
a critical role in the excited-state dynamics beyond a simple average
crystal-field description. The Sr-rich composition exhibits superior
thermal stability and emission efficiency, enabling proof-of-concept
phosphor-converted NIR LED (pc-NIR LED) demonstrations for short-range
NIR illumination, imaging, and material identification. This work
highlights local coordination engineering as a key strategy for designing
high-performance NIR-emitting materials.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Zhu Ange,Wang Jiawen,Xia Zhouyang,Qin Fanlei,Li Yinyan,Wang Jianfeng,Bartosiewicz Karol,Li Yan,Bai Gongxun
High-radiant-intensity broadband near-infrared (NIR) emitters are highly desirable for nondestructive testing, night-vision imaging, and information encryption. However, the exploration of phosphors that possess both high luminous efficiency and outstanding thermal stability continues to pose significant difficulties. Among various NIR phosphor systems, Cr 3+ -doped MgGa 2 O 4 (MGO:Cr 3+ ) exhibits characteristic broadband emission. Herein, Bi 3+ ions were incorporated as sensitizers into the MGO:Cr 3+ phosphor system, resulting in substantial enhancements in photoluminescence (PL), mechanoluminescence (ML), and thermal stability. The Bi 3+ co-doping enhanced the NIR PL intensity to 4.0 times and the ML output to 1.45 times those of the Cr 3+ singly doped reference, indicating a pronounced sensitization effect and improved energy transfer efficiency. Furthermore, the emission-intensity retention at 423 K improved from 49.29 to 82.88%, confirming a significant enhancement in the thermal stability of the NIR emission. A broadband NIR phosphor-converted light-emitting diode (pc-LED) assembled by coupling the Bi 3+ , Cr 3+ -co-doped MGO with a blue LED further demonstrated the material’s potential for nondestructive testing, night-vision imaging, and anti-counterfeiting.
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INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Qinghong Meng,Yuning Zhang,Xiangming Li,Wanjun Yu,Yaping Wang,Zhijun Xu,Ji-Guang Li
To modulate the structure and optical properties of Cr3+-activated Y3Al5O12 garnet with typical narrowband near-infrared (NIR) emitting, cation substitution was implemented to establish novel Y3–xCaxAl5–xSnxO12:yCr3+ broadband NIR phosphors in this work. Density functional theory calculations, Rietveld refinement, X-ray photoelectron spectroscopy, and UV–vis–NIR/photoluminescence spectroscopy analysis clearly elucidated that the equimolar Ca2+ and Sn4+ doping led to the expansion of the lattice and the enhanced distortion degree of the [(Al,Sn,Cr)O6] octahedron. They thus resulted in a reduction in the crystal-field magnitude and in a massive redshift and spectral broadening of the emission band. The optimal x = 1.5/y = 0.06 phosphor manifested wide-band NIR emission with a center at ∼764 nm and a full width at half-maximum of ∼135 nm, a high luminous efficiency (internal quantum efficiency = 75.6% and external quantum efficiency = 25.1%), and favorable thermal stability (74.5% at 423 K). The manufactured pc-NIR-LED device using this optimal phosphor exhibited satisfactory NIR output power (∼21.1 mW) and efficiency (8.53%), signifying that this garnet phosphor has potential for application in the construction of pc-NIR-LEDs for night vision, noninvasive medical diagnosis, and nondestructive detection.
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Advanced Materials Technologies
·
2022
·Vol. 8
·期 4
·2201181
·
IF 8.856
Bo-Mei Liu,Xiao-Xuan Guo,Lin Huang,Rong-Fu Zhou,Rui Zou,Chong-Geng Ma,Jing Wang
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have sparked tremendous interest in NIR spectroscopy. However, conventional NIR pc-LEDs with a narrow full-width at half-maximum (FWHM) and single-emission block the detection scope and detection accuracy for NIR spectroscopy analysis. Herein, a multicenter strategy is developed for the preparation of blue-light-excitable Mg 2 SnO 4 :Cr 3+ ,Ni 2+ phosphors with NIR dual-emission (λ em = 830/1480 nm, total FWHM = 532 nm). Benefiting from the unique NIR dual-emission, a ratiometric measurement system with a self-calibration function is established for highly precise and nondestructive detection. For the first time, a good linear relationship with a detection limit of 0.22 wt.% is achieved for quantitative, non-invasive detection of water/ethanol mixtures in the field of NIR spectroscopy applications. Additionally, a super-broadband pc-LED with a NIR output power of 16.1mW@300 mA is fabricated, demonstrating its applications in high-penetration imaging and anticounterfeiting. These results provide an approach to achieving NIR dual-emission phosphor, thereby opening a new avenue for exploring ratiometric NIR spectroscopy techniques.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Hengzhen Ye,Yanjie Zhang,Lu Wei,Hao Feng,Qiongyao Fu,Zhiqiang Guo
Background Chromium (Cr) mainly has two stable forms: Cr 3+ and Cr 6+ . Cr and its compound are widely used in the printing, dyeing, leather making, and metallurgy industry. They are evitably released into the environment and pose a significant threat to creatures, for instance, the excessive chromium (Cr) burden in the marine ecosystem is often harmful to fish. Intestinal microbiota greatly affects fish performance, but how waterborne Cr affects fish intestinal microbiota is unclear. To test the hypothesis that the waterborne Cr exposure could significantly affect fish’ intestinal microbiota homeostasis, and the effect was highly dependent on Cr concentration and speciation, the juvenile leopard coral grouper Plectropomus leopardus were exposed to waterborne Cr 3+ and Cr 6+ (0.1, 0.5 ppm) for 7 days, and the intestinal microbiota was determined by Amplicon sequencing of the 16S rRNA. Results In all Cr treatment groups, the alpha diversity of intestinal microbiota communities of P. leopardus was decreased. The phyla Proteobacteria, Firmicutes, Actinobacteria, Chloroflexi and Bacteroidetes were the dominant intestinal microbiota. The Chao index diversity significantly declined in Cr treatment group, indicating the intestinal microbiota community structure was changed. Among the dominant intestinal microbiota, Proteobacteria was most sensitive to Cr exposure, and it increased after xposure. The PICRUSt predicted that 0.5 ppm Cr 3+ expousure caused metabolism disordered in the intestinal of P. leopardus . Conclusions Waterborne Cr 3+ and Cr 6+ significantly disturbed intestinal microbiota homeostasis in P. leopardus , including their diversity, composition, and community structure. The metabolism level of intestinal microbiota in P. leopardus was decreased by Cr 3+ exposure. High concentrations of Cr 3+ may pose potential risks to the intestinal homeostasis of P. leopardus .
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