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
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 31
·10694-10702
·
IF 6.4
Yiwen Zhu,Yifan Yang,Yongqi Zhu,Yifan Chen,Zhenyu Liu,Fengmeng Lei,Hua Yu,Qinan Mao,Jiasong Zhong,Jing Wang
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have been attracting considerable attention as a new solid-state light source for night vision technology and biological imaging applications. Nevertheless, the requirement for toxic and concentrated HF in the previous synthesis of fluoride phosphors may cause environmental pollution and safety problems. Here, we report a feasible HF-free green synthesis method using a two-step process to prepare the Cr3+ source and a series of Cr3+, Li+ doped NIR phosphors using aqueous solution and methanol solution. X-ray diffraction analysis indicates that the pure target material was successfully synthesized. The luminescence intensity of K2ZnF4:Cr3+,Li+ is 2.58 times improved compared with K2ZnF4:Cr3+. Furthermore, the prepared phosphors show broadband emission in the range of 650 to 1000 nm, with a full width at half-maximum (FWHM) of 139 nm peaking at 783 nm. The NIR output power of the pc-LED fabricated with the K2ZnF4:Cr3+,Li+ phosphor and a 450 nm blue chip reaches 1007 mW at 320 mA. This work provides a promising phosphor for application as a NIR light emitting diode and has important implications for the green synthesis of HF-free Cr3+-doped fluorides in the future.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 28
·10292-10301
·
IF 8.067
Zixuan Wu,Xinxin Han,Juan Wang,Yayun Zhou,Ke Xing,Sheng Cao,Jialong Zhao,Bingsuo Zou,Ruosheng Zeng
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) is a prospective next-generation light source for smart and broadband NIR spectroscopy. However, the improvement of photoluminescence quantum yield and thermal quenching stability is still a crucial challenge for the pc-LED related broadband NIR phosphors. Herein, a highly efficient and thermally stable broadband NIR emitting fluoride phosphor Cs2KGaF6:Cr3+ is fabricated, which exhibits a full width at half-maximum (FWHM) of 110 nm centered at 782 nm. Notably, the phosphor exhibits an ultra-high internal quantum efficiency (IQE) of 90.2% and excellent thermal stability (I150 °C = 88.7%). The excellent anti-thermal quenching behavior is attributed to the relatively weak electron–phonon coupling effect in Cs2KGaF6:Cr3+ with a small Huang–Rhys factor of 2.17. Based on the prominent luminescent properties of the phosphor, a NIR pc-LED with a high photoelectric conversion efficiency of 22.05% is fabricated by combining the phosphor with a commercial blue LED chip. Moreover, the NIR pc-LED manifests distinguished performances in night vision security inspection, non-destructive testing, intelligent identification and biomedical imaging, indicating extensive application prospects for the as-prepared Cs2KGaF6:Cr3+ phosphor.
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高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Zurong Liao,Małgorzata Sójka,Jiyou Zhong,Jakoah Brgoch
Materials emitting near-infrared (NIR) light play a crucial role in the development of phosphor-converted light-emitting diodes (pc-LEDs) for applications ranging from fundamental science like spectroscopic analysis to highly applied uses like night vision and biological imaging. One class of materials that has garnered significant interest for these technical spaces is Cr3+-activated garnets due to their high efficiency and ability to operate at relatively high temperatures. However, their limited emission beyond 800 nm impedes their use as optimal blue LED-pumped NIR-emitting materials. In this study, we present a new garnet-type NIR phosphor, Na2CaZr2Ge3O12:Cr3+, that addresses this challenge─the material exhibits a long-wavelength emission (λem,max = 832 nm) and good thermal quenching resistance while maintaining an excellent internal quantum efficiency (IQE = 98%). These properties are attributed to a crystal environment reconstruction, where a crystal structure distortion is coupled to a weak crystal field, which is uncommon for most rigid garnet-type phosphors. Furthermore, the fabricated NIR pc-LED devices using this material demonstrate superior performance compared with devices employing well-known efficient NIR phosphors operating in this emission range. The light source is subsequently demonstrated in applications spanning night vision, bioimaging, and nondestructive analysis. This study not only provides insights into the luminescence properties of Cr3+-activated garnet materials with desirable performance but also highlights the practical application of NIR-emitting garnet phosphors.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yaming Yu,Ying Hong,Yanqi Wang,Xiangying Sun,Bin Liu
In this paper, for the first time, we used mecaptosuccinic acid (MSA) modified gold nanoparticles to detect Cr 3+ selectively. The procession is indicated by a red shift of the UV–vis absorption and a dramatic color change from red to blue. Under optimized conditions, this technique exhibits high selectivity to Cr 3+ over other tested heavy metal ions . The ratio between the absorbance wavelength at 650 nm and 520 nm (A 650 /A 520 ) is linearly proportional to the concentration of Cr 3+ in the range from 0.6 to 1.4 μM. The detection limit is estimated as low as 0.04 μM by UV–vis spectroscopy and 0.6 μM by naked eyes, respectively, making naked eye-detection of Cr 3+ feasible. This result is below the maximum accepted levels of chromium in drinking water (0.962 μM) by the World Health Organization. This simple approach is tried to detect trace Cr 3+ in real water samples and shows recoveries of 93–107%. The overall sensing assay is simple, cheap (by the use of MSA) and fast (the detection time is 10 mins). Therefore, it has the potential application to be the on-site, real-time and low-cost Cr 3+ sensor.
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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
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 35
·12526-12533
·
IF 4
Di Wu,Yan Li,Yu Liao,Xixiang Pan,Songbin Liu,Wanfang Zou,Jiaqing Peng,Xinyu Ye
Sunlight-like full-spectrum phosphor-converted light-emitting diodes (pc-LEDs) require near-infrared (NIR) emission bands to fill the spectrum gap and consequently propel their widespread applications. Although fluoride NIR phosphors have been increasingly investigated, balancing high quantum efficiency (QE), high thermal stability, and wideband NIR emission to obtain excellent overall performance in a single system is still a challenge for Cr3+-doped fluoride NIR phosphor and is significant for direct utilization. Herein, a high-efficiency and thermally stable broadband NIR emission was realized in a novel LiSrGaF6:Cr3+ fluoride phosphor benefitting from a relatively weak crystal field and electron–phonon coupling effect. Upon blue light excitation, the ultra-broad NIR luminescence ranging from 650 to 1150 nm can be achieved with an FWHM of 149 nm peaking at ∼813 nm. Furthermore, this system possesses a high QE of up to 76.88% and its emission intensity at 423 K still maintains 61.62% of its initial intensity at room temperature. An NIR output power of 42.82 mW and photoelectric conversion efficiency of 14.27% of NIR pc-LED devices have also been presented based on this NIR phosphor, demonstrating its possible application in compact nonvisible light sources. In addition, a highly continuous sunlight-like vis-NIR pc-LED was further constructed by employing a blue chip with commercial cyan (BaSi2O2N2:Eu2+), yellow (Y3Al5O12:Ce3+), red (CaAlSiN3:Eu2+), and this LiSrGaF6:Cr3+ NIR phosphor. The as-obtained pc-LED exhibits an ultra-broad spectrum ranging from 400 nm to 1000 nm, exhibiting a higher color reproduction with a color rendering index (CRI) of 95.1 and luminous efficiency (LE) of 50.22 lm W−1. These results indicate that LiSrGaF6:Cr3+ phosphor can be a promising NIR phosphor candidate for high-quality sunlight-like full-spectrum lighting and infrared night vision technology.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hengjuan Deng,Xinxin Han,Juan Wang,Dongxi Liu,Bingsuo Zou
Near-infrared (NIR) light source technology has been integrated into mobile devices with the advantage of portability to provide efficient analysis in many fields. Among them, NIR light in the 850 nm band has attracted much attention due to its unique advantages. In this study, an ultra-broad NIR emission from 700 to 1100 nm with the peak at 839 nm and full width at half-maximum (FWHM) of 151 nm is achieved in a novel tetra-fluoride RbAlF4:Cr 3+ excited by 465 nm blue light, exhibiting a relatively longer emission wavelength and wider FWHM compared with the reported Cr 3+ -doped fluoride phosphors. In-depth research on its crystal structure reveals that Cr 3+ is in a weak crystal field with a distorted octahedral environment, coupled with a strong electron-phonon coupling effect, which prompts the phosphor to exhibit long-wavelength and broad NIR light characteristics. However, these reasons also lead to relatively moderate internal quantum efficiency and thermal stability. Finally, a NIR phosphor-converted light-emitting diode (NIR pc-LED) was fabricated by combining this phosphor with a commercial blue chip, which shows great potential in non-destructive testing, night-vision observation, and biomedical imaging. This work provides new insights into the design of long-wavelength broadband fluoride phosphors.
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高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2025
·
IF 2
Lifang Yuan,Haoyi Wu,Yahong Jin
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have garnered considerable attention across various fields. Nevertheless, the development of long-wavelength NIR phosphors with high efficiency is still hindered. Herein, chromium-doped olivine-type phosphor LiScSiO 4 via a high-temperature solid-state reaction method is successfully synthesized. Under excitation by 470 nm, the as-obtained phosphor exhibits an ultrabroadband shortwave infrared (SWIR) emission centered at 1190 nm with a full-width at half maximum (FWHM) of 325 nm. The SWIR emission intensity is enhanced by controlling the hydrogen atmosphere, which suppresses the formation of Cr 4+ and promotes the transformation of Cr 4+ into Cr 3+ . The internal quantum efficiency (IQE) and absorption efficiency (AE) of LiScSiO 4 :Cr 3+ reach 73.46% and 46.5%, respectively. The Huang–Rhys factor of 11.4 indicates a strong electron-phonon coupling (EPC) effect, contributing to the large FWHM. Finally, encapsulating the as-obtained SWIR phosphors into a prototype pc–LED yields an SWIR output power of 20.07 mW at a driving current of 950 mA, rendering applications for night vision and online detection of water content in alcohol. Graphical Chromium-doped olivine-type phosphors have been prepared, showing ultrabroadband shortwave infrared (SWIR) emission at 1190 nm with a full-width at half maximum of 325 nm. Hydrogen atmosphere optimization enhances SWIR intensity by promoting Cr 4+ reduction to Cr 3+ . The internal quantum efficiency and absorption efficiency reach 73.46% and 46.5%, respectively, with the thermal stability of 60.9% at 100 °C.
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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
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
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Rui Xia,Kai-le Li,Peng Zhao,Xiao-xiao Yang,Jue Wang,Ke-wen An,Qing-hai Li,Hui Zhou,Yan-guo Zhang
Hydrothermal cracking, a thermochemical process operating at 180–220 °C and saturated pressure, offers a promising way to valorize Cr-contaminated agricultural wastes ( e.g. , maize straw, manure) into stable organic fertilizers. Using model compounds (cellulose, xylan, lignin) and three Cr salts (CrCl 3 , Cr(NO 3 ) 3 , Cr(CH 3 COO) 3 ), experiments at 180–220 °C and 30–90 min revealed that hydrothermal cracking achieved >63 % Cr immobilization in solid products, predominantly as stable oxidizable (OF) and residual (RESI) fractions. Nitrate additives (Cr(NO 3 ) 3 ) outperformed chloride and acetate salts, yielding 57.4 % RESI through redox cycling and complexation. Risk assessment (RAC <10 %, RI < 80) confirmed low environmental hazards, with prolonged reaction times (90 min) further reducing bioavailability. Mechanistic studies revealed that Cr immobilization primarily occurs through the interaction between organic matter and Cr, with surface functional group complexation as an additional immobilization pathway. The work provides actionable strategies for tailoring hydrothermal processes to address heavy metal contamination in circular agricultural systems, emphasizing anion-specific optimization for scalable remediation.
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高影响因子
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