Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 3
·994-1002
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IF 7.393
Shihai Miao,Yanjie Liang,Yan Zhang,Dongxun Chen,Shao Yan,Jingwei Liu,Xiao-Jun Wang
Near-infrared (NIR) phosphor-converted light-emitting diodes (LEDs) are becoming an efficient and promising solution for high-power NIR light sources, which have shown a broad range of possible applications in the fields of agriculture, food analysis and biomedical diagnostics. However, there is a long-standing challenge to develop tunable and thermally stable NIR-emitting phosphors as luminescence converters in the design of low-cost, compact and high-efficiency NIR LEDs. Here, we report a tunable broadband NIR photoluminescence in Na3Sc2(PO4)3:Cr3+ phosphors via Ga3+ co-doping and explore their application in NIR LEDs. With the fine-tuning of the doping concentration of Ga3+ ions from 0 to 6%, the NIR luminescence of the obtained phosphor can be tuned from sharp line emission at 694 nm (2E → 4A2 transition of Cr3+) to broadband emission centered at 750 nm (4T2 → 4A2 transition of Cr3+) upon blue light excitation. In the meanwhile, the NIR emission intensity at 100 °C and 150 °C can retain ∼100% and ∼84% of the initial value at room temperature when the Ga3+ content is determined to be 6%, leading to thermally stable broadband NIR emission in the as-synthesized Na3Sc2(PO4)3:Cr3+,Ga3+ phosphors. The NIR LEDs constructed by combining the commercial blue LED chips with the optimized NIR phosphors can generate broadband emission in the wavelength range of 600–1000 nm and deliver ∼4 mW of NIR output power with a power conversion efficiency of 2.6% at a drive current of 60 mA. The potential of the fabricated NIR LEDs as a lighting source for night vision and vein imaging is also demonstrated. The outcomes here highlight promising potential for Na3Sc2(PO4)3:Cr3+,Ga3+ as phosphor-downconverted light emitters in the design of high-power NIR LED devices for practical applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Di Qian,Yahong Jin,Lifang Yuan,Haoyi Wu,Yanmei Li,Yihua Hu
The ever-increasing demand for portable near-infrared (NIR) light sources has presented significant challenges in the development of highly efficient and thermally stable NIR phosphors. To address this challenge, we have employed a cation-substitution strategy. we incorporated indium (In) and gallium (Ga) atoms into the B-sites of the garnet-host lattice in a 1:1 M ratio. Through strategic placement of In and Ga atoms at octahedral sites, an order-disorder transition was induced. This innovative method has significantly improved the phosphor's performance characteristics. The optimized Cr 3+ -doped gadolinium indium gallium garnet (GIGG) exhibits an emission peak at 770 nm with a maximum full width at half-maximum (FWHM) value of 135 nm. Its internal quantum efficiency (IQE) reaches 96.17 %, while the external quantum efficiency (EQE) for this garnet-based material achieves 50.26 %. Furthermore, at 423 K, the material's luminescence intensity remains at 96.44 % of its initial value, demonstrating remarkable thermal stability. These characteristics render it an ideal candidate for energy-efficient down-conversion layers in photonic devices. In follow-up investigations, a NIR phosphor-converted light-emitting diode (pc-LED) fabricated using the optimized GIGG:Cr 3+ delivered a NIR output power of 241.04 mW under 960 mA drive current and achieved a photoelectric conversion efficiency (PCE) of 15.25 % at 30 mA, thus demonstrating its suitability for various photonic applications. This study presents an efficient broadband NIR garnet-based phosphor and provides new opportunities for advancing next-generation, energy-efficient, and compact solid-state NIR light sources.
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JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Xingyu Lai,Mengqi Lyu,Baoling Tang,Wei Li,Haoran Zhang,Jianle Zhuang,Chaofan Hu,Mingtao Zheng,Xuejie Zhang,Bingfu Lei
Near-infrared (NIR) light is extensively utilized in plant lighting due to its ability to promote plant growth and increase photosynthesis efficiency. To optimize crop yield and morphology, developing a NIR lighting source with high efficiency and long-term operating stability is essential. However, it's still a formidable challenge. Herein, we have prepared a Gd 3 Ga 2 Al 3 O 12 :Cr 3+ phosphor glass films on sapphire (GGAG-PGF) with external quantum efficiency up to 40 %, as well as excellent thermal stability (96.7 %@150 °C of the initial integrated intensity at 25 °C). When the drive voltage and current are 21 V and 240 mA, the surface working temperature of the prepared GGAG-PGF based LED device is 117.2 °C, showing a 29 % drop compared with that the conventional pc-LED (164.9 °C). Moreover, it gives an excellent long-term operating stability after 21 days of continuous high-power working. Benefitting from the suitable spectral profile and excellent luminescence performance of GGAG-PGF, the potential application in plant lighting is evaluated through supplementing the NIR lighting for Italian lettuce with the as-fabricated GGAG-PGF based LED. The results demonstrated it can effectively regulate plant biomass with an increase of 26.8 % in fresh weight and 30 % in dry weight.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Fanjia Sun,Yanhui Wang,Hongwei Gao,Xueqing Tian,Rui Zhu,Youbin Zheng,Jianbing Zang,Liang Dong
To address the challenges of the chlorine evolution reaction (CER) and catalyst corrosion in seawater electrolysis, this study developed a chromium-doped nickel-iron layered double hydroxide catalyst. This catalyst operates continuously for 100 h in alkaline seawater, showing consistent increases in activity. Chromium (Cr) doping strengthens the metal-oxygen (M-O) bond, inhibits the loss of lattice oxygen, and facilitates a shift toward the adsorbate evolution mechanism in the reaction pathway. Additionally, CrO 4 2- , produced by the in-situ oxidation and dissolution of Cr 3+ , establishes a dynamic “oxidation-dissolution-adsorption” equilibrium at the interface. This significantly reduces chloride ion (Cl - ) adsorption, corrosion, and the energy barriers of reactions. The introduction of a methanol-assisted system further decreases the overpotential. An electrolyzer that incorporates this system with Pt/C achieves efficient hydrogen production at a current density of 100 mA cm −2 and a voltage of 1.45 V.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Jialong Wang,Jinmeng Xiang,Huihui Cao,Renze Chen,Xinyu Long,Changheng Chen,Jiwen Chang,Chongfeng Guo
Cr 3+ -activated phosphor has become the mainstream choice to obtain broadband near-infrared phosphor-converted light-emitting diodes (NIR pc-LED) for the applications of bio-imaging and component nondestructive detection. However, exploring efficient and stable Cr 3+ -activated NIR phosphors is still an important yet formidable challenge. Herein, a series of Na y K 3- y LiMg 4 (Si 2 O 5 ) 6 :Cr 3+ phosphors was synthesized, which exhibits a broadband emission spectrum spanning 650-1100 nm. Utilizing the innovative non-main lattice substitution strategy, the internal quantum efficiency (IQE) of Cr 3+ was enhanced from 21% to 80%, and thermal stability was also improved from 42% to 70%@150 °C. Based on the first-principles theory calculation, the IQE and thermal stability improvement are attributed to the strengthened local structure stability around Cr 3+ caused by the introducing of Na + . Finally, a NIR pc-LED device was packaged by combining the optimized Na 3 LiMg 4 (Si 2 O 5 ) 6 :4%Cr 3+ phosphor with blue LED chip, which demonstrates potential applications in biological imaging and night vision systems.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2026
·
IF 10.5
Xingyu Li,Jian Peng,Zihao Xu,Wanyuan Li,Biao Xu,Chunyu Li,Wubin Dai
Simultaneous realizations of high thermal stability and quantum efficiency (QE) in phosphors with near-infrared (NIR) photoluminescence (PL) and long-persistent PL (LPL) attributes are a daunting task. Herein, we have come up with a dual-site co-substitution scheme in Ca 3 Sc 2 Ge 3 O 12 : Cr 3+ /Ni 2+ to concurrently actualize high-quality NIR-I/II (L)PL via either equivalent or aliovalent co-substitution at indirect lattice A/C sites of [Y 3+ + Al 3+ ] or [Y 3+ + Si 4+ ] for [Ca 2+ + Ge 4+ ]. Both Cr 3+ and Ni 2+ are colonized at B site (Sc 3+ ) under weak crystal field environment and emitting continuous PL across NIR-I/II regions via energy transfer from Cr 3+ to Ni 2+ under blue-light excitation. Due to inequivalent replacement of Ni 2+ at Sc 3+ site and consequential production of defects, a charming NIR LPL is also gained. Further incorporation of [Y 3+ + Al 3+ ] unit begets densified robust framework with [Sc(Cr/Ni)O 6 ] octahedral distortion, elucidating the mechanism of improved properties in PL QE (76.23%) and stability (89.5%@423 K). While [Y 3+ + Si 4+ ] modulation in Ca 3 Sc 2 Ge 3 O 12 not only brings rigid structure but also suppresses defects (LPL) because of equivalent triple-unit between Y 3+ /Si 4+ /Ni 2+ and Ca 2+ /Ge 4+ /Sc 3+ . A NIR pc-LED based on the designed phosphor with a commercial 460 nm blue LED chip is fabricated and reveals multi-applications in nondestructive detection, bioimaging, and anticounterfeiting. This work provides new perspectives for developing high-performance NIR-emitting phosphor materials. This study reveals the state-of-the-art researches on both NIR-I/II-emitting (L)PL phosphors with high QE and thermal stability from Cr/Ni-activated in garnet Ca 3 Sc 2 Ge 3 O 12 and their multiple applications in the NIR pc-LED, non-destructive detection, and anticounterfeiting. The proposed A/C-site regulation and ET from Cr to Ni pave a new way to design NIR-I/II phosphor and expands their related optoelectronic applications. Download: Download high-res image (298KB) Download: Download full-size image
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Sihan Yang,Changshuai Gong,Ziying Wang,Liang Dong,Xuejiao Wang,Ji-Guang Li
To overcome the problem of severe thermal quenching (TQ) of near-infrared (NIR) phosphors, the NIR phosphor with antithermal quenching performance is urgently needed. In this work, a negative thermal expansion (NTE) material Yb2–2xCr2xW3O12 was prepared. Through a comprehensive analysis involving in situ X-ray diffractometer (XRD), thermogravimetry (TG), and Rietveld refinement, it was concluded that, at room temperature, the sample adopts a trihydrate orthorhombic structure (Yb2W3O12·3H2O) and does not exhibit negative thermal expansion (NTE) behavior. However, after dehydration at 373 K, anhydrous orthorhombic Yb2W3O12 (space group Pbcn), which exhibits obvious NTE properties, was obtained. The underlying mechanism is that when water molecules enter the crystal and occupy vacancies, the Yb–O–W bonds bend, restricting the transverse thermal vibrations of the Yb–O–W bonds. The characteristic emission of Yb3+ within the range of 800–1300 nm was observed under 468 nm blue light irradiation due to the efficient energy transfer from Cr3+ → Yb3+. Remarkably, the prepared NIR phosphor has antithermal quenching performance, and at 398 K, the intensity of the strongest emission can maintain 1.89 times that of the room temperature, surpassing most NIR phosphors. The antithermal quenching phenomenon is attributed to cell contraction, which reduces the distance between the sensitizer and activator, thereby enhancing the energy transfer efficiency and increasing the luminous intensity. The combination of 460 nm excitable strong NIR emission and antithermal quenching suggests potential application in biomedical imaging and infrared night vision technologies. The NIR pc-LED device, prepared by coating the Yb1.94Cr0.06W3O12 phosphor on a commercial 460 nm chip, demonstrated a high optoelectronic efficiency and high output power, making it well-suited for night vision applications. Furthermore, the efficient NIR-I/II emission from Yb1.94Cr0.06W3O12 was proved to be highly effective for compositional analysis. This study offers valuable insights for designing NIR phosphors with excellent thermal quenching resistance.
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PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·Vol. 27
·期 45
·24273-24283
·
IF 2.9
Jin Zou,Daoyun Zhu,Zhongfei Mu,Song Xu,Nurahmat Wali,Fugen Wu,Huafeng Dong,Xin Zhang,Xiao Wu,Yifei Luo,Yuchun Zhan
Near-infrared (NIR) spectroscopic technology has shown extensive application prospects. However, developing NIR phosphors with tunability and high thermal stability is a huge challenge. In this work, a highly promising phosphate compound, K3Ga2(PO4)3, has been successfully synthesized. When doped with Cr3+ ions, it is particularly noteworthy that Cr3+ exhibits highly efficient and thermally stable broadband NIR luminescence in the tetrahedral coordination environment. This unique property makes K3Ga2(PO4)3:Cr3+ a compelling candidate for advanced photonic applications. Therefore, studying the luminescent properties of Cr3+ rare earth ions doped into tetrahedral sites is of great significance. In the tetrahedral coordination environment of K3Ga2(PO4)3:Cr3+ ions exhibit broadband near-infrared emission spanning from 700 to 1100 nm (λem = 822 nm, FWHM = 124 nm) under 452 nm blue light excitation. Remarkably, the quantum efficiency reaches as high as 70.9%, demonstrating its exceptional potential for advanced photonic applications. In addition, the phosphors demonstrated exceptional thermal stability with near-zero thermal quenching. The NIR luminescence intensity at 373 K and 423 K retained 109.0% and 90.4% of its initial room-temperature value, respectively. This remarkable performance can be attributed to the material's ultra-wide band gap, and minimal electron–phonon coupling. The NIR pc-LED devices, fabricated by integrating the optimized K3Ga1.93(PO4)3:0.07Cr3+ phosphors with a blue LED chip (λex = 455 nm), achieved a near-infrared output power of 274 mW with a conversion efficiency of 5.42% under a driving current of 100 mA. Experimental results demonstrate that the fabricated NIR pc-LED exhibits significant potential for applications in night vision and vein imaging technologies. This study provides a strategic framework for designing high-performance NIR pc-LED devices, utilizing K3Ga2(PO4)3:Cr3+ as an efficient phosphor-converted light source, and offers valuable insights for practical implementation in advanced optical systems.
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Laser & Photonics Reviews
·
2023
·
IF 11
Chunli Zhao,Yuan Gao,Jing Wang,Jianbei Qiu
Lead-free rare-earth-based perovskites have received widespread attention for their unique optical properties, although achieving efficient broadband near-infrared (NIR) emission with these materials remains a challenge. Here the synthesis of a rare earth-based double perovskite (Cs 2 NaScCl 6 ) by an improved solid phase method is reported. The doping of Cr 3+ led to the formation of [CrCl 6 ] 3− octahedron, which exhibited a broadband NIR emission peaked at 950 nm and a half-peak width of 162 nm. It is worth noting that with the same actual Cr 3+ content, the luminous intensity of Cs 2 NaScCl 6 synthesized by the improved solid-phase synthesis is four times higher than the product synthesized by the hydrothermal method. an efficient Cl − -Cr 3+ charge transfer sensitization facilitated by localized electrons in [CrCl 6 ] 3− octahedron is the mechanism for the strong NIR emission of Cr 3+ is proposed. Calculations based on density functional theory and Bader charge analysis support the notion that electrons in [CrCl 6 ] 3− octahedrons are strongly localized in Cs 2 NaScCl 6 :Cr 3+ , which is conducive to the Cl − –Cr 3+ charge transfer process, resulting the internal quantum efficiency of 100% and external quantum yield as 42.3%. The highly efficient ultra-broadband NIR emission with excellent stability offers many opportunities for applications in the field of NIR night vision and bio-imaging.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Kezhen Zhang,Xiaoyong Tian,Peipei Xu,Yan Zhu,Shanyi Guang,Hongyao Xu
A novel rhodamine-based multi-ion fluorescent sensor, RGN, was designed and synthesized for the highly selective detection of mercury ions (Hg 2+ ) in ethanol and water systems, as well as trivalent cations (Fe 3+ , Al 3+ , and Cr 3+ ) in acetonitrile and water systems using a two-step Schiff base reaction method. Nuclear magnetic titration experiments and theoretical calculations demonstrated that the sensor achieved the detection of the aforementioned metal ions through the fluorescence turn-on phenomenon induced by lactam ring-opening. Density functional theory (DFT) calculation results showed decreased HOMO-LUMO energy gaps and increased dipole moments, indicating the effective coordination of the sensor with the corresponding metal ions to form more stable complexes, thereby achieving detection objectives. Furthermore, the fluorescence turn-on sensor RGN exhibited relatively low detection limits, with limits of detection (LOD) for Fe 3+ , Al 3+ , Cr 3+ , and Hg 2+ being 10.20 nM, 14.66 nM, 58.78 nM, and 73.33 nM, respectively. Finally, practical applications of sensor RGN in environmental water samples, L929 cells, and zebrafish were demonstrated, indicating its potential for detecting and tracking Fe 3+ , Al 3+ , Cr 3+ , and Hg 2+ in environmental samples and biological systems, with prospects for biomedical applications in the diagnosis and treatment of heavy metal ion-induced diseases.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Mingyi Guan,Hui Li,Man Tu,Chenchen Fu,Xiyu Yang,Feng Wang
Trivalent chromium (Cr 3+ ) causes serious environmental pollution, degradation of the quality of edible agricultural products and human diseases. A novel phenanthro[9,10-d]imidazole-derived conjugated polymers (PIPF) was obtained from 4-(5,10-dibromo-1H-phenanthro[9,10-d]imidazol-2-yl)phenol and diethyl 4,4′-(2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-fluorene-9,9-diyl)dibutyrate by Suzuki polymerization reaction, which was reasonably demonstrated by 1 H NMR spectroscopy, infrared spectroscopy and quantum chemical calculations. The PIPF exhibits a “turn-on” fluorescence response to Cr 3+ in DMSO/H 2 O (98:2, v/v) with naked-eye detection. The limit of detection for Cr 3+ was calculated to be 0.073 μM with a linear range of 3–9 μM. The possible mechanism of the PIPF-based Cr 3+ fluorescence “turn-on” sensor is due to the inhibition of the PET process by the coordination of Cr 3+ to the hexaalkyl ester carbon chain of PIPF (RCOO-). The high sensitivity, good selectivity, and utility of this sensor indicated that PIPF-based “turn-on” fluorescence sensor is a potential fluorescence application for measuring Cr 3+ in environmental samples.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hengjuan Deng,Xinxin Han,Xinyi Wang,Dongxi Liu,Sheng Cao,Bingsuo Zou
Multifunctional luminescent materials emiting dual white and near-infrared (NIR) radiation have broad applications in various fields, including illumination, food detection and bio-imaging. Herein, an ultra-wide spectrum ranging from 330 to 1000 nm is achieved simply by co-doping Bi 3+ and Cr 3+ into the double perovskite K 2 LiGaF 6 , enabling simultaneous emission of white and NIR light. The emission bands peaking at 475 and 750 nm correspond to the radiative transitions of Bi 3+ and Cr 3+ , respectively. Systematically studies reveal that the NIR emission of Cr 3+ originates from efficient energy transfer from Bi 3+ , with energy transfer efficiency exceeding 80 %. The energy transfer mechanism is thoroughly explained. Moreover, the red partial emission of Cr 3+ in turn compensates the missing red component in the bluish emission of Bi 3+ , contributing to the final white emission. Notably, Bi 3+ ions occupy double lattice sites of Ga 3+ and Li + , which exhibit distinct luminescence properties. The luminescence behaviors of double Bi 3+ and Cr 3+ centers at various temperatures are systematically analyzed. Finally, the combination of the as-prepared dual-emissive K 2 LiGaF 6 :Bi 3+ ,Cr 3+ phosphor and a UV chip demonstrates potential applications in illumination, food detection and bio-imaging. This work provides new perspectives for the design of multifunctional luminescent materials and their deployment in diverse application scenarios.
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