ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Kechen Zhang,Haojing Xu,Yuhe Shao,Zaisheng Wen,Ting Wang,Mingyue Chen,Zhen Song,Quanlin Liu
Achieving excitation-free, long-range target surveillance under complete darkness remains a critical challenge for night-vision technology. Here, a breakthrough is reported in near-infrared (NIR) persistent luminescence (PersL) materials designed specifically for this frontier. Through strategic bandgap engineering via Sm 3 ⁺ co-doping and In 3 ⁺ solid-solution incorporation in the novel Cr 3 ⁺-doped Mg 3 Ga 1.9 In 0.1 SnO 8 spinel phosphor, the afterglow intensity and duration are dramatically enhanced. The optimized material exhibits an ultra-long NIR PersL exceeding 168 h. Crucially, PDMS films embedded with this phosphor enabled real-time, persistent target detection at an unprecedented distance of 47.5 m in complete darkness, entirely without any external excitation source. This record-setting long-range performance demonstrates the material's potential as an enabling technology for passive, long-range nighttime surveillance systems. Comprehensive spectroscopic studies elucidate the underlying PersL mechanism. This work establishes a new pathway for designing ultra-long NIR PersL materials and paves the way for advanced applications in remote night-vision technologies.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xuesong Wang,Yao Xiao,Puxian Xiong,Pan Zheng,Shengbing Xu,Wenzhao He,Haiqiang Fang,Pengzhe Wang,Jiayi Yu,Sheng Wu,Qi Qian
Mechanoluminescence (ML) materials can directly convert mechanical energy into light energy, demonstrating significant application potential in various fields. However, the limited spectral range of ML materials has hindered the application in complex environments such as biological stress detection and water quality monitoring. Here, we reported the Cr 3+ -activated high-perfromance NIR ML with continuous spectral tuning from a sharp R line (698 nm) to a broadband range (650–1000 nm) based on local crystal field engineering. Comprehensive characterizations (Raman, TEM, XPS and EPR) revealed the potential origin of ML, addressing synergistic effects of Cr 3+ -induced lattice distortion and oxygen vacancy defects. Lattice distortion breaks the central symmetry to induce the piezoelectric effect, driving carrier migration to Cr 3+ ion, in which oxygen vacancy provides a fast channel for carrier migration. Based on continuous NIR-ML spectral tunability, a novel water quality monitoring technology is demonstrated. The narrow band emission is used to detect sulfonated phthalocyanine cobalt, while broadband emission is used to detect carbon black. This work provides novel insights into the design of spectrally tunable NIR-ML materials and their application in real-time monitoring of water quality.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Ziyang Wu,Changheng Chen,Jinmeng Xiang,Jiwen Chang,Xiaoqi Zhao,Chongfeng Guo
The portable near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) with a broad spectrum have great application potential in information encryption, infrared night vision, medical imaging, chemical component detection, nondestructive testing, and many other fields, in which stable and efficient ultrawide NIR-emitting phosphors have become a new pursuit. However, the low luminescence intensity and narrowband emission of most NIR phosphors limit their potential applications. Under this drive, a NIR-emitting phosphor, Li2MgTi2.99O8:0.01Cr3+ (LMT:0.01Cr3+), with TiO6 and MgO6 octahedral sites for Cr3+, was developed. It exhibits 79.28% internal quantum efficiency (IQE) and a 155 nm full width at half maximum (fwhm) in the range of 600∼1300 nm. Based on the weakened crystal field strength through the [In3+-In3+] unit to cosubstitute the [Ti4+-Mg2+] unit, the emission peak red-shifted from 751 to 772 nm, with the fwhm widening to 205 nm in Li2Mg0.98In0.04Ti2.97O8:0.01Cr3+phosphors (LMIT:0.01Cr3+). The IQE was also further enhanced to 85.02% by substituting Mg2+ in LMIT:0.01Cr3+ with Zn2+, increasing the index of lattice distortion at the luminescence center to get Li2Mg0.92In0.04Zn0.06Ti2.97O8:0.01Cr3+ (LMIZT:0.01Cr3+). NIR pc-LED devices were fabricated by combining LMIZT:0.01Cr3+ phosphor with a blue LED chip, and their potential applications were also evaluated, showing excellent prospects in NIR penetration imaging and information encryption.
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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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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
·
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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Materials Today Chemistry
·
2024
·
IF 6.7
Chengliang Lyu,Dashuai Sun,Zeyu Lyu,Sida Shen,Pengcheng Luo,Zhihang Yue,Zheng Lu,Luhui Zhou,Hongpeng You
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) light sources have great potential for applications in information encryption , night vision, and non-destructive testing. However, designing efficient NIR phosphors with wide emission band remains a significant challenge. Here, we report a garnet-type NIR phosphor Gd 2 Mg 3 Ge 3 O 12 :Cr 3+ ,Yb 3+ (GMG:Cr 3+ ,Yb 3+ ). The GMG:0.06Cr 3+ phosphor shows a broadband emission peaking at 828 nm under 450 nm excitation, with a full width at half maximum (FWHM) of 188 nm. When Yb 3+ ions are introduced to construct Cr 3+ -Yb 3+ energy transfer, the obtained GMG:Cr 3+ ,Yb 3+ phosphor displays further widened emission band with a FWHM of 272 nm. Moreover, GMG:Cr 3+ ,Yb 3+ phosphor and commercial blue LED chips are combined to create NIR pc-LEDs, which have a photoelectric efficiency of 5.76% @ 100 mA and a maximum NIR output power of 17.21 mW @ 100 mA, demonstrating its potential applications in night vision, non-destructive testing, and information encryption.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12892-12898
·
IF 4
Chaojie Li,Małgorzata Sójka,Jiyou Zhong,Jakoah Brgoch
Rapid, non-destructive food-quality analysis using near-infrared (NIR) photoluminescence spectroscopy produced by phosphor-converted light-emitting diodes (pc-LEDs) has fascinating prospects for future food-safety monitoring. However, covering the energy window for organic molecular vibrations of interest in these applications requires NIR-emitting phosphors that are highly energy-efficient with ultra-broadband photoluminescence. This remains a materials design challenge. Here, a Cr3+-substituted garnet phosphor, Mg3Gd2Ge3O12, is found to possess a desired broadband NIR emission (λem = 815 nm, fwhm = 172 nm; 2513 cm−1) covering from 700 nm to 1200 nm with a photoluminescence quantum yield of 60.8% and absorption efficiency of 44.1% (λex = 450 nm). Fabricating a prototype NIR pc-LED device using the title material combined with a 455 nm emitting InGaN LED chip produces a NIR output power of 23.2 mW with photoelectric efficiency of 8.45% under a 100 mA driving current. This NIR light source is then used to demonstrate the quantitative detection of ethanol in solution. These results highlight the feasibility of this material for NIR spectroscopy and validate the prospects of using NIR pc-LEDs in food-quality analysis.
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Materials
·
2024
·Vol. 17
·期 9
·1946
·
IF 3.1
Jing Bao,Yongjun Feng,Yong Pan,Juncheng Jiang
In this paper, two flower-like magnesium silicate nanomaterials were prepared. These and another two commercial magnesium silicate materials were characterized using a scanning electron microscope, the N2adsorption–desorption method, and other methods. The structure–activity relationship between the adsorption performance of these four magnesium silicate materials and their specific surface area, pore size distribution, and pore structure was compared. The results showed that the 3-FMS modified by sodium dodecyl sulfonate (SDS) had the largest specific surface area and pore size, the best adsorption performance, and the largest experimental equilibrium adsorption capacity (qe,exp) for Co2+, reaching 190.01 mg/g, and Cr3+, reaching 208.89 mg/g. The adsorption behavior of the four materials for Co2+and Cr3+both fitted the pseudo-second-order kinetic model and Langmuir adsorption model, indicating that chemical monolayer uniform adsorption was the dominant adsorption process. Among them, the theoretical adsorption capacity (qm) of 3-FMS was the highest, reaching 207.62 mg/g for Co2+and 230.85 mg/g for Cr3+. Through further research, it was found that the four materials mainly removed Co2+and Cr3+through electrostatic adsorption, surface metal ions (Mg2+), and acidic groups (-OH and -SO3H) exchanging with ions in solution. The adsorption performance of two self-made flower-like magnesium silicate materials for Co2+and Cr3+was superior to that of two commercial magnesium silicates.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xinyu Fu,Huwei Li,Hongxia Yue,Zheyu Li,Jing Feng,Hongjie Zhang
Near-infrared (NIR) light-emitting diodes (LEDs) are potential devices that could become the core components in biological imaging, security monitoring, etc., which are currently constrained by suboptimal luminous efficiency due to the absence of excellent luminescent materials. Here, we report a double perovskite Cs2NaInCl6 that is suitable for Cr3+ doping and exhibits broad NIR emission. Through direct absorption and energy transfer (ET) from the self-trapped excitons (STEs) induced in the Cs2NaInCl6 matrix, Cr3+ can be excited to 4T1(P), 4T1(F), and 4T2(F) levels. Then, the broad emission with a full width at half-maximum (FWHM) of ∼150 nm, spanning 800 to 1300 nm, and a high photoluminescence quantum yield (PLQY) of up to 70% can be realized, resulting from the 4T2→4A2 transition of Cr3+. Subsequently, the introduction of Yb3+ endows Cs2NaInCl6:Cr3+,Yb3+ with a higher PLQY of 76% at the optimal doping ratio than Cs2NaInCl6:Cr3+. Ultimately, a miniaturized NIR LED device packaged based on Cs2NaInCl6:15%Cr3+,15%Yb3+ has been fabricated, which demonstrates superior performance for night vision, traceless perspective detection, and biological imaging. This work not only screens out a suitable Cs2NaInCl6 matrix for Cr3+ doping with high PLQY but also promotes its luminescence performance through Yb3+ doping for NIR LED applications.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 17
·24164-24170
·
IF 5.6
Rong-Rong He,Qiang-Qiang Zhu,Gan-Yu Cai,Ze-Tao Shen,Yue Zhai,Yu-Bin Kang,Le Wang
LED-based near-infrared (NIR) light sources are of considerable interest for advanced NIR spectroscopy technologies. However, LED "efficiency droop" presents a major challenge to achieving high-brightness NIR light. In this study, LaMgGa 11 O 19 :Cr 3+ (LMG:Cr 3+ ) ceramic was developed as a NIR color converter to achieve high-brightness laser-driven NIR light. The effects of fabrication temperature and Cr 3+ doping concentration on the luminescent properties of LMG:Cr 3+ ceramics were thoroughly investigated. Under blue light excitation, LMG:Cr 3+ ceramic exhibits a broadband NIR emission peak at 730 nm, with a high external quantum efficiency of 55.4 %. Due to its excellent heat dissipation performance and high-temperature stability, LMG:Cr 3+ ceramic can generate high-brightness NIR light, achieving an output power of 1.2 W when excited by a blue laser with power density of 7.50 W mm −2 . Finally, a laser-driven NIR light source has been successfully packaged, demonstrating the capability to meet various intelligent spectroscopy applications in biomedical imaging and non-destructive detection.
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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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