CERAMICS INTERNATIONAL
·
2022
·Vol. 49
·期 4
·6246-6253
·
IF 5.532
Jingxin Li,WenYan Zhang,XueFang Wang,RunQiu Peng,BingKai Gao,Qian Wu,Zicai Zhang,Zhijun Wang
In recent years, the broadband near-infrared (NIR) spectroscopy technology has been widely used in the field of nondestructive testing . However, these existing NIR phosphors showed relatively short emission wavelengths , narrower half-maximum full-width (FWHM), and narrower half-peak widths, importantly, few phosphors presented the emission from 950 nm to 1100 nm. In order to solve these problems, the Yb 3+ /Cr 3+ ions codoped La(Mg 0.5 Sn 0.5 In 0.5 Sc 0.5 ) 0.5 O 3 (LMSIS) was synthesized by the solid-state method, and the emission spectrum of LMSIS:Cr 3+ can be extended to the NIR long-wave region due to the energy transfer of Yb 3+ and Cr 3+ , and the thermal stability of the phosphor can be improved due to the inherent temperature stability of the Yb 3+ f-f transition. The NIR phosphor converted light emitting diodes (pc-LEDs) were fabricated by combining the LMSIS:0.003Cr 3+ , 0.0015Yb 3+ with blue LED chip, which can be expected to be used in the field of broadband near-infrared non-destructive detection.
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高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 18
·9382-9391
·
IF 5.1
Zaidong Chen,Yuefei Xiang,Xinghui Qin,Lei Zhong,Hong Liao,Shiwen Liu,Jiaqi Wang,Kezhi Zheng,Dejian Hou,Lei Zhou,Mingmei Wu
The challenges of low blue light absorption, reduced luminous efficiency, and low thermal stability are critical issues confronting near-infrared II (NIR-II) phosphors, which significantly hinder their applications in food testing, medical imaging, and various other fields. Herein, an energy transfer strategy was adopted to enhance blue light absorption by introducing Cr3+ into Lu2CaMg2Si3O12:Ni2+, thereby enhancing their luminescence properties, including quantum efficiency and thermal stability. Given the superior energy transfer efficiency of Cr3+ → Ni2+, the quantum efficiency of Lu2CaMg2Si3O12:Cr3+,Ni2+ was increased from 23.0% to 32.6%, and the thermal stability improved by 18%, as compared to Lu2CaMg2Si3O12:Ni2+. Furthermore, the Dexter's model was employed to systematically analyze the energy transfer mechanism of transition metal ions. In addition, due to the difference in the temperature response of Cr3+ and Ni2+, the thermometry performance of this phosphor was studied. Importantly, a pioneering method for food components detection based on the convolutional neural network model was proposed, demonstrating a 100% detection success rate. This research not only propels the development of novel blue-light-excitable NIR-II phosphors but also contributes to the advancement of intelligent lighting technologies.
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高影响因子
Theranostics
·
2019
·
IF 8.063
Xu-Qi Kang,Gao-Feng Shu,Sai-Ping Jiang,Xiao-Lin Xu,Jing Qi,Fei-Yang Jin,Di Liu,Yong-Hong Xiao,Xiao-Yang Lu,Yong-Zhong Du
The prevalence of antibiotic resistance and lack of alternative drugs have posed an increasing threat to public health. Here, we prepared β-Ga 2 O 3 :Cr 3+ nanoparticles modified with ICAM1-antibody-conjugated TPGS (I-TPGS/Ga 2 O 3 ) as a novel antibiotic carrier for the treatment of drug-resistant infections. Methods : I-TPGS/Ga 2 O 3 were firstly characterized by measuring particle size, morphology, crystal structure, drug loading capacity, and in vitro drug release behaviors. The in vitro antibacterial activities of I-TPGS/Ga 2 O 3 /TIG were evaluated using standard and drug-resistant bacteria. The internalization of I-TPGS/Ga 2 O 3 was observed by fluorescence confocal imaging, and the expression levels of the efflux pump genes of TRKP were analyzed by real-time RT-PCR. In vitro cellular uptake and in vivo biodistribution study were performed to investigate the targeting specificity of I-TPGS/Ga 2 O 3 using HUEVC and acute pneumonia mice, respectively. The in vivo anti-infective efficacy and biosafety of I-TPGS/Ga 2 O 3 /TIG were finally evaluated using acute pneumonia mice. Results : It was found that TPGS could down-regulate the over-expression of the efflux pump genes, thus decreasing the efflux pump activity of bacteria. I-TPGS/Ga 2 O 3 with small particle size and uniform distribution facilitated their internalization in bacteria, and the TPGS modification resulted in a significant reduction in the efflux of loaded antibiotics. These properties rendered the encapsulated tigecycline to exert a stronger antibacterial activity both in vitro and in vivo . Additionally, targeted delivery of I-TPGS/Ga 2 O 3 mediated by ICAM1 antibodies contributed to a safe and effective therapy. Conclusion : It is of great value to apply I-TPGS/Ga 2 O 3 as a novel and effective antibiotic delivery system for the treatment of drug-resistant infections.
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Qinghong Meng,Jiaming Yuan,Wanjun Yu,Xiangming Li,Yaping Wang,Zhijun Xu,Ji-Guang Li
To meet the diverse requirements of the near-infrared (NIR) phosphor-converted light-emitting-diodes (NIR pc-LEDs) in various fields, high-performance broadband NIR-emitting phosphors are attracting growing interest. A novel garnet-type Gd 2 CaAl 3‒ y GaZrO 12 : y Cr 3+ (GCAGZ: y Cr) NIR phosphor with satisfactory luminescence efficiency and thermal stability was discovered in this work. The typical GCAGZ:0.04Cr phosphor exhibited highly efficient (IQE = 93.3 %, EQE = 20.0 %) broadband NIR emission with peaking at ∼748 nm (full-width at half-maximum ∼102 nm) and excellent thermal stability (88.3 %@423 K) under 450 nm light excitation, owing to the wide band gap of the garnet host, the relatively weak crystal field environment, and the exceedingly weak electron-phonon coupling effect. The NIR pc-LED device constructed by coating this GCAGZ:0.04Cr phosphor on a 450 nm blue LED chip presented outstanding NIR output power (∼44.8 mW) and photoelectric conversion efficiency (19.8 %) under a driving current of 100 mA, showing that this phosphor has huge potential utilized in the construction of NIR pc-LED applied in plant growth lighting, night vision, and non-invasive medical diagnosis.
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高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Bo Gao,Xiao Zang,Xiuhui Yin,Baolei Qi,Jiahao Li,Zewen Dong,Xufeng Zhou,Wei Li,Yangbo Wang,Huaiyong Li
Broadband near-infrared (NIR) phosphors emitting in the 700–1000 nm range find extensive applications in night vision, medical image, and food analysis. High luminescence thermal stability of their spectra is crucial for maintaining consistent and reliable output under various thermal conditions. Microcrystalline powders of Sr2Sc2B4O11:Cr3+ are synthesized, and their photoluminescence (PL) properties are studied as functions of Cr3+ concentration, temperature, and excitation power. The energy band structure and phonon density of states of the Sr2Sc2B4O11 lattice are studied theoretically. It is revealed that Sr2Sc2B4O11 is an indirect bandgap material with a bandgap of 3.16 eV. Sr2Sc2B4O11:Cr3+ shows broadband NIR emission centered at 825 nm upon 455 nm excitation with lifetimes on the order of 100 μs from 80 to 600 K. The PL shows good luminescence thermal stability with a quenching temperature of 380 K. Notably, 57% of the room-temperature PL intensity is retained at 423 K. The high luminescence thermal stability of the PL may be attributed to the constraint on the deformation of ScO6 polyhedra through the formation of dimers. A luminescence thermometer based on the lifetime of Sr2Sc2B4O11:Cr3+ is proposed. It is determined that the relative sensitivity of the thermometer increases gradually from 80 to 600 K and exceeds 0.5% K–1 starting from 300 K.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Xiangming Li,Jiaming Yuan,Qinghong Meng,Xuejiao Wang,Wanjun Yu,Zhijun Xu,Ji-Guang Li
To develop Cr 3+ -activated broadband near-infrared (NIR) phosphors emitting beyond 780 nm with a full-width at half-maximum (FWHM) > 150 nm for multifunctional applications, novel Y 3− x Ca x Ga 3 Al 2− x Si x O 12 : y Cr 3+ were developed by Ca 2+ /Si 4+ co-substitution in the Y 3 Ga 3 Al 2 O 12 garnet host. Both higher Ca 2+ /Si 4+ substitution and greater Cr 3+ incorporation weaken the crystal field strength, red-shift and broaden the Cr 3+ emission band, and shorten the fluorescence decay. Accordingly, the emission maximum and FWHM of this series can be effectively modulated over 708−827 nm and 78−208 nm, respectively. Further, the satisfactory luminescence (output power of 30.31 mW and photoelectric conversion efficiency of 10.75% at a 100 mA drive) and imaging performance of the as-fabricated device using the typical x = 1.5/ y = 0.03 sample demonstrated that this phosphor is a candidate material for the construction of pc-NIR-LED, which can be practically deployed in a range of scenarios, including night-vision imaging, food-quality inspection, and non-invasive bioimaging.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Biao Xu,Wanyuan Li,Chengyu Ni,Wubin Dai
Unlike static anticounterfeiting that is easily replicated, dynamic multimode photoluminescence (PL) technology has a brighter application prospect in anticounterfeiting/encryption. Yet, the majority of dynamic PL phosphors currently still rely solely on the optical storage mechanism, resulting in a scarcity of diversification, and can easily be decoded. Herein, a series of SrGa2Si2O8: Mn2+/Cr3+ (SGS: Mn/Cr), synthesized via a facile solid-state reaction, is designed to explore interrelationships among entangled changes in the host structure, crystallographic site occupancy, dynamic multimode PL, and multiapplications in anticounterfeiting, encryption, and optical thermometry, based on theoretical calculations and experimental analyses. Although pristine SGS only provides 7(Sr)- and 4(Ga, Si)-fold sites for dopants to occupy, highly efficient characteristic broadband red-NIR emission at ∼765 nm from Cr3+ in 6-fold crystallographic position is obtained as a result of fine-tuning of the local site from [GaO4] to [Ga(Cr)O6] and the close ionic radius in the same valence. Based on the spectral superposition of Mn2+ simultaneously from [Ga(Mn)O4], [Sr(Mn)O7], and Mn–Mn dimers, broadband PL in the green region with a summit of ∼530 nm is gained. The green- and red-NIR afterglows from Mn2+ and Cr3+ with wide and continuous multiple traps are also studied. Owing to the combined PL from the codoped SGS: Mn/Cr, which shows strong correlations with excitation wavelength, doping content, composition, temperature, and detecting time, dynamic multimode PL is realized under distinct test conditions, and the corresponding applications are achieved in the laboratory. This study gives new cogitations in structural adaptabilities for Cr-activated phosphors and their related actual applications.
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高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 19
·期 2
·2401248
·
IF 9.8
Zhan Xiong,Gaochao Liu,Weibin Chen,Zhiguo Xia
High-power broadband near-infrared (NIR) light sources have received extensive attention in long-distance night vision lighting, non-invasive detection and imaging, and quantitative analysis of organic components. However, developing targeted NIR-emitting phosphors with high external quantum efficiency (EQE) and thermal stability remains a challenge to raise the NIR output power and expand the applications. Herein, Ga 1.98− x Sc x O 3 :0.02Cr 3+ luminescent ceramics are prepared with redshifted emission peaks from 710 to 820 nm depending on the weakened crystal field. The optimized Ga 1.18 Sc 0.8 O 3 :0.02Cr 3+ ceramic exhibits a high EQE of 79.6% and excellent thermal stability ( I 423 K / I 298 K = 72%) under 468 nm excitation, which brings a saturation threshold up to 893 mW@3 W mm −2 under 450 nm laser pumping. The high-power laser-driven broadband NIR light source demonstrates potential in non-invasive detection and quantitative analysis of alcohol concentration. This study opens up new avenues for the exploration of high-power broadband NIR light sources.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 48
·17128-17135
·
IF 6.4
Shuofeng Sun,Yuming Yang,Renfei Zhang,Qinan Mao,Lang Pei,Junhua Xi,Yang Ding,Yiwen Zhu,Hua Yu,Jiasong Zhong
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) offer distinct advantages over traditional NIR light sources in the miniaturization of spectrometers. Nevertheless, the lack of highly efficient NIR phosphors with a large bandwidth hinders their practical applications. Herein, a novel Cr3+-doped (Ca1−xLix)(Mg1−xScx)Si2O6 phosphor with a broadened emission has been successfully developed by controlling the lattice disorder via [Li+–Sc3+] chemical unit substitution in CaMgSi2O6:Cr3+. Upon exciting the phosphor with 455 nm blue light, (Ca0.5Li0.5)(Mg0.5Sc0.5)Si2O6:4%Cr3+ exhibits notable NIR emission centered at approximately 847 nm, featuring a full width at half-maximum (FWHM) of 172 nm. The disordered occupation of Ca2+/Li+ and Mg2+/Sc3+ enhances the electron–phonon coupling effect, resulting in a broader emission of (Ca0.5Li0.5)(Mg0.5Sc0.5)Si2O6:Cr3+ compared with that of CaMgSi2O6:Cr3+. In order to further broaden the emission band, an energy transfer (ET) strategy is explored. By leveraging the ET process from Cr3+ to Yb3+, the FWHM of (Ca0.5Li0.5)(Mg0.5Sc0.5)Si2O6:4%Cr3+,0.4%Yb3+ is significantly increased up to 264 nm. The phosphor possesses a quantum yield of 46% and a thermal stability of 69% at 423 K. The NIR pc-LED utilizing the (Ca0.5Li0.5)(Mg0.5Sc0.5)Si2O6:Cr3+,Yb3+ phosphor yields an NIR optical power of 57.31 mW at a driving current of 300 mA, and achieves 10.01% photoelectric conversion efficiency at 25 mA, exhibiting promising potential for application in bio-imaging and food analysis.
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高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 44
·22186-22196
·
IF 5.1
Shuang Wu,Yongqi Zhu,Nan Zheng,Hui Liu,Yiwen Zhu,Xinyue Li,Yifan Chen,Daqin Chen
Near-infrared (NIR) luminescent materials are promising NIR light sources for multifunctional applications; providing a strategy to tailor the emission and enhance the performance of NIR phosphors is crucial. Herein, a green HF-free synthetic strategy is realized to tune the NIR emission advantageously by substituting on the adjacent octahedral, completely different from breaking the d–d parity forbidden transitions of Cr3+ through conventional lattice distortion. Broadband NIR phosphor K2Na1−xLixAlF6:Cr3+ with excellent thermal quenching resistance is prepared using the hydrothermal method. Controllable emission tuning from 726 to 765 nm and broadening full width at half-maximum from 105 to 130 nm, is achieved by substituting Li+ for Na+, resulting from weakening the crystal field and increasing electron–phonon coupling. Lithium ions play a critical role in suppressing nonradiative relaxation of the emission centers, thereby significantly enhancing the emission intensity of K2NaMF6:Cr3+ (M = Al, Ga, In) phosphors. The as-fabricated prototype NIR phosphor-converted light-emitting diode device, exhibits significant promise in the fields of night vision and information encryption. This study provides an effective design strategy for developing broadband NIR luminescent materials with high efficiency and good thermal stability.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Yichen Yang,Xiaojiao Kang,Qiwen Pan,Zhennan Zhu,Wei Lü
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are gaining significant interest due to their potential in spectroscopic applications. NIR phosphors play a critical role in pc-LED devices by converting visible light into NIR emission with high stability and tunability. In this study, an efficient broadband NIR phosphor, Ca 3 TiTaGa 3 O 12 :Cr 3+ , is developed and systematically investigated. Ca 3 TiTaGa 3 O 12 :Cr 3+ exhibits a broad NIR emission band centered at 790 nm with a full width at half maximum (FWHM) of 202 nm upon 450 nm blue light excitation. The emission bandwidth is further expanded to 303 nm by introducing an optimal amount of Yb 3+ co-doping, which produces a merged ultra-broadband Cr 3+ –Yb 3+ emission. Luminescence and decay kinetic analysis reveal that the resultant ultra-broadband emission originates from effective energy transfer Cr 3+ to Yb 3+ . Moreover, the Yb 3+ co-doping enhances the internal quantum efficiency from 30.5% to 41.3%, and improves thermal stability with emission retention increasing from 42.6% to 57.4% at 150 °C. The Ca 3 TiTaGa 3 O 12 :Cr 3+ and Ca 3 TiTaGa 3 O 12 :Cr 3+ , Yb 3+ phosphors are successfully integrated with a 450 nm blue LED chip, demonstrating their potential for practical NIR pc-LED device applications in night vision and bioimaging.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Ying Peng,Xinyi Tang,Yuhuan Tan,Dequan Liu,Pengyan Fu,Jilin Zhang,Shixun Lian,Wenli Zhou
Heterovalent Ca 2+ -Si 4+ co-substitution tunes local coordination of Cr 3+ . • Double NIR luminescence without altering Cr 3+ average crystal field. • Optimized phosphor achieves greatly improved absorption and quantum efficiency. • High-brightness pc-NIR-LED is fabricated for imaging and plant lighting. Cr 3+ -doped near-infrared (NIR) phosphors are highly desirable for NIR illumination, biological detection and auxiliary imaging. Herein, we propose a heterovalent Ca 2+ -Si 4+ co-substitution strategy to replace Ga 3+ sites in β -Ga 2 O 3 :Cr 3+ . This approach precisely tailors the local coordination and defect structures surrounding Cr 3+ , leading to remarkable enhancement in NIR luminescence. Characterizations demonstrate that Ca 2+ -Si 4+ co-substitution barely changes the average crystal field of Cr 3+ , but introduces local lattice distortion and reduces coordination symmetry. Such local structure engineering relaxes the d-d transition selection rules of Cr 3+ , thereby enhancing the absorption of the 4 A 2g → 4 T 1g and 4 T 2g transitions and strengthen the broadband NIR emission from the 4 T 2g → 4 A 2g transition. For the optimal Ga 1.81 Ca 0.08 Si 0.08 O 3 :0.03Cr 3+ phosphor, the NIR emission intensity is approximately two times higher relative to pristine β -Ga 2 O 3 :Cr 3+ . Its internal quantum efficiency increases from 81.8% to 88.6%, and absorption efficiency rises from 10.9% to 30.6%. A comparative study on various M A 2+ –M B 4+ ion pairs (M A = Mg, Ca, Sr, Ba; M B = Si, Ge, Sn) verifies that Ca 2+ -Si 4+ yields the strongest luminescence enhancement for β -Ga 2 O 3 :Cr 3+ . Moreover, this universal strategy also improves blue light absorption and NIR emission of MgGa 2 O 4 :Cr 3+ and LiGa 5 O 8 :Cr 3+ . The assembled phosphor-converted NIR light-emitting diode achieves a NIR output power of 107.9 mW at 400 mA and a photoelectric conversion efficiency of 14.8% at 40 mA. The as-prepared phosphors possess promising practical values for NIR imaging and plant lighting. Download: Download high-res image (288KB) Download: Download full-size image
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高影响因子
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