JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2026
·Vol. 103
·期 10
·103028
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IF 3.4
Yan Xu,Youjia Wang,Dongyan Bao,Jie Zhang,Mingjun Song
A new double-perovskite structured phosphor, Sr 2 MgWO 6 : xCr 3+ , yYb 3+ , with device potential has been successfully synthesized. • The phosphor exhibits emission performance covering the NIR-I to NIR-II regions, with a wavelength range exceeding 400 nm. • This phosphor exhibits excellent thermal stability, and the optical temperature-sensing performance was investigated using FIR. • The phosphor exhibits a Cr 3+ -Yb 3+ energy transfer efficiency (η ET ) exceeding 50%. Near-infrared (NIR) phosphors have shown great potential for applications in temperature sensing, night vision surveillance, agricultural illumination, and so on. In this study, a series of Sr 2 MgWO 6 (SMW): xCr 3+ , yYb 3+ phosphors were synthesized via a conventional high-temperature solid-state reaction method. Firstly, the effects of Mg 2+ content variation on the luminescent properties of Cr 3+ singly doped phosphors were systematically investigated. It was found that the quantum efficiency of the samples reached a maximum when the Mg 2+ content was 120% of the stoichiometric ratio, attributed to the optimization of local crystal field environment around Cr 3+ ions. On this basis, Cr 3+ -Yb 3+ co-doped phosphors were further optimized by introducing Yb 3+ ions, and the optimal composition was determined to be SMW: 0.5% Cr 3+ , 1.5% Yb 3+ . Under 360 nm excitation, the optimized phosphor exhibited intense NIR emission covering the wavelength range of 713-1137 nm. Benefiting from an exceptionally efficient Cr 3+ →Yb 3+ energy transfer (η ET = 50.18%) achieved at a low Yb 3+ concentration of only 3.0%, the optimized phosphor exhibits a significantly broadened emission bandwidth and enhanced NIR output intensity. Furthermore, the thermal stability of the optimal sample was evaluated by temperature-dependent emission spectra. The results revealed excellent luminescence stability of the phosphor at elevated temperatures. Notably, based on the fluorescence intensity ratio (FIR) between Cr 3+ and Yb 3+ emissions extracted from the variable-temperature spectra, a self-referencing optical temperature sensor was constructed. The absolute and relative sensitivities were calculated, demonstrating the feasibility of the developed phosphor for non-contact temperature sensing applications. Additionally, performance tests on pc-LEDs confirmed their excellent spectral stability, indicating the material's potential for practical applications in NIR pc-LEDs. This work provides a promising strategy for designing broadband NIR-emitting phosphors with dual functionalities of lighting and temperature sensing. Download: Download high-res image (255KB) Download: Download full-size image
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高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Qinan Mao,Xiaoqian Zhang,Zaixi Yin,Junhua Xi,Heyi Yang,Meijiao Liu,Jiasong Zhong
High-performance broadband near-infrared (NIR) phosphors are essential for the development of state-of-the-art NIR phosphor-converted light-emitting diodes (pc-LEDs). Herein, we report a novel Cr3+-doped Mg4GaSbO8 (MGSO) luminescent material based on an orthorhombic spinel-derived superstructure featuring multiple crystallographically distinct octahedral sites. By precisely modulating Cr3+ concentration, NIR emission with a remarkable tunability in full width at half-maximum from 100 to 308 nm is realized. Comprehensive spectroscopic analyses reveal three inequivalent Cr3+ emission centers (CrI, CrII, and CrIII) arising from selective substitution at Mg1, Mg2, and Mg3 octahedral sites with progressively weakened crystal fields. Increasing dopant concentration drives sequential site occupation and energy transfer among Cr3+ centers, leading to pronounced spectral redshift and ultrabroadband emission. The optimized MGSO:0.07Cr3+ shows a high quantum yield of 80.4% and solid thermal stability with 85.6% emission intensity retention at 373 K. At high doping levels (x = 0.20), the phosphor exhibits reduced thermal robustness but exceptional spectral broadening. Finally, MGSO:Cr3+ was integrated into NIR pc-LED prototypes, underscoring their potential applicability in nondestructive inspection and NIR spectroscopy.
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PubMed
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Zhennan Wang,Yi Wei,Zhiliang Ren,Wei Wang,Dong Tu,Guogang Li
Near-infrared (NIR) light serves a key role in many potential applications such as food analysis, biomedical devices, night vision, and so on. As an important component of NIR phosphor-converted light-emitting diodes (pc-LEDs), the adjustment of emission peak position and spectral width of Cr3+-doped phosphors is still considered to be a crucial challenge. Herein, the two emissions at 740 nm from [Cr1O6] and 830 nm from [Cr2O4] were realized to broaden the emission band in the Al2.26Ge0.74O4.87:Cr3+ (AGO:Cr3+) phosphor. Moreover, with increasing Cr3+-doped concentration, the crystal field strength decreases and energy transfer from [Cr1O6] to [Cr2O4] is enhanced. The emission peak originating from [Cr2O4] gradually becomes dominant, resulting in a spectral red shift and broadening. The optimized AGO:0.7% Cr3+ phosphor shows remarkable thermal stability, of which the integrated intensity at 373 K keeps 86% of the initial intensity at 298 K. Under 405 nm excitation, the internal quantum efficiency could reach 70% and the external quantum efficiency was measured to be 23%. The application of night vision can be implemented based on the AGO:Cr3+-fabricated NIR pc-LED. This work achieves simultaneous modulation of luminescence color and spectral width by controlling the Cr3+-doped concentration, which provides a feasible strategy for NIR emission adjustment.
研究领域:
材料科学
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光学材料
·
固态照明
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光子学
·
发光
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Zhengfa Dai,Xinyu Mao,Qiang Liu,Danyang Zhu,Haohong Chen,Tengfei Xie,Jian Xu,Dariusz Hreniak,Martin Nikl,Jiang Li
ZnGa 2 O 4 (ZGO) persistent luminescence (PersL) ceramics doped with different concentrations of Cr 3+ were prepared by the co-precipitation method and hot isostatic pressing (HIP) post-treatment. After HIP post-treatment, the ZGO PersL ceramics was significantly improved from opaque to transparent visual appearance due to the elimination of micro-pores during HIP process. The effects of Cr 3+ concentration on the morphology, transmittance and PersL properties of ZGO PersL ceramics were systematically investigated. The ZGO PersL ceramics with higher Cr 3+ dopant concentrations show less micro-pores and higher transmittance, which indicates that the Cr 3+ can also work as a sintering additive to increase the density and to improve the optical quality of ZGO PersL ceramics. The photoluminescence excitation (PLE) and emission (PL) intensities increase with the increase of Cr 3+ concentration up to 0.25 at.%. At yet higher Cr 3+ concentrations, the ZGO PersL ceramics exhibits weaker PL and PLE intensities which is probably caused by the concentration quenching effect. However, the PersL decay curves show that the PersL performance of ZGO ceramics increases with increasing Cr 3+ concentrations, indicating that the doping by Cr 3+ ions may cause another traps formation leading to stronger and longer PersL. The PersL decay curves of all ZGO PersL ceramics were fitted by the second-order exponential function, indicating that at least two kinds of traps with different electron release rates exist in the ZGO ceramics. The influence of Cr 3+ concentration on the thermoluminescence (TL) of ZGO PersL ceramics was also studied, and the results showed that the TL curves of the pre-sintered ceramics shifted to lower temperatures, indicating that the depth of trap related to Cr 3+ ions is shallower than the depth of trap caused by the intrinsic defects.
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Journal of Energy Storage
·
2022
·
IF 8.907
Hongmei Xie,Juguo Dai,Lili Luo,Long Xia,Xiaohong Wang,Chunying Yang,Yiting Xu,Birong Zeng,Lizong Dai
Energy and environmental issues have been hot topics over the past few decades. As new energy storage conversion equipment, supercapacitor has been hindering due to their low energy density . Constructing asymmetric supercapacitors to boost energy density is considered as an effective approach. In this study, functional modification was combined with in-situ polymerization to prepare the reduced graphene oxide/polyaniline/terpyridine (RGPT) composites to capture metal ions and serve as cathode material of supercapacitor. When Cr 3+ ions are complexed with composite material, the electrochemical property of the resulting material is greatly improved. The RGPT-Cr composites display a high specific capacitance of 1499 F g −1 at 1 A g −1 with outstanding cycling stability in three-electrode systems. Asymmetric supercapacitor (ASC) devices assembled with the RGPT-Cr composites as positive electrodes present a superior energy density up to 117.5 Wh kg −1 at a power density of 915.0 W kg −1 and possess preeminent capacitance retention of 93.2% after 6000 cycles at 20 A g −1 . In addition, the theoretical calculations prove that Cr 3+ helps to enhance the surface-capacitive contribution of whole composites. This strategy has validated the fact that the incorporation of metal coordination bonds boosts the electron transfer efficiency and structural stability of the whole composite.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 2
·966-976
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IF 3.784
Hongyu Lv,Zhichao Liu,Chao Wang,Yiyu Cai,Hao Zhang,Ting Wang,Xiuxia Yang,Xue Yu,Jianbei Qiu,Xuhui Xu
The exploration of the high thermal stability near-infrared (NIR) phosphors is significantly crucial for the development of plant lighting. However, NIR phosphors suffer from the poor chemical and thermal stability, which severely limits their long-term operation. Here, the successful improvement of luminous intensity (149.5%) and thermal stability at 423 K of Zn 3 Ga 2 GeO 8 (ZGGO): Cr 3+ phosphors is achieved for the introduction of Al 3+ ions into the host. The release of carriers in deep traps inhibits the emission loss for the thermal disturbance. Furthermore, an NIR light emitting diodes (LEDs) lamp is explored by combining the optimized Zn 3 Ga 1.1675 Al 0.8 GeO 8 : 0.0325Cr 3+ phosphors with a commercial 460 nm blue chip, and the emission band can match well with the absorption bands of photosynthetic pigments and the phytochrome (P R and P FR ) of plants. The explored LEDs lamp further determines the growth and the pheromone content of the involved plants for the participation of the NIR emission originated from Cr 3+ ions. Our work provides a promising NIR lamp as plant light with improved thermal stability for long-term operation.
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Fundamental Research
·
2021
·
IF 0
Yaru Zhang,Lina Zhao,Aibing Chen,Jie Sun
Rechargeable aqueous zinc-ion batteries (ZIBs) are regarded as the next promising large scale energy storage systems owing to their low cost, high safety and environmental friendliness. Vanadium-based materials are one of the most important cathodes of ZIBs due to their high abundance and multielectron transfer of various oxidations of vanadium. Nevertheless, the strong electrostatic interaction between Zn 2+ and cathodes, intrinsic poor electronic conductivity and solubility of vanadium-based cathodes in electrolytes bring about inferior electrochemical performance. In this work, we introduce aliovalent Cr 3+ into the interlayer of hydrated vanadium oxide (Cr-VOH) as pillar to significantly increase the structural stability and electrochemical reversibility. The pre-intercalation of Cr 3+ also provides an enhanced electronic conductivity and fast Zn 2+ diffusion dynamics, enabling superior Zn 2+ storage performance of the Cr-VOH cathode. As a result, the Cr-VOH cathode exhibits a high reversible discharge capacity of ~380 mAh g −1 at 50 mA g −1 , excellent rate capacity of 166 mAh g −1 at 8 A g −1 and prolonged cycling stability over 500 cycles. Furthermore, it displays a high energy density of 273.6 W h kg −1 at 0.05 A g −1 and the power density of 4960 W kg −1 at 8 A g −1 , contributing to the practical application potential of aqueous ZIBs.
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RSC Advances
·
2023
·Vol. 13
·期 41
·28550-28559
·
IF 3.9
Xiaohua Xu,Huye Li,Yapeng Sun,Tianfeng Ma,Lin Shi,Wencheng Mu,Huan Wang,Yongchang Lu
Cr3+ is one of the most essential trace elements in living organisms and plays a vital role in human metabolism. However, both deficiency and excess intake of Cr3+ can be harmful to the human body. Therefore, the quantitative determination of Cr3+ is of great significance in the field of life science. Based on this, in this study, a g-CNQDs@p-acetaminophenol fluorescence sensing system was developed for the quantitative detection of Cr3+ in actual complex samples. G-CNQDs were synthesized with sodium citrate and urea as precursors. The fluorescence signal was enhanced by the synergistic effect between p-acetaminophenol (APAP) and g-CNQDs. The fluorescence quenching phenomenon can be produced when Cr3+ is introduced into the fluorescence-enhanced g-CNQDs@p-acetaminophenol system. An “on–off” fluorescence sensing system was constructed based on g-CNQDs@p-acetaminophenol for the quantitative detection of Cr3+. The experimental data showed a wide linear region in the concentration range of 0.64–63.0 μM, and the detection limit was as low as 0.23 μM. The construction of the sensor system broadens the research field for the practical application of Cr3+.
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高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiao Qu,Binquan Zhao,Qi Zhu
In the field of information encryption, multi-mode luminescent materials that can emit light in response to different forms of excitation are very important. Here, ZnAl 2 O 4 : x Ti 4+ ( x = 0, 0.25%, 0.5%, 0.75%, 1%, 1.25%) and ZnAl 2 O 4 :1%Ti 4+ , y Cr 3+ ( y = 0.1%, 0.2%, 0.3%) optical materials were synthesized by solid-state reaction method. The crystal structure does not significantly change after doping Ti 4+ and Cr 3+ . The single-doped Ti 4+ samples output blue light at 440 nm. Further doping Cr 3+ with y = 0.1%, 0.2% and 0.3%, the emission color shifts from blue to red under 254 nm excitation. There is energy transfer of Ti 4+ →Cr 3+ , and the largest efficiency is 54.0% at y = 0.3%. Because the thermal stabilities of emissions for Ti 4+ and Cr 3+ are quite different, the emissions at 440 nm (Ti 4+ ) and 700 nm (Cr 3+ ) exhibit significantly different responses to temperature. Furthermore, varying the excitation lights from 254 nm to 365 nm also yields different light outputs. Finally, three typical samples were designed for letters “CHN”. The “CHN” logo outputted lights of different colors at different temperatures, and the optical signals varied under different excitations. The colorful emission with different modes can be coded to achieve the application of multi-mode anti-counterfeiting, indicating that they have broad application prospects in this area.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tao Yang,Lingxiang Chu,Ting Zhang,Qiang Zhou,Yi Qin,Zhengliang Wang,Jing Wan,Mingmei Wu
The exploration of Cr 3+ -doped near-infrared (NIR) phosphors for light-emitting diodes has attracted widespread attention. In this work, we present a fluoride double perovskite K 2 LiScF 6 :Cr 3+ NIR-emitting phosphor through a co-precipitation method. It was found that the Cr 3+ activators undergo a weak crystal field and present a NIR emission band peaking at 768 nm under blue light excitation (430 nm). Meanwhile, the K 2 LiScF 6 :Cr 3+ exhibits a high activation energy (0.537 eV), a weak electron-phonon coupling (EPC) effect and a remarkable photoluminescence thermal stability at 423 K, with an intensity of 95.1% of that at room temperature. Profiting from the luminescent properties, clear night vision images and human palm vein photographs were realized by coating the K 2 LiScF 6 :Cr 3+ phosphor on a blue InGaN chip and using it as a lighting source, suggesting its applicability in light-emitting diodes for NIR spectroscopy applications.
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Chenye Xie,Hui Yan,Yuanfang Song,Yuxi Song,Chuanwei Yan,Ao Tang
Renewable energy integration requires a safe and efficient solution to effectively store and release electrical energy in a vast scale. Cost-effective iron-chromium redox flow battery is a reviving alternative for long-duration grid-scale energy storage applications . However, sluggish kinetics of Cr 2+ /Cr 3+ redox reaction along with parasitic hydrogen evolution at anode still significantly limits high-performance operation of iron-chromium flow batteries . Herein, a bimetallic Pb/Bi electrocatalyst is delicately designed and fabricated on carbon felt electrode, which synergistically boosts Cr 2+ /Cr 3+ kinetics and alleviates hydrogen evolution. Combined experimental characterization and theoretical calculation prove that metallic Bi substantially enhances Cr 2+ /Cr 3+ reversibility owing to strong adsorption and intensified Cr-3d and Bi-6p orbitals hybridization, while Pb endowed with a high activation energy barrier effectively alleviates hydrogen evolution. Benefitting from the bimetallic Pb/Bi electrocatalyst with optimized Pb/Bi ratio, the iron-chromium flow battery demonstrates low polarizations and substantially enhanced rate performance as compared to the flow cell using pristine carbon felt, with an energy efficiency of 77% readily achieved at 125 mA cm −2 , which offers a deep insight into development of high-efficiency electrocatalyst for high-performance operation of iron-chromium flow batteries .
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Baochen Wang,Cheng Yan,Kaiwei Shen,Weiwei Lin,Yan-gai Liu,Ruiyu Mi,Chao Zeng
Cr 3+ doped phosphor shows great potential for near-infrared (NIR) light-emitting diodes (LED), but it suffers from low quantum efficiency and poor thermal stability. Herein, a novel Cr 3+ doped broadband NIR garnet Ca 3 Sc 2 Ge 3 O 12 phosphor was developed. The multisite structure of the emission band is investigated by site-selective spectroscopy and is attributed to the octahedral Cr 3+ perturbed by defects. Moreover, we propose different strategies to enhance the luminescence of the phosphor, including enhancement of crystallinity and elimination of defects. Compared with the initial sample, the emission intensity of the optimized phosphor is improved for 8.6 times. The optimal Ca 3 Sc 2 Ge 3 O 12 : 0.06Cr 3+ phosphor exhibits excellent thermal stability. At 423 K, the integral emission intensity of the optimal sample remains 94.7% of that at room temperature. Finally, high-performance NIR LED was fabricated using a blue LED and the title phosphor. The packaged LED lamp has high radiance (109.3 mW@300 mA) and photoelectric efficiency (15.96%@40 mA). Our study not only provides a boulevard for enhancing the luminescence of Cr doped NIR phosphor, but also gives a new perspective for understanding the multisite luminescence of Cr 3+ in garnet host.
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