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.
研究领域:
材料科学
·
光学
·
生物医学工程
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产品关联
DOI
高影响因子
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+.
研究领域:
分析化学
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生物医学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hongshi Zhang,Jiyou Zhong,Fu Du,Lei Chen,Xiaoli Zhang,Zhongfei Mu,Weiren Zhao
Broad-band near-infrared (NIR) phosphors are essential to assembling portable NIR light sources for applications in spectroscopy technology. However, developing inexpensive, efficient, and thermally stable broad-band NIR phosphors remains a significant challenge. In this work, a phosphate, KAlP2O7, with a wide band gap and suitable electronic environment for Cr3+ equivalent substitution was selected as the host material. The synthesized KAlP2O7:Cr3+ material exhibits a broad-band emission covering 650–1100 nm with a peak centered at 790 nm and a full width at half-maximum (fwhm) of 120 nm under 450 nm excitation. The internal quantum efficiency (IQE) was determined to be 78.9%, and the emission intensity at 423 K still maintains 77% of that at room temperature, implying the high efficiency and excellent thermal stability of this material. Finally, a NIR phosphor-converted light-emitting diode (pc-LED) device was fabricated by using the as-prepared material combined with a 450 nm blue LED chip, which presents a high NIR output power of 32.1 mW and excellent photoelectric conversion efficiency of 11.4% under a drive current of 100 mA. Thus, this work not only provides an inexpensive broad-band NIR material with high performance for applications in NIR pc-LEDs but also highlights some strategies to explore this class of materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Hao Tang,Ying Xu,Xianhua Cheng
In this study, Cr 3+ and Mg 2+ co-doped β-NaYF 4 :Yb 3+ /Er 3+ (NYFYE) microcrystals were synthesized for the first time by the facile hydrothermal method . Cr 3+ and Mg 2+ co-doping was confirmed to influence the structure, morphology and UCL property of NYFYE microcrystals. The growth mechanism of NYFYE microcrystals doped with different Cr 3+ and Mg 2+ was discussed in detail. With 16 mol% Cr 3+ and 4 mol% Mg 2+ co-doping into NYFYE, the UC emissions were enhanced to 7 times (green) and 4 times (red) higher than those of the undoped counterpart, and the mechanism was explored by considering the different roles of Cr 3+ and Mg 2+ , the surface quenching and concentration quenching effects. This finding suggests the co-doping of two different impurity ions may be a better approach than corresponding single impurity ion doping for morphology control and UCL intensity enhancement, which is instructive for high performance UC crystals design.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Ruiqi Shi,Shihai Miao,Xulong Lv,Dongxun Chen,Yi Zhang,Yanjie Liang
The utilization of phosphor-converted light-emitting diodes (pc-LEDs) as compact short-wave infrared (SWIR) emitters has emerged as a promising strategy for miniature SWIR spectrometers in portable devices, enabling diverse applications such as nondestructive identification, bioimaging, night-vision surveillance, and optical communication. However, discovering phosphors capable of efficiently absorbing blue light and emitting pure SWIR light (>900 nm) remains a significant challenge. Here, highly efficient and thermally stable SWIR luminescence of Yb 3+ upon blue LED excitation by employing Cr 3+ –Yb 3+ energy transfer in Y 3 Ga 5 O 12 garnet is reported. The prepared Y 3 Ga 5 O 12 :Cr 3+ ,Yb 3+ phosphor exhibits intense SWIR emission spanning from 900 to 1150 nm at 438 nm excitation, coupled with ultra-high internal/external quantum efficiency of 80.8%/40.2% and excellent luminescence thermal stability (108%@150 °C). A SWIR pc-LED prototype fabricated by incorporating the optimized phosphor with a commercial 450 nm blue LED chip, shows exceptional SWIR luminescence performance, delivering a SWIR output power of 92.7 mW at a driving current of 350 mA and a photoelectric efficiency of 21.5% at 10 mA. This work opens up a new avenue for designing SWIR phosphors that exhibit efficient and thermally stable photoluminescence with blue LED excitation, demonstrating significant potential for next-generation high-power compact SWIR light sources.
研究领域:
材料科学
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光学工程
·
光电子学
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Chaowei Yang,Dongwei Zheng,Xikun Zou,Xiangyi Dai,Baoling Tang,Maxim S. Molokeev,Xuejie Zhang,Haoran Zhang,Yingliang Liu,Bingfu Lei
Far-red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high-performance Cr 3+ -doped FR phosphors. This study developed a FR phosphor, Ca 1.8 Mg 1.2 Al 2 Ge 3 O 12 :Cr 3+ (CMAGG: Cr 3+ ), using the cation substitution strategy. Under 438 nm blue light excitation, the phosphors display FR emission centered at 720 nm with a full width at half maximum (FWHM) of 91 nm. Benefit from the favorable match with the FR phytochrome (P fr ), the phosphor is combined with InGaN blue light chips to create a FR phosphor-converted light-emitting diode (pc-LED), which is used in Italian lettuce growth experiments and it results shown in a 15% increase in fresh weight and a 6.5% increase in dry weight. Notably, supplemental FR light modulated its growth morphology. The results of this study will be useful for further research on novel Cr 3+ -doped FR phosphors to meet the precise spectral requirements for plant growth.
研究领域:
植物学
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材料科学
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DOI
高影响因子
Frontiers of Materials Science
·
2019
·Vol. 14
·期 1
·73-80
·
IF 1.701
Zhang Dong,Chen Jingxin,Du Chunyu,Zhu Bingjun,Wang Qingru,Shi Qiang,Cui Shouxin,Wang Wenjun
ZnAl 2 O 4 :Cr 3+ hollow spheres composed of secondary nanoparticles with single spinel phase were fabricated using carbon templets. Monitoring the emission of 687 nm, two wide excitation bands attributed to the electrons of Cr 3+ transiting from 4 A 2g ( 4 F) → 4 T 1g ( 4 F) and 4 A 2g ( 4 F) → 4 T 2g ( 4 F) were observed. The broad excitation band at about 397 nm was asymmetric and consisted of two peaks, indicating that there was a trigonal distortion existing in the lattices. The intensity of all emitting peaks revealed sharp increasing trend with the sintering temperature increase, and the intensity of emission at 698 nm assigned to inversion defects was more intense than that of emission at 687 nm assigned to octahedral Cr 3+ ions in the undistorted spinel lattice. The samples with higher synthesized temperature revealed longer decay time, and the relative weightage of shorter decay time component decreased with the increase of sintering temperature, indicating that the surface defects decreased.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
F.Y. Zhao,H. Cai,S.Y. Zhang,Z. Song,Q.L. Liu
Searching for broadband near-infrared (NIR) materials with high efficiency and excellent thermal luminescence stability is of great significance because of their widespread spectroscopic applications. Different element substitution can modulate the structure and crystal field of host lattice so as to regulate the luminescent properties. Herein, we report the octahedron-dependent NIR luminescence in Cr 3+ -doped KMP 2 O 7 (M = Ga, Sc, In, and Lu) phosphors and investigate the effect of octahedral environment on luminescent properties, aiming to provide guidance for host material selection. The decreased crystal field strength leads to the apparent spectral red shift from 815 to 900 nm for the samples of M = Ga to Lu. The small Stokes shift as well as weak electron–phonon coupling effect decreases the non-radiative transition probability and thus gives rise to the highest emission intensity and excellent thermal stability of Cr 3+ -doped KGaP 2 O 7 . The optimal sample, KGa 0.89 P 2 O 7 :0.11Cr 3+ , possesses an internal/external quantum efficiency of 55.8%/36.6%, and its integrated emission intensity at 423 K can maintain 68% of that at room temperature . Finally, we investigate the potential applications in non-destructive examination field by manufacturing a NIR phosphor-conversion light-emitting diode device.
研究领域:
材料科学
·
光学材料
·
无机化学
·
固体物理
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Jie Zhu,Yang Sun,Meng-Xin Duan,Zheng-Wu Wang,Xin Tan,Zhen Yu,He-Fang Wang
The fast and accurate detection of β-lactamase is a prerequisite of customized treatments and food safety. We present a pretreatment-free dual-excitation three-mode detection of β-lactamase by using ZnAl2O4:Cr3+ etched by ethylenediaminetetraacetic acid disodium (ZAO-EDTA) as a phosphorescent probe and nitrocefin as the signal mediator. The changes in the wavelength overlaps of UV–vis absorbance of nitrocefin upon interactions with β-lactamase and the dual excitation of ZAO-EDTA enable the design of three detection modes: i.e., the enhanced emission when excited at 393 nm, the quenched emission when excited at 533 nm, and the ratio of enhanced excitation of 393 nm and decreased excitation of 533 nm to determine β-lactamase. All three modes have a wide linear range, high sensitivity and selectivity, and fine anti-interference capability. The lowest limit of detection is observed in the ratiometric excitation mode (0.2 U·L–1), and the proposed method can directly detect β-lactamase in bacteria and milk samples without any pretreatments, with the spiked recoveries of 95.3–113% and relative standard deviation < 3.1%. Therefore, the proposed method would be attractive for the detection of β-lactamase in a complex sample, and the ZAO-EDTA probe can be widely used to establish other excitation ratiometric optosensings by changing other signal mediators.
研究领域:
分析化学
·
生物传感
·
食品安全
·
微生物学
✓ 已验证
DOI
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Daochuan Duan,Shijie Yu,Yubo Wu,Yan Dong,Qiyue Shao,Jianqing Jiang
Far-red-emitting (700−740 nm) phosphors are essential for the fabrication of plant lighting phosphor-converted light-emitting diodes (pc-LEDs). However, the development of highly efficient, thermally stable, and spectrally matched far-red phosphors still remains a challenge. Herein, far-red GdAlO 3 :Cr 3+ (GAO:Cr 3+ ) phosphors were synthesized via solid-state reaction and investigated for plant lighting pc-LED applications. A low-temperature flux-assisted synthesis strategy was adopted to improve the crystalline quality, suppress the defect formation, and maintain the valence state of Cr 3+ in the phosphors, finally leading to significant luminescent enhancement (∼10 times). The GAO:Cr 3+ phosphors show the 2 E sharp-line emissions around 730 nm, which is highly matched with the far-red absorption band of plants. The optimized GAO:0.01Cr 3+ phosphor exhibits a high internal quantum efficiency of 98.3% and zero thermal quenching even up to 250°C. The fabricated pc-LED can generate an overall output power of 78.1 mW at 100 mA drive current, with a high energy conversion efficiency of 25.3%. The findings demonstrate the great potential of GAO:Cr 3+ as far-red-emitting phosphor materials for plant growth pc-LED applications.
研究领域:
材料科学
·
光电技术
·
植物生物学
·
农业工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 37
·14214-14220
·
IF 4.569
Song Qing,Xi Zhang,Tao Yang,Lingxiang Chu,Yayun Zhou,Jing Wan,Zhengliang Wang,Huaijun Tang,Qiang Zhou
In this work, a series of Cr3+-doped A2NaYF6 (denoted as ANYF:Cr; A = K, Rb, and Cs) fluoroyttrate double-perovskites with broad blue excitation and near-infrared (NIR) emission bands were prepared using a high-temperature solid-state reaction method. The physicochemical and spectroscopic properties of the as-prepared products, including crystal structure, bandgap, morphology, luminescence behaviour and optical performance, were studied in detail. The results show that the Cr3+ activators undergo a decreasing crystal field in ANYF in the direction from K to Cs, yielding a red shift of the emission peak position from 758 to 786 nm, whilst the full-width-at-half-maximum (FWHM) expands from 98 to 104 nm. By virtue of the broadband NIR emission, clear structural images of the tangerine section, mini LED flashlight and circuit board were obtained by merging the optimal RNYF:Cr phosphor on a blue InGaN chip, implying its potential use in light-emitting diodes for non-destructive testing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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