Polymers
·
2022
·Vol. 14
·期 10
·2025
·
IF 4.967
Tao Li,Yu-Jing Sheng,Xiao-Li Sun,Wen-Ming Wan,Yanru Liu,Qingrong Qian,Qinghua Chen
The isosteric replacement of C═C by B–N units in conjugated organic systems has recently attracted tremendous interest due to its desirable optical, electronic and sensory properties. Compared with BN-, NBN- and BNB-doped polycyclic aromatic hydrocarbons, NBN-embedded polymers are poised to expand the diversity and functionality of olefin polymers, but this new class of materials remain underexplored. Herein, a series of polymers with BNB-doped π-system as a pendant group were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization from NBN-containing vinyl monomers, which was prepared via intermolecular dehydration reaction between boronic acid and diamine moieties in one pot. Poly{2-(4-Vinylphenyl)-2,3-dihydro-1H-naphtho[1,8-de][1,3,2]diazaborinine} (P1), poly{N-(4-(1H-naphtho[1,8-de][1,3,2]diazaborinin-2(3H)-yl)phenyl)acrylamide} (P2) and poly{N-(4-(1H-benzo[d][1,3,2]diazaborol-2(3H)-yl)phenyl)acrylamide} (P3) were successfully synthesized. Their structure, photophysical properties and application in metal ion detection were investigated. Three polymers exhibit obvious solvatochromic fluorescence. As fluorescent sensors for the detection of Fe3+and Cr3+, P1 and P2 show excellent selectivity and sensitivity. The limit of detection (LOD) achieved by Fe3+is 7.30 nM, and the LOD achieved by Cr3+is 14.69 nM, which indicates the great potential of these NBN-embedded polymers as metal fluorescence sensors.Keywords:NBN-embedded polymers;boron-containing polymers;solvatochromic fluorescence;metal ion detection
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 47
·16631-16637
·
IF 6.4
Xiangyu Zhang,Xiaochun Hou,Jie Gao,Zhigang Wang,Xiaogang Zhao,Chunlong Xu,Dangli Gao
Persistent luminescent anti-counterfeiting materials and techniques are highly required to protect products and the rights and interests of consumers. However, traditional persistent materials maintain almost unchanged persistent luminescence (PersL) color after cessation of excitation and a characteristic that can be easily imitated using sophisticated forgery techniques. Herein, Zn3Ga2Ge2O10 (ZGGO):Cr,Mn phosphors with “chameleon” PersL behavior are developed. Strong red and green PersL can be obtained simultaneously after the cessation of UV excitation. In addition to the color changes observed in photoluminescence (PL), these phosphors exhibit a dynamic shift in PersL color from green to yellow/red within a single phosphor with a time delay or in response to an environment temperature increase. The mechanism of the temperature-dependent changeable color in PersL is proposed based on different carrier paths for different traps via temperature management. Persistent materials easily integrate the advantages of changeable PL color by excitation wavelength management and PersL colors via temperature management into the same phosphor. Especially, these phosphors are simultaneously used in information storage and multi-level encryption, promising enormous potential for next-generation anti-counterfeiting applications.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ziyang Wu,Jinmeng Xiang,Changheng Chen,Zexun Li,Xianju Zhou,Yuehui Jin,Chongfeng Guo
As a new generation of near-infrared (NIR) light source, phosphor-converted NIR light emitting diodes (NIR pc-LEDs) have broad application prospects in biological tissue imaging, night vision and chemical composition analysis . However, most NIR emitting phosphors are still limited to short-wavelength, narrow-band emission and low efficiency. Here, based on the multi-site occupation strategy, the NIR phosphor Mg 2 LaTaO 6 :Cr 3+ (MLT:Cr 3+ ) achieves an efficient broadband NIR emission with the full width at half maximum (FWHM) of 203 nm in the range of 600–1300 nm under the excitation of 468 nm blue light. The phosphor MLT:0.01Cr 3+ not only exhibits an excellent internal quantum efficiency (IQE) of 85.6 %, but also has good thermal stability and remains about 64.2 % photoluminescence (PL) intensity of room temperature at 423 K. Furthermore, the MLT:0.01Cr 3+ phosphor was combined with a blue LED chip to fabricate the NIR pc-LED device, and its potential applications were successfully realized in information encryption, bioimaging and the qualitative or quantitative analysis of mixture of ethanol and water.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Kang Cheng,Xinyue Liu,Rongbo Ma,Bin Li,Chong Yang,Xinyong Gong,Weichao Huang
Li 2 MgTiO 4 :Cr 3+ , Mn 4+ phosphors were successfully synthesized by the high-temperature solid-state reaction method. Cr 3+ , Mn 4+ co-doped Li 2 MgTiO 4 phosphors have two emission peaks at 674 nm and 719 nm, corresponding to 2 E→ 4 A 2 transitions of Mn 4+ and 2 E→ 4 A 2 transitions of Cr 3+ , respectively. The two emission peaks are matched with the absorption of P R and P FR , and the intensity ratio of the two emission peaks is adjusted by changing the doping concentration of Mn 4+ , indicating that the phosphors have potential applications in plant cultivation. In addition, it can be observed that the emission peak corresponding to Mn 4+ can decrease sharply with the increase of excitation wavelength, while the emission peak corresponding to Cr 3+ can change little, which indicates that the phosphors can be used for wavelength detection. The security ink prepared by Li 2 MgTiO 4 :Cr 3+ , Mn 4+ phosphors shows that it can be applied in anti-counterfeiting labels. These results suggest that Li 2 MgTiO 4 :Cr 3+ , Mn 4+ have the great potentiality to be used for plant cultivation, wavelength detection and anti-counterfeiting.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 24
·5186-5194
·
IF 6.569
Yan Zhang,Yanjie Liang,Shihai Miao,Dongxun Chen,Shao Yan,Jingwei Liu
A series of Cr3+-doped BaMSi3O9 (M = Zr, Sn, Hf) near-infrared emitting phosphors with tunable luminescence properties have been successfully synthesized by using a simple solid-state reaction method. The developed BaMSi3O9:Cr3+ phosphors show a broad near-infrared emission band ranging from 650 nm to 1200 nm with a peak wavelength longer than 800 nm and a full width at half maximum (FWHM) of more than 155 nm upon blue light excitation. The optimized phosphor also demonstrates good thermal stability, whose emission intensity at 150 °C can retain about 59% of its initial intensity at room temperature. The near-infrared LED prototypes constructed by combining the BaMSi3O9:Cr3+ phosphor with a blue LED chip give a maximum output power of 12.19 mW at a drive current of 320 mA. By using the fabricated near-infrared LED device as a lighting source, night-vision lighting and blood vessel imaging of human fingers and arms are successfully realized, demonstrating the great potential of BaMSi3O9:Cr3+ phosphors for near-infrared LED applications.
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SOLID STATE IONICS
·
2019
·
IF 2.886
Hengxu Song,Yuhong Zhao,Yongqiang Niu,Hua Hou
Medium-temperature molten salt reserve primary cell utilizes low-melting nitrate electrolyte, that is considered suitable for geothermal borehole as well as oil and gas exploration . In this work, Cr 3+ and F − ions were introduced into spinel lithium manganate oxides by high-temperature solid-state method and verified by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The effects of fluorine content on the morphology and discharge performance of the LiCr 0.1 Mn 1.9 O 4− x F x (0 ≤ x ≤ 0.5) have been studied in LiCr 0.1 Mn 1.9 O 4− x F x /LiNO 3 -KNO 3 -Ca(NO 3 ) 2 /Li-Mg-B system. Fluoride-doped samples have a significant improvement in discharge performance at the condition of 10 mA·cm −2 and 250 °C because of the stabilization of the crystal structure. Factors of operating temperature and current density have a significant effect on battery discharge performance, and the surroundings of 10 mA·cm −2 and 200–250 °C contributes the battery to achieve high performance. That indicates the LiCr 0.1 Mn 1.9 O 4− x F x /LiNO 3 -KNO 3 -Ca(NO 3 ) 2 /Li-Mg-B battery shows great potential in geothermal borehole as well as oil and gas exploration environment.
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LUMINESCENCE
·
2024
·Vol. 39
·期 4
·e4730
·
IF 3.2
Kang Cheng,Weichao Huang,Xinyong Gong,Chaoyong Deng
Near-infrared light sources have potential applications in many fields. Cr 3+ is a good luminescence centre to prepare near-infrared phosphors. Improving the performance of existing near-infrared luminescent materials has indeed attracted great interest from researchers. The luminescence properties of Zn 2 TiO 4 :Cr 3+ were improved by crystal field engineering strategies. Zn 2+ –Ti 4+ was partially replaced using a Li + –Nb 5+ ion pair based on the Zn 2 TiO 4 :Cr 3+ phosphors. Luminescence Cr 3+ -activated luminescent materials are sensitive to changes in the local crystal structure and crystal field environment. Doping of Li + –Nb 5+ increased the luminescence intensity up to 2.7 times that of the undoped sample. Also, the thermal stability of the phosphor was greatly increased by the replacement of Li + –Nb 5+ .
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高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Chengyue Li,Xia Cai,Yaochun Qiang,Xuesong Shi,Yujia Jiang,Yan Chen,Fengqin Lai,Bo Wang,Yifan Leng,Weixiong You
Blue-light activated long afterglow luminescence phosphors have attracted much attention because of their potential application in many fields. Herein, the influence of trap depth and the quantity of electrons captured by the traps on the long afterglow luminescence properties were systematically revealed through a comparative analysis of the long afterglow luminescence performance of the series of Y 3 Al 5-x Ga x O 12 (YAGG):Ce 3+ , Cr 3+ (x = 0, 1, 2, 3, 4, 5) phosphors. To achieve long afterglow luminescence, it requires that the traps can effectively capture electrons, and possess an appropriate trap depth. Additionally, it is discovered that the quantity of electrons captured by the traps is the main factor affecting the duration of long afterglow luminescence. The more electrons are captured, the longer the afterglow lasts. The quantity of trapped electrons is inversely proportional to the energy differences between CB M -Ce 5d and trap depth. The sample exhibits the high quantity of trapped electrons attributable to its small energy differences which allows electrons to be directly captured by traps through the tunneling effect. On this basis, the effects of crystal field splitting (ε cfs ), centroid shift (ε c ), and the degree of dodecahedral distortion (D (YO)) on trap depth (E T ) were discussed to manipulate the trap depth, demonstrating there is a significant positive correlation between ε c -ε cfs (2(1-10D(YO))) and E T values for the garnet structure A 3 B 2 C 3 O 12 , when the ion doped at the A-position remains constant and the ions at the B and C positions vary. Notably, A larger D (YO) value corresponds to a deeper trap depth. This study provides a new perspective toward the development and design of long afterglow materials with superior afterglow emission.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Wei Zhao,Li Li,Faling Ling,Yongjie Wang,Guotao Xiang,Xianju Zhou,Sha Jiang,Zhiyu Yang,Yongbin Hua,Jae Su Yu
Lead-free double perovskite materials have attracted lots of interest because they can be doped with luminescence activators to modify their optical characteristics and improve photoluminescence performances. Herein, a solvothermal method was utilized to synthesize single Cr3+-doped Cs2NaInCl6 phosphors. Under 292 nm excitation, Cr3+-doped Cs2NaInCl6 microparticles exhibited a strong broad near-infrared emission with a good photoluminescence quantum yield of 42.9%. The prepared sample exhibited a prominent peak at 960 nm and a full width at half maximum of 138 nm, which can be attributed to the spin-allowed transition (4T2 → 4A2) of Cr3+ ions. Additionally, the emission band of Cr3+ displayed a noticeable red shift as temperature increased owing to the variations in the strength of the crystal field. The thermometry based on the bandwidth and band-shift modes showed good sensitivities of 0.337 nm K−1 and 0.272 nm K−1, respectively. Finally, the security ink was made for information encryption.
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Food Science and Human Wellness
·
2017
·
IF 0
Chi-Fang Peng,Ying-Ying Zhang,Zhi-Juan Qian,Zheng-Jun Xie
In this work, glutathione capped CdTe QDs (GSH-QDs) were prepared through a one-pot process and found to be quenched by Cr 3+ , Ag + and Cu 2+ ions. Cr 3+ and chromium (III) picolinate could be quantitatively measured after masking Cu 2+ and Ag + ions by sulfide. Under optimal conditions, linear quenching was observed for Cr 3+ in the ranges of 0–2.0 μM and the limit of detection was 3.0 nM. The recoveries for Cr 3+ in vitamin supplements obtained were from 92.5% to 106%. The determination results of chromium (III) picolinate in vitamin supplement samples were compared to that obtained using flame atomic absorption spectrometry (FAAS) method, and the result showed good reliability.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 15
·4711-4720
·
IF 6.1
Zhexuan Gao,Yi Zhang,Yinyan Li,Shilong Zhao,Peng Zhang,Xiaolong Dong,Degang Deng,Shiqing Xu
The second near-infrared window (NIR-II, 1000–1700 nm) emitting phosphor is a key component for the phosphor-converted light-emitting diode (pc-LED), which has garnered significant attention. However, it remains a major challenge to discover efficient NIR-II broadband phosphors that can be excited by blue LEDs. Herein, Cr3+ and Ni2+ ions were co-doped into the Li2ZnSn3O8 (LZSO) host. LZSO:Cr3+,Ni2+ phosphor achieves a broadband NIR-II emission peak at 1465 nm with a large full width at half maximum (FWHM) of 300 nm and internal quantum efficiency (IQE) of 43.31% under excitation at 426 nm because of the efficient energy transfer (ET) from Cr3+ to Ni2+. In addition, a dual-emissive doped phosphor across the NIR-I (700–1000 nm) and NIR-II regions with a higher sensitivity at physiological temperatures was obtained. The relative sensitivity value (Sr) reaches 1.44% K−1 at 293 K, indicating that the LZSO:Cr3+,Ni2+ phosphor is a potential candidate for NIR optical thermometers in biotechnological applications. The manufactured NIR-II pc LED provides a radiative flux of 8.26 mW with a photoelectric conversion efficiency of 2.71% at a drive current of 100 mA and has promising potential in night vision, medical imaging, and spectral analysis applications.
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DALTON TRANSACTIONS
·
2024
·
IF 3.5
Rongbo Ma,Tingting Zhang,Bin Cao,Xinyong Gong,Chaoyong Deng,Weichao Huang
The structural, optical and temperature-dependent luminescence properties of Y2Mg2Al2Si2O12:Cr3+ phosphors are investigated for their multifunctional applications. The as-prepared phosphors exhibited an intense far-red emission band around 600-850 nm with a peak at 687 nm, which matches well with the absorption band of plant phytochromes. Importantly, the optimized sample showed excellent thermal stability and the emission intensity at 423 K maintained about 77% of that at 298 K. The potential application of the phosphor in plant growth LED devices was also demonstrated. Furthermore, due to the unique thermal quenching behavior of Cr3+, a three-mode luminescent thermometry was designed based on the fluorescent intensity (FL), fluorescent intensity ratio (FIR), and full width at half maximum (FWHM) method. The maximum temperature relative sensitivity (Sr) of each mode can reach 2.74% K−1, 1.09% K−1, 1.47% K−1, respectively. These results indicate that the Y2Mg2Al2Si2O12:Cr3+ phosphors can address applications in plant growth and optical thermometry.
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高影响因子
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