Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 18
·4602-4607
·
IF 7.779
Meng Zhao,Shengqiang Liu,Hao Cai,Fangyi Zhao,Zhen Song,Quanlin Liu
Near-infrared (NIR) light devices have great potential in non-destructive testing and biomedicine fields. However, the lack of stable and efficient long wavelength NIR phosphors hinders their development. In this work, utilizing the compositional flexibility of antimonate double perovskites, we realized efficient and tunable broadband NIR emissions based on A2MSbO6:Cr3+ materials (A = Ca, Sr, and Ba; M = Ga, In, Sc, and Y). The NIR emission peaks ranged from 825 to 1010 nm by a composition modulation. In particular, Ca2ScSbO6:Cr3+ exhibits an 850 nm-centering broadband NIR emission with an internal quantum efficiency of 84.5% and a high thermal quenching temperature, retaining ∼71% at 410 K of the initial intensity at 80 K. Comparatively, Sr2InSbO6:Cr3+ with a 920 nm-centering broadband emission has 63.2% internal quantum efficiency. This work could help in discovering novel NIR phosphors with long-wavelength emissions and high efficiency.
研究领域:
生物医学工程
·
材料科学
·
光学成像
·
无损检测
·
分子探针开发
✓ 已验证
DOI
高影响因子
Materials Advances
·
2022
·Vol. 3
·期 15
·6171-6178
·
IF 0
Mingsheng Cai,Tianchun Lang,Tao Han,Damir Valiev,Shuangqiang Fang,Houjiang You,Bitao Liu,Ling Du,Zichao Xu,Elena F. Polisadova
Investigating narrow-band green emitting phosphors with high efficiency and good thermal stability is the main goal of the present light-emitting diode (LED) display research. Here, Ba1−xCaxScO2F:0.001Bi3+,0.001K+ (x = 0–0.12) perovskite phosphors, emitting narrow green light excited by a 415 nm chip, were developed using the cation substitution design strategy. The effects of Ca2+ substitution for Ba2+ in the Ba1−xCaxScO2F:0.001Bi3+,0.001K+ crystal structures and photoluminescence properties were investigated. All the phosphors show the cubic perovskite-type structure in the space group Pm3m. The evolution of the cell parameters and the Ba/Ca/K/Bi–O bond lengths were evaluated. The phosphors with the internal quantum efficiency of 77.4% exhibit bright green emission peaking at 510 nm under 415 nm chip excitation. The improvement of luminescence efficiency and thermal stability was discussed in detail in relation to the local structure variation. The cation substitution design strategy mentioned here can become an important approach to realize the spectral modulation through controlling the micro-environment in the lattice for excellent LED backlight displays.
研究领域:
材料科学
·
光学工程
·
无机化学
·
固体物理
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显示技术
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 3
·2327-2333
·
IF 2.324
Cao Renping,Xiao Hui,Zhang Falin,Cheng Xinyu,Su Lei,Xiao Fen,Luo Zhiyang,Chen Ting
A series of CaZrO 3 :Bi 3+ , CaZrO 3 :Eu 3+ , CaZrO 3 :Eu 3+ , Bi 3+ , and CaZrO 3 :Eu 3+ , Bi 3+ , Li + phosphors are synthesized by high-temperature solid-state reaction method in air. Their luminescence properties are researched, compared, and analyzed. CaZrO 3 :Bi 3+ phosphor under excitation at 310 nm emits deep-blue light with chromaticity coordinate (0.1612, 0.0254). CaZrO 3 :Eu 3+ phosphor under excitation at 310 and 395 nm shows red-emitting with chromaticity coordinate (0.6386, 0.3611). CaZrO 3 :Eu 3+ , Bi 3+ phosphor under excitation at 310 nm exhibits a systematically varied hue from deep-blue to red light by changing Eu 3+ ion concentration, and that with excitation at 395 nm only emits red light with chromaticity coordinate (0.6386, 0.3611). The energy transfer process from Bi 3+ to Eu 3+ ions may be indicated by their spectral properties. The optimal Eu 3+ and Bi 3+ ions concentrations are 5 mol% and 0.9 mol%, respectively. The emission intensity CaZrO 3 :Eu 3+ , Bi 3+ phosphor may be enhanced about 1.6 times due to the co-doping Li + ion as charge compensator role. The luminous mechanism of CaZrO 3 :Eu 3+ , Bi 3+ phosphor is explained by the simplified energy level diagrams of Bi 3+ and Eu 3+ ions.
研究领域:
材料科学
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无机化学
·
固体物理
·
发光材料
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光电功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Q.Q. Xiong,J.J. Lou,X.J. Teng,X.X. Lu,S.Y. Liu,H.Z. Chi,Z.G. Ji
Exploring advanced cathode materials is critical for the development of large-scale lithium ion storage. Herein we report nitrogen-doped carbon (N-C) coated LiFePO 4 nanospheres (N-C@LFP) synthesized by a facile hydrothermal plus chemical polymerization method . N-C@LFP nanospsheres exhibit diameters of 400–700 nm and show core-shell structure with a thin N-C layer of ∼2.5 nm. As a cathode for lithium ion batteries (LIBs), N-C@LFP nanospheres present excellent electrochemical performance with higher electrochemical reactivity, better reversibility and smaller polarization as compared to the unmodified pristine LiFePO 4 nanospheres . The N-C@LFP electrode delivers superior specific capacity of 158.4 mAh g −1 after 200 cycles at 1 C and good rate capability (107.5 mAh g −1 at 30 C). The enhanced electrochemical performance is attributed to the conductive N-C layer coating with fast ion/electron transfer. The N-C@LFP nanospheres are thus promising for commercial application in high-energy & power LIBs.
研究领域:
材料科学
·
电化学
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纳米技术
·
能源存储
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电池技术
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 12
·5553-5561
·
IF 3.5
Long Chen,Jiyou Zhong,Jiajun Wu,Weiren Zhao
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are considered as next-generation of NIR light sources for spectroscopy. However, it is still a challenge to develop an inexpensive broadband NIR phosphor with relatively long-wavelength (λem > 800 nm) emission. In this work, an octahedral Al3+-containing pyrophosphate Al0.5Ta0.5P2O7 with a cubic structure was chosen as a host for Cr3+. Synthesizing this material indicates that this phosphor exhibits a broadband NIR emission peaking at 850 nm with a full width at half maximum (FWHM) of 155 nm under 465 nm excitation. The crystal structure, morphology, local structure, and photoluminescence properties of this material were investigated in detail. The results revealed a full understanding of this new material. A NIR pc-LED device fabricated by using this material combined with a 450 nm LED chip generates a NIR output power of 10.7 mW and a NIR photoelectric conversion efficiency of 3.4% under a 100 mA driving current, which shows the possibility of this material to be utilized in NIR pc-LED applications. Moreover, this material exhibits a linear relationship between emission intensity, decay time and temperature in a wide temperature range, implying that excellent multi-model temperature sensing applications can be expected.
研究领域:
材料科学
·
光电子学
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无机化学
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固体物理
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传感器技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 13
·8145-8153
·
IF 4.036
Yulei Gao,Xiang Di,Fenfen Wang,Pingchuan Sun
Amorphous polymer-based room temperature phosphorescence (RTP) materials exhibiting tunable emission colors have received tremendous attention and are extremely challenging to prepare. Herein, polyacrylamide-based RTP materials with tunable multicolor emission were prepared via copolymerizing phosphor with concentration dependent luminescence colors and acrylamide with different molar ratios. The hydrogen bonding interactions and chemically crosslinked structures in these polymers effectively restrict the mobility of phosphors and activate efficient RTP emission. The molar ratio of phosphor and acrylamide has a significant influence on the photophysical properties of these polymers, which can be used to fabricate multicolor materials. In addition, the RTP intensity decreases with increasing humidity due to the disassociation of hydrogen bonding by adsorption of water, manifesting as a humidity sensor. Benefiting from the distinguishable RTP lifetimes and the responsiveness to humidity, triple encoding for information encryption is successfully realized.
研究领域:
高分子化学
·
分析化学
·
材料科学
·
传感器技术
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信息安全
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 49
·期 7
·10273-10279
·
IF 5.532
Daiyuan Liu,Ting Wang,Yichun Liu,Chao Wang,Zhichao Liu,Xiaodie Zhu,Ya Liu,Jian Zhang,Zhaowei Teng,Yang Zhong,Yakovlev Alexey Nikolaevich,Xuhui Xu
The photoluminescence behavior of inorganic phosphors is generally influenced by thermal stability, which determines the luminescence efficiency of the corresponding devices. Here, a series of Eu 2+ , Mn 2+ co-doped LiAl 5 O 8 blue-green-emitting phosphors with thermal robust are successfully fabricated. The concentration-dependent emission spectra and the decay curves of the as-obtained LiAl 5 O 8 : Eu 2+ , Mn 2+ samples manifest the occurrence of the energy transfer from Eu 2+ to Mn 2+ ions via dipole-dipole interaction, and the corresponding emitted colors are gradually modulated from blue to green under the excitation of 310 nm. Moreover, the zero-thermal-quenching luminescence is observed when the operation temperature is up to 423 K, which is attributed to the energy release from the trapping centers to emitting centers (Eu 2+ and Mn 2+ ) at high temperature. Furthermore, a warm white light-emitting diodes (WLEDs) device with correlated color temperature of 5061 K, a color rendering index of 80.6 and long-term stability is fabricated by combining UV LED chip (λ ex = 310 nm), as-obtained LiAl 5 O 8 : Eu 2+ , Mn 2+ phosphor, commercially available red phosphor and green phosphor. These results prove the potential application of the as-obtained LiAl 5 O 8 : Eu 2+ , Mn 2+ phosphor for UV-pumped WLEDs devices.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光电子学
·
无机化学
·
器件物理
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
·
2016
·
IF 2.189
Chen Chen,Xue-yan Zhu,Qiao-ling Gao,Fei Fang,Li-wei Wang,Xiao-jun Huang
Functional polyphosphazene cyclomatrix microspheres (PMS) containing glucose and dodecyl moieties were utilized for physical adsorption of lipase. In this regard, Candia Rugosa lipase was immobilized onto the above microspheres through physical adsorption, which exhibited catalytic hydrolysis of glycerol triacetate as the model reaction. As observed under transmission electron microscope (TEM) and scanning electron microscope (SEM), the size of all the microspheres ranged from 400 nm to 1 μm with a mean diameter of 680 nm. Zeta potential analysis demonstrated that the microspheres were negatively charged. The influences of buffer pH, substrate concentration and temperature were also studied along with reusability. The obtained results demonstrated that the immobilized lipase on deprotected glycosylated PMS (D-GPMS) showed the best performance and possessed the highest enzymatic loading activity around 1.0884 mmol L −1 min −1 g −1 , and retained nearly 50% of its initial activity even after 10 cycles of application. Moreover, the lipase-microsphere complex displayed high pH adaptability from 7 to 9 and temperature stability above 40 °C. From the viewpoint of biocompatible PMS support, the GPMS-lipase conjugate have potential applications in field such as food, medicine and environment.
研究领域:
生物材料
·
酶工程
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纳米医学
·
分子生物学
·
环境生物技术
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 20
·4544-4552
·
IF 6.569
Xin-Rui Yang,Xin Liu,Zujian Wang,Xue-Bin Deng,He-Jie Lu,Yu-Jia Li,Xifa Long,Ling Chen,Li-Ming Wu
We report a new DUV transparent (<200 nm) noncentrosymmetric Na1.5Rb0.5PO3F·H2O compound crystallizing in the Pmn21 space group. This compound exhibits the second largest birefringence in the monofluorophosphate family, Δnobv. = 0.04 at 546 nm, which is attributed to the nearly uniform alignment of the P–F bonds. The SHG response is observed to be 0.55 × KDP at 1064 nm. More interestingly, the precise substitution of NH4+ with Na+/Rb+ cations in the well-known structure (NH4)2PO3F·H2O leads to a stepwise reconstruction of the hydrogen bond networks, which eventually alters the crystal symmetry and the optical properties.
研究领域:
材料科学
·
晶体化学
·
光学材料
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无机合成
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 8
·3673-3677
·
IF 3.159
Xi Juan Zhao,Cheng Zhi Huang
A one step synthesis of water-soluble luminescent copper nanoclusters (CuNCs) reduced and protected by histidine is reported. When excited at 350 nm, the as-synthesized CuNCs exhibit luminescence centered at 456 nm with a quantum yield of 1.6%, which is different from that of histidine alone under the same experimental conditions. Upon addition of guanosine 5′-triphosphate (GTP), the emission of CuNCs is gradually quenched. While other nucleoside triphosphates including ATP, CTP and UTP as well as some inorganic anions such as P2O74−, PO43−, and CH3COO− have no such quenching effect, which indicates that the nucleobase instead of the phosphate anion plays an important role in the emission quenching of CuNCs. The most efficient quenching of the CuNCs induced by GTP can be ascribed to the most reducing ability of guanine among the other nucleobases. This interesting experimental result demonstrates that the as-synthesized CuNCs can be applied to sensing of GTP.
研究领域:
纳米材料
·
分析化学
·
生物传感器
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 24
·28077-28087
·
IF 2.478
Zhao Jiaqi,Hu Chen,Lu Jingyao,Sun Ruyi,Wang Zhen,Yin Yanzhen,Liu Wenlong,Gu Chengcheng,Li Zichao,Zhong Degao,Teng Bing
A series of single-phase white-emitting phosphors Ba 3 Bi(PO 4 ) 3 (BBP):8 at.% Dy, x at.% Eu were successfully synthesized through high temperature solid-phase method. The luminescence properties of BBP:8 at.% Dy, x at.% Eu were systematically investigated. Experimental results indicate the doping of Eu 3+ ions can effectively compensate the red light component in the emission spectrum and tune the correlated color temperature of BBP:8 at.% Dy, x at.% Eu from cool white light (5097 K) to warm white light (3661 K). Moreover, BBP:8 at.% Dy 3+ , 0.8 at.% Eu 3+ phosphor exhibits excellent thermal stability and the fluorescence intensity at 150 °C can still maintain 76% of that at 25 °C, while the activation energy is determined to be ~ 0.23 eV. In addition, the quantum efficiency of BBP:8 at.% Dy 3+ , 0.8 at.% Eu 3+ phosphor were measured to be 61%. These results suggest that BBP:8 at.% Dy 3+ , 0.8 at.% Eu 3+ can be a NUV-pumped single-phase white phosphors with excellent comprehensive performances.
研究领域:
材料科学
·
发光材料
·
无机化学
·
光学材料
·
固体化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2015
·Vol. 30
·期 5
·645-653
·
IF 1.647
Ruiqiong Wang,Ronglan Zhang,Bei Xu,Fei Yang,Jianshe Zhao,Shichao Zhang,Junlong Wang
Two novel series of cathode materials LiFe1−x Mx PO4/C (x ≈ 0.0040; M = Mn, Fe, Co, Ni, Cu, and Zn) composites based on metal phthalocyanines (MPc) and metal tetrasulfophthalocyanines (MPcTs) to modify lithium iron phosphate (LiFePO4) for lithium-ion batteries (LIBs) are in situ prepared by solvothermal and calcination techniques. Structures and morphologies of all the composites are characterized by normal methods. To evaluate the electrochemical performance of the composites, the charge/discharge capabilities, rate performance, cycling stabilities, cyclic voltammetry profiles, and electrochemical impedance spectroscopy plots of the LIBs using them as cathode materials are measured carefully. The results indicate that most of the composites deliver highly improved initial discharge capacity and show remarkable reversibility and cycling stabilities. Especially, composites using MPcTs as additives are more efficient for the improvement of specific capacity, rate capability, reversibility, and cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）