JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 1
·582-587
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IF 1.798
Cao Renping,Wang Wudi,Zhang Jinlong,Hu Qianglin,Jiang Shenhua,Xiao Fen,Ye Yuanxiu
CaZr(PO 4 ) 2 :Mn 2+ and CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphors are synthesized by high-temperature solid state reaction method in air. CaZr(PO 4 ) 2 :Mn 2+ phosphor shows green emission and its broad emission band peaking at ~545 nm within the range 470–650 nm is attributed to the 4 T 1 (G) → 6 A 1 ( 6 S) transition of Mn 2+ ion. The optimal Mn 2+ doping concentration is ~5 mol% in CaZr(PO 4 ) 2 :Mn 2+ phosphor. CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor with excitation 399 nm emits reddish-orange light, and it shows a systematically varied hue from green to yellow with excitation 405 nm by changing Sm 3+ and Mn 2+ ions concentration. The luminous mechanism of CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor is analyzed and explained by the simplified energy level diagrams of Mn 2+ and Sm 3+ ions in CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor. The experimental results are helpful to develop new Mn 2+ /Sm 3+ -doped materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
·
IF 2.653
Renping Cao,Ting Fu,Dedong Peng,Chunyan Cao,Wen Ruan,Xiaoguang Yu
Host SrSb 2 O 6 , SrSb 2 O 6 :Bi 3 + , SrSb 2 O 6 :Eu 3 + , and SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphors are synthesized by solid state reaction method in air. Host SrSb 2 O 6 with excitation 254 nm shows weak green-yellow emission in the range of 320–780 nm due to Sb 5 + → O 2– transition. SrSb 2 O 6 :Bi 3 + phosphor with excitation 365 nm emits green light within the range 400–650 nm owing to the 3 P 1 → 1 S 0 transition of Bi 3 + ion. SrSb 2 O 6 :Eu 3 + phosphor with excitation 254 nm exhibits a systematically varied hue from green to orange-red light by increasing Eu 3 + concentration from 0 to 7 mol%, and that with excitation 394 nm only shows orange-red light. The optimal Eu 3 + concentration is ~ 4 mol% in SrSb 2 O 6 :Eu 3 + phosphor. SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphor with excitation 254 and 394 nm emits orange-red light. Emission intensity of SrSb 2 O 6 :Eu 3 + phosphor may be enhanced > 2 times by co-doping Bi 3 + ion because of the fluxing agent and energy transfer roles of Bi 3 + ion in SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphor. The luminous mechanism of SrSb 2 O 6 :Eu 3 + , Bi 3 + phosphor is analyzed and explained by the simplified energy level diagrams of Sb 2 O 6 2 − group, Bi 3 + and Eu 3 + ions, and energy transfer processes between them.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 6
·2974-2980
·
IF 1.491
Zheng Yuhui,Hu Jing,Deng Surong,Gao Jinwei,Wang Qianming
High-purity LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm, Dy) phosphors with tetragonal zircon structures were successfully synthesized. The reactions have been carried out by multiple irradiations with very high efficiency. Transmission electron microscope images showed that the phosphors had rod-like structures with average lengths of about 200 nm. The host absorption edge of LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm) shifted to the longer wavelength side. Furthermore, the red emission of Eu 3+ ion and the orange emission of Sm 3+ ion are remarkably enhanced by encapsulating Bi 3+ in LuVO 4 system, whereas in the case of LuVO 4 : Dy 3+ /Bi 3+ , the host absorption and the yellow emission from dysprosium have been suppressed in the presence of Bi 3+ . These novel findings will facilitate their use in the display field.
研究领域:
材料科学
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光学材料
·
发光材料
·
无机化学
·
纳米材料
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Tian-Tian Cai,Yao Tian,Pengcheng Huang,Fang-Ying Wu
We developed a new core-shell ratiometric fluorescent nanoprobe simply prepared by a seeded growth method. The strong luminescence arising from the shell formed by coordination self-assembly of an alkaline phosphatase (ALP) substrate, l -ascorbic acid 2-phosphate (AAP), and Tb 3+ , together with the weak fluorescence of the core-a metal-organic framework, UiO-66-NH 2 , constitutes an ideal dual-emission characteristic. Since AAP can be specifically cleaved by ALP, the well-formulated core-shell nanostructure was destroyed upon exposure to ALP. In this case, the luminescence of Tb 3+ was quenched due to the inefficient antenna effect, while the fluorescence of UiO-66-NH 2 was strengthened by the synergistical enhancement of dual hydrolysates to inhibit the ligand-to-metal charge transfer (LMCT) process. Using the dual signal response, this nanoprobe was employed for ratiometric fluorescence detection of ALP activity in the range of 0.05–0.6 U mL −1 with a detection limit of 0.018 U mL −1 , accompanied by a discernible fluorescence color evolution from turquoise to blue. In virtue of good properties in accuracy, sensitivity, selectivity and simplicity, this assay enabled quantitative detection of ALP activity in human serum and efficient screening of ALP inhibitors. More Importantly, a smartphone-assisted paper-based sensing platform was designed for on-site visual analysis of ALP activity in human serum, which may be very promising as a facile, portable, and robust format to facilitate relevant biological and clinical applications.
研究领域:
生物化学
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医学诊断
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纳米技术
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 33
·19149-19156
·
IF 3.119
Liu Yang,Yu-Long Liu,Cheng-Guo Liu,Ying Fu,Fei Ye
A RhB@Zr-MOF composite with dual-emission properties was successfully constructed, which comprises a zirconium-based metal–organic framework and the luminescent dye molecule, Rhodamine B (RhB), embedded via the encapsulation method. The fluorescence intensity ratio of the two emissions was found to be ca. 370 nm/590 nm for RhB@Zr-MOF. The fluorescence intensity values of the two emissions of RhB@Zr-MOF can also be affected by the structures of analytes containing different organic groups. Due to the existence of the dual-emission properties in RhB@Zr-MOF, the relative fluorescence intensity of the emission peaks was introduced as a detection index instead of absolute fluorescence intensity. RhB@Zr-MOF, which possesses the characteristics of a built-in self-calibrating fluorescence sensor, was investigated for detecting cations, nitroaromatics and pesticides. Aside from high sensitivity and selectivity, recyclability is the most important property for sensing pesticides. This work shows that RhB@Zr-MOF can maintain its stability after 5 cycles of detecting nitenpyram, with LOD of 0.2 μM. These results demonstrate that dye@MOFs with dual-emission properties can be employed as multifunctional fluorescence sensors for different types of analytes, and that RhB@Zr-MOF provides a new paradigm for analyte sensing.
研究领域:
材料科学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Ning Xue,Jian Yao,Caihong Shi,Xinrui Wang,Wenying Shi,Chao Lu
The nanoplatelet-filled polymer composite (NFPC) materials have received increasing attention because of their high strength-to-weight ratio and toughness. However, high-performance NFPC materials still face many challenges: (1) how to transfer the intrinsic extraordinary performance of individual nanoplatelets into highly ordered macroscale bulk materials; (2) how to obtain a strong interface bonding between polymer and nanoplatelet filler; and (3) how to truly reflect the structure of NFPC film. Here, to address these problems, the flow-induced assembly method is employed to fabricate the large-size continuous, flexible, highly oriented, and transparent NFPC film. During flow-induced orientation, nanoplatelet and polymer can be coassembling together to form a highly ordered layered structure with dozens of layers. On the other hand, the layered double hydroxide (LDH) nanosheet filler with single layer and abundant hydroxyl sites is prepared to strengthen interface by forming hydrogen bonds with polymers. To explore the effect of multiscale structure on property, carbon dots (CDs) are introduced to light up the inorganic nanoplatelet. By fixing and confining CDs in a rigid environment, the CD-LDH-based composite film shows excellent dual emission characteristics, which can be used to evaluate gas barrier, humidity, and temperature with direct visualization, high sensitivity, and easy to operation.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Physics
·
2021
·
IF 3.56
Yang JianJun,Shao ShuangShuang,Li YaXin,Wang YueHui,Feng Chi
A large-scale growth of zinc oxide (ZnO) nanorod arrays on graphene sheets was fabricated by a hydrothermal technique, and the Fowler–Nordheim theory was used to build a model to describe the properties of the arrays’ field emission. The results indicated that the morphological characteristics of the ZnO nanorods grown on the graphene sheets can be easily tuned by varying the reaction time and concentrations of the reaction solution. The regular ordered ZnO nanorods arrays on the graphene sheets were obtained under the appropriate experimental conditions. Further, this composite cathode was demonstrated to possess excellent field emission properties due to the outstanding mechanical and electrical properties of graphene. The field emission current density of the composite cathode reached 1,448 μA cm–2 at the electric field of 16.5 V μm–1. The key parameter, field enhancement factor, reached 6,366, while the pure graphene cathode field is about 1,660. These specific nanorod arrays with enhancement of the field emission properties would be useful to sensor or modulator units for accessing networks.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 21
·13210-13216
·
IF 3.945
ChunWei Zhou,Yu Huang,YinLong Zhang,Bin Lu,YiFeng Xu,QuanLin Ye,XuXin Yang,JianQiang Zhong,Jian-Xin Tang,HongYing Mao
The booming growth of all inorganic cesium lead halide perovskites in optoelectronic applications has prompted extensive research interest in the fabrication of ordered nanostructures or microarrays for enhanced device performances. However, the high cost and complexity of commercial lithographic approaches impede the facile fabrication of perovskite microarrays. Herein, CsPbBr3 microarrays with tunable periodicities have been fabricated using a self-assembled polystyrene nanosphere template and a co-evaporation method. The periodicity of CsPbBr3 microarrays is precisely manipulated by simply modifying the size of polystyrene nanospheres. These microarrays are beneficial for light harvesting, leading to better light absorption ability and prolonged photoinduced carrier lifetime. The longest average carrier lifetime of 58.3 ns is obtained for CsPbBr3 microarrays with a periodicity of 1.0 μm. More importantly, the periodic structures of CsPbBr3 microarrays result in a tunable density of emitter tips in field emission devices. Compared to compact CsPbBr3 films, a 68.2% decrease of the turn-on field is observed for CsPbBr3 microarrays when the periodicity is 150 nm. The higher density of emitter tips leads to larger local field enhancement, and hence the largest field enhancement factor of 3346.6. Finally, a good emission current stability for CsPbBr3 microarray-based field emission devices has been demonstrated.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
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