KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Chao Quan,You Fu Zhou,D.C. Huang,Wen Tao Xu
SrAl2O4:Eu2+,Dy3+ long-lasting phosphors were incorporated AlN successfully by a conventional solid-state reaction in the reductive atmosphere. When a certain amount of AlN was doped, the specimen SrAl2O4-3xN2x: Eu2+, 0.01Dy3+ (x = 0.0-0.2) maintained the phase purity. Under the excitation at 398nm, an intense broadband emission centered at 514 nm, originating from the 4f65d1→4f7 transition of Eu2+, was observed. It is noteworthy that partial nitridation leads to an enhancement in the emission intensity up to 240%. The study of thermal stability shows that the intensity of SrAl2O3.55N0.3:Eu2+,0.01Dy3+ phosphor still remains 72% at 150 °C comparing with the initial, while only 62% for the un-doped phosphor. Taking enhanced photoluminescence (PL) property and good thermal stability into account, SrAl2O4-3xN2x:Eu2+, 0.01Dy3+ is a promising candidate for the phosphors used in alternating current (AC) LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Lei Lei,Deyu Wang,Yongfu Kang,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
The combination of a phosphor with semiconductor photocatalysts can provide photoactivity in the dark. Indeed, the phosphor acts as a “light battery”, harvesting photons during irradiation and later re-emitting light that can be used by the catalytic phase when in conditions of total darkness. This allows for continued activity of the composite catalyst, even in conditions of unstable light stimulation. In this study, we assess the use of a heterojunction, namely graphitic-C3N4/Ag3PO4, that enables efficient photoactivity specifically under visible light stimulation, in combination with a phosphor that exhibits green–blue phosphorescence (510 nm), that is SrAl2O4:Eu2+,Dy3+. Our findings showed that this combination was particularly interesting, noticeably displaying significant photoactivity in darkness, after short periods of activation by visible light. After finding the right combination and optimal ratios for maximum efficiency, the resulting catalyst composite was immobilized on resin supports with a fractal surface, printed by LCD-SLA 3D printing. The immobilization was effectuated via an aqueous-phase plasma-aided grafting (APPAG) process, using cold plasma discharge (CPD) and using vinylphosphonic acid (VPA) as a coupling agent. Whereas the colloidal photocatalyst displayed a serious problem of partial physical separation between the catalytic phase, g-C3N4/Ag3PO4, and the phosphor, the immobilization of the composite catalyst on polymer supports allowed solving this issue. Photodegradation assessments confirmed that the hybrid supported phosphor-enhanced catalyst was active, notably in dark conditions, as well as fairly photostable. This study offers new prospects for the fabrication of polymer-based panels for water purification, with round-the-clock activity and that are, in addition, extremely easy to recover and reuse, by comparison with colloidal catalysts.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 13
·3346-3351
·
IF 5.976
Jun Wan,Yuting Zhang,Yuan Wang,Ronghua Ma,Yimin Wu,Xvsheng Qiao,Xianping Fan
Commercial LED phosphors are usually prepared by a conventional solid-state reaction method and a subsequent ball milling process, which often results in non-uniform size distributions, irregular shape and impurity contamination of the phosphors. In this work, the SrAl2O4:Eu2+ cage-like microspheres with a uniform size distribution and excellent photoluminescence (PL) quantum yield (QY) are prepared by an epoxide-driven sol–gel route and subsequent heat treatment in a reducing atmosphere. This unique cage-like microstructure not only makes better use of the excited light but also significantly increases the PL quenching concentration of the Eu2+ ions. The optimum internal QY of the SrAl2O4:Eu2+ cage-like microspheres is measured to be up to 94.94%, much higher than the highest internal QY (55%) of the SrAl2O4:Eu2+ phosphors reported so far. The approach may be readily applied to prepare other lanthanide ions doped cage-like microspheres, implying a new route for preparing highly efficient PL phosphors with regular shape and uniform particle size.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 105
·期 2
·500-510
·
IF 2.606
Huang Anding,Wu Yikun,Pan Zixin,Wang Bangyu,Liang Xiaoping
In order to improve the water resistance of SrAl 2 O 4 :Eu 2+ , Dy 3+ , the composite long afterglow material Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ was prepared by covering uniform and stable Sr 2 MgSi 2 O 7 sol on SrAl 2 O 4 :Eu 2+ , Dy 3+ powder, which was synthesized via traditional solid-state method. The effects of various factors, such as the amount of ammonia, the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 and the content of H 3 BO 3 , on the structure and luminescent properties of Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ were investigated by the response surface method. The results show that the influence extent on both the initial afterglow brightness and water resistance are as follows:the amount of ammonia> the content of H 3 BO 3 > the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 . When the amount of ammonia, the molar ratio of Sr 2 MgSi 2 O 7 :SrAl 2 O 4 and the content of H 3 BO 3 is 1.64 mL, 11.10, and 0.006 mol, respectively, both the brightness and water resistance of Sr 2 MgSi 2 O 7 :Eu 2+ , Dy 3+ @ SrAl 2 O 4 :Eu 2+ , Dy 3+ are improved, the water resistance is 0.835 (51.82% higher than that of pure SrAl 2 O 4 ) and the initial afterglow brightness can reach 2793 mcd/m 2 (91.69% higher than that of pure SrAl 2 O 4 ), which were in good agreement with the predicted optimum value of 0.867 and 2720 mcd/m 2 , respectively. Under the optimization conditions, the synergistic action of SrAl 2 O 4 with excellent afterglow properties and Sr 2 MgSi 2 O 7 with high water resistance plays an important role in improving the water resistance without sacrificing brightness. Finally, the water-based light-emitting inks with SMSA as fluorescent pigment exhibit excellent luminescent properties in the dark.
Graphical abstract
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2024
·Vol. 14
·期 9
·3929
·
IF 2.5
Rungang Liu,Xueting Liu,Weikai Lin,Yingliang Liu
Preparing submicron and nanoscale phosphors with good optical properties for practical applications is a challenging task for current inorganic long afterglow luminescent materials. This study utilized commercialized SrAl2O4:Eu2+, Dy3+phosphors (SAOED) as raw materials and employed solvents with lower polarity or non-polar solvents for dynamic solvothermal treatment. The commercialized phosphor’s overall average particle size was reduced from 42.3 μm to 23.6 μm while maintaining the fluorescence intensity at 91.39% of the original sample. Additionally, the study demonstrated the applicability of the dynamic solvothermal method to most other commercialized inorganic phosphors. The experiment produced a high-brightness nano-sized phosphor with a yield of 5.64%. The average diameter of the phosphor was 85 nm, with an average thickness of 16 nm. The quantum efficiency of the phosphor was 74.46% of the original sample. The fingerprint imaging results suggest that the nano-sized phosphors have potential for practical applications.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiaoyan Wang,Yu Yuan,Jingru Lai,Xiaoli Shi,Mingye Ding
Solar-driven water splitting for hydrogen production is a pivotal technique for sustainable energy conversion. However, its efficiency is constrained by intermittent solar irradiation and rapid charge recombination. To overcome these limitations, designing a round-the-clock photocatalyst with high charge storage capacity that can still operate effectively under low light flux after sunset and promote charge carrier separation is a promising strategy. Herein, by selecting SrAl 2 O 4 :Eu 2+ /Dy 3+ persistent phosphors as electron-trapped centers and g-C 3 N 4 semiconductor as visible-light photocatalyst, SrAl 2 O 4 :Eu 2+ /Dy 3+ @g-C 3 N 4 composite has been successfully synthesized via in-situ growth strategy to form a conventional type II heterojunction photocatalyst. Benefiting from the excellent ability of charge storage and release from electron traps and the improved electron-hole separation efficiency, the designed round-the-clock photocatalyst exhibits the improved hydrogen production from 153.8 μmol g −1 h −1 to 560 μmol g −1 h −1 under visible-light irradiation, infrared-light-driven H 2 production of 932 μmol g −1 for 3 h and a dark activity of 269.1 μmol g −1 h −1 lasing for 0.5 h. This work provides a promising strategy for designing a highly efficient photocatalyst for wide-spectral-responsive and all-weather photocatalytic hydrogen production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 9
·2077
·
IF 5
Longfei Zhang,Ying Wang,Limin Peng,Zhilin Chen,Shaoyi Lyu,Siqun Wang
Long-term relief of indoor volatile pollution has become a competitive issue worldwide in both visible and dark environments. A novel self-luminous wood coating with carbon dots (CDs)/titanium dioxide (TiO2) nanomaterial coated SrAl2O4: Eu2+, Dy3+(CDs/TiO2@SAO) composite was prepared for the long-term degradation of formaldehyde through a simple sol-gel method. The microstructure, chemical composition, ultraviolet-visible (UV-vis) spectra, and long-lasting fluorescence of the CDs/TiO2@SAO photocatalyst were analyzed to illustrate the mechanism for degrading formaldehyde. The obtained CDs with a particle size of ~2–7 nm have a good graphite structure and presented good absorption in visible light. In addition, owing to the synergistic effect of the CDs/TiO2nanomaterial coating layer and the long-afterglow luminescence of the SAO phosphor, the CDs/TiO2@SAO composite can absorb a part of the visible light for photocatalytic degradation and store luminous energy efficiently at daytime so as to give out visible luminescence continuously for a few hours in the darkness. Furthermore, the functional wood coatings with CDs/TiO2@SAO composite presented continuous and efficient photocatalytic activity in the presence and absence of light exposure. The current research could provide a new strategy for designing an efficient photocatalyst for degrading formaldehyde pollution in the daytime with a visible light supply and in an indoor dark environment without an external light source.Keywords:carbon dots;core-shell microspheres;SrAl2O4: Eu2+, Dy3+phosphor;titanium dioxide;surface modification;photocatalytic degradation
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Optical Materials Express
·
2016
·Vol. 6
·期 11
·3375-3385
·
IF 2.657
Haibo Liu,Baoluo Feng,Li Luo,Chunlong Han,Peter A. Tanner
The phosphor Sr0.97Al2O4:0.01Eu2+, 0.02Dy3+ was synthesized by a high temperature solid state reaction in a reducing atmosphere. After charging by ultraviolet radiation, the persistent luminescence decay was divided into different time ranges and well-fitted by a biexponential function, but the two lifetimes became longer with time of persistent luminescence decay. The fractional amplitude of the shorter lifetime increased with time, whereas that of the longer lifetime decreased. The change in lifetime has been associated with the emptying of a pseudo-continuum of trap states either from different traps or different levels of the same trap species. The investigation in photostimulated persistent luminescence indicated the sample could emit bright persistent luminescence again under infrared light excitation after the UV light-excited persistent luminescence had decayed completely. The NIR photostimulation exhibited a continuous broad band, with maximum at 760 nm, representing the emptying of filled traps into the conduction band. These results also infer that the traps are pseudo-continuous but the assignment of Dy2+ as the trapped species cannot be excluded. The read-in and write-out properties of the phosphor have been elucidated and these convey applications in information storage and retrieval.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2020
·
IF 2.904
Tao Cai,Songtao Guo,Yongzeng Li,Di Peng,Xiaofeng Zhao,Weizhe Wang,Yingzheng Liu
Mechanoluminescence is a newly developed technology for the optical sensing of stress or surface pressure. One unfortunate limiting factor in its application is the sensors’ low sensitivity to stress (usually in the MPa range). In this study, an ultra-sensitive mechanoluminescent sensor is created based on the phosphor SrAl 2 O 4 :Eu 2+ , Dy 3+ , that showed greatly enhanced sensitivity (by a hundred times) than that of conventional mechanoluminescent sensors. This sensor took the form of a ceramic coating that was prepared via air plasma spray and vacuum tempering retreatment. Pure SrAl 2 O 4 :Eu 2+ , Dy 3+ powder was used with no supporting matrix to eliminate the negative effects of the elastic mismatch on the sensitivity. The sensor could resolve stress variations on the order of kPa based on the calibration results. We also demonstrated interesting applications based on this sensor, such as tactile sensing and air-pressure sensing, which show great promise for wireless mechanical perception.
研究领域:
材料科学
·
传感器与传感技术
·
陶瓷工程
·
光学材料
·
机械感知
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2016
·Vol. 65
·期 10
·1238-1244
·
IF 2.414
Saiqi Tian,Jiating Wen,Haojun Fan,Yi Chen,Jun Yan,Peikun Zhang
An amino-terminated long persistent luminescent phosphor (Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ ) was prepared based on inorganic SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor, chemically modified with 3-aminopropyltriethoxysilane (KH550). Fourier transform infrared and X-ray photoelectron spectral, thermogravimetric and scanning electron microscopic measurements confirmed the successful synthesis of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ . Then this amino-functionalized phosphor was introduced into polyurethane (PU) through urea linkages, and the effects of the chemical combination of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ and PU on the morphology, structure, storage stability, and mechanical, thermal and luminescent properties of the resultant long persistent luminescent polyurethane (LPLPU) were investigated. Compared with SrAl 2 O 4 :Eu 2+ ,Dy 3+ /PU composites prepared by physical blending, the LPLPU shows better mechanical properties and storage stability due to the good compatibility of Amino-SrAl 2 O 4 :Eu 2+ ,Dy 3+ with PU. More residues and higher initial decomposition temperature are observed because the interaction of the amino-phosphor and PU delays the degradation. Study of the luminescent effect reveals that the LPLPU shows more than 10 h afterglow after cessation of the excitation light, and the brightness of green light in darkness is basically the same as that of LPLPU and SrAl 2 O 4 :Eu 2+ ,Dy 3+ /PU. © 2016 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Dong Tu,Lingxiao Cui,Haonan Ju,Wenxuan Yao,Yufan Yuan,Hang Yang,Xueqin Liu,Guogang Li
High-Stability USL: SAO:Eu needs no UV radiation, cutting external effects and boosting practical ease and accuracy. • USL modulation: TL and Sm/Dy/Tm doping proved trap depth and carrier density dictate USL intensity. • Non-destructive testing: SAO:Eu USL enables a structural defect detection simpler than conventional ultrasonic testing. Ultrasonic-induced luminescence (USL), as a novel type of mechanically stimulated luminescence phenomenon, has attracted widespread attention in the fields of materials science and engineering in recent years. Currently reported USL materials suffer from poor stability, and most require UV excitation. In this study, we report a highly stable SrAl 2 O 4 :Eu 2+ material that does not require pre-excitation by a UV lamp. This material exhibits excellent stability in cyclic testing. By combining USL measurements at different pre-treatment temperatures with thermoluminescence testing, and by introducing different activating ions, we establish a close relationship between USL and the carrier density in the traps. Furthermore, a novel structural defect detection method was designed based on the USL properties of this material, offering greater simplicity and convenience compared to traditional ultrasonic testing. This study not only delivers a material with high stability for USL but also introduces a novel paradigm for industrial nondestructive testing.
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Junwen Cai,Xin Jiang,Linfeng Zhang,Benoit Couturaud,Wen-Zhuo Tang,Yao-Yan Zhang,Rui-Bo Jin,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
A multifunctional, multiphase-supported photocatalyst was fabricated via the combination of LCD three-dimensional (3D) printing, cold plasma discharge (CPD) technology, and surface chemistry to be used for the degradation of organic pollutants in water and for the generation of hydrogen gas. BiOBr was chosen as the main catalytic phase and was used in association with a phosphor, SrAl2O4:Eu2+,Dy3+ (SAED), and a metal–organic framework, Ni-BDC. Their immobilization was realized thanks to polydopamine (PDA), which is used as a coupling agent. While BiOBr was the most active photocatalytic phase, the phosphor acted as a light-storing component for photodegradation in the dark and overall, as a boost for photoactivity. PDA also boosted the photoactivity, in parallel with its crucial role in the immobilization of the SAED/Ni-MOF/BiOBr catalyst on fractal polymer support. An in situ complexation-assisted precipitation (ISCAP) process was used, allowing the formation of the catalytic phases with nano features. The resulting hybrid photocatalysts were tested through rhodamine B (RhB) dye photodegradation upon visible light irradiation or light/dark alternating conditions to simulate more realistic variable light illumination. We found that, although used in a very small amount, the Ni-MOF had a significant impact on the photoactivity, forming a Z-scheme heterojunction with BiOBr. Finally, H2 evolution testing further established the photocatalytic activity and versatility of the supported catalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）