JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Rui-Qi Su,Qiang-Qiang Zhu,Hang Mei,Shuangqiang Fang,Yue Zhai,Pei Liang,Hong Zhang,Le Wang
Nitride red-emitting materials exhibit severe luminance saturation and are thus not suitable for achieving enhanced color rendering in laser lighting applications. The silicate luminescent material (Sr,Ba) 3 SiO 5 :Eu 2+ displays excellent stability and can emit orange-red light when excited by blue laser light, making it a promising candidate for realizing high-performance laser lighting. In this study, (Sr,Ba) 3 SiO 5 :Eu 2+ phosphor-in-glass (PiG) films were prepared on a sapphire substrate, and the influences of preparation temperature, mass ratio of phosphor to glass frit (PtG ratio), and film thickness on the application performance of PiG film were analyzed. The (Sr,Ba) 3 SiO 5 :Eu 2+ PiG film with a PtG ratio of 1:1 and a film thickness of ∼50 μm prepared at 475 °C exhibited optimal comprehensive luminescence performance. This film exhibited a luminous saturation threshold of 5.98 W/mm 2 , a maximum luminous flux of 372.3 lm, and a luminous efficiency of 62.3 lm/W at the luminous saturation threshold. The maximum luminous flux of the (Sr,Ba) 3 SiO 5 :Eu 2+ PiG film was 77.6% higher than that of the CaAlSiN 3 :Eu 2+ nitride PiG film. Finally, through the incorporation of green-emitting YAGG:Ce 3+ phosphor into the (Sr,Ba) 3 SiO 5 :Eu 2+ PiG film, laser-driven white light with a luminous flux of 531.7 lm and a high color rendering index (CRI) of 83.4 was realized.
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
Journal of Materials Chemistry C
·
2023
·
IF 6.4
Tianqi Zhao,Renagul Abdurahman,Qianting Yang,Ruxiangul Aiwaili,Xue-Bo Yin
Herein, we designed and prepared the persistent luminescence nanoparticles (PLNPs) of γ-Ga2O3:Cr,Ba rationally with Cr ions to achieve the near-infrared (NIR) emission at 700 nm and Ba ions to improve the emission intensity by inducing trap distribution. Energy transfer between γ-Ga2O3 and Cr ions occurs as the emission at 508 nm decreases and that at 700 nm increases along with the increased content of Cr ions. In combination with the trap depth, band gap of the host, and energy levels of Cr ions, an emission mechanism was proposed. Thus, NIR emission (700 nm), high brightness, large Stokes shift (446 nm), and long afterglow time (90 min) were achieved with the optimal γ-Ga2O3:0.0025Cr,0.0012Ba (γGCB) under excitation at 254 nm. The emission intensity of γGCB is temperature-dependent for non-contact ratiometric temperature sensing, and temperature linearity ranging from 300 to 420 K was achieved with an absolute sensitivity of 3.4% K−1. γGCB and γ-G2O3 are white under sunlight but exhibit red and green emissions under single excitation at 254 nm. Thus, Morse and binary codes are adapted to achieve encryption information transfer with the combination of γGCB and γ-G2O3. This work provides ideas for selecting a host, emission center, and trap for PLNPs with desirable properties and thus achieves extensive applications, as validated with ratiometric temperature sensing and encryption information transfer.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Rong Zhuang,Bijun Fang,Shuai Zhang,Xiaolong Lu,Jianning Ding
A series of [(Ba (1-0.3y) Ca 0.3y ) 1-x Sm x ][Ti (0.8+0.2y) Hf (0.2-0.2y) ]O 3 (Sm 3+ -doped (1-y)Ba(Ti 0.8 Hf 0.2 )O 3 -y(Ba 0.7 Ca 0.3 )TiO 3 , abbreviated as Sm 3+ -doped BCTH, or (1-y)BHT-yBCT:xSm 3+ , x = 0.0005–0.03, y = 0.2–0.7, y representing the mole fraction of (Ba 0.7 Ca 0.3 )TiO 3 ) nano phosphors were prepared by a hydrothermal method . The Sm 3+ ions doping amount and triple-point morphotropic phase boundary (TMPB) composition dependent photoluminescence properties were systematically investigated. The hydrothermal synthesized powders present rather pure pseudo-cubic perovskite phase structure at room temperature and locate on the rhombohedral side of MPB. Under the excitation of 409 nm light, the powders exhibit dominant orange-red emission peaks with characteristic emission of the Sm 3+ ions at around 564 nm, 596 nm, 644 nm, and 703 nm, relating to the transitions of 4 G 5/2 → 6 H 5/2 , 6 H 7/2 , 6 H 9/2 and 6 H 11/2 , respectively. The BHT-0.5BCT:0.005Sm 3+ powder exhibits optimal emission in these Sm 3+ -doped BCTH powders. Furthermore, the phase transition temperature can be characterized by the multi-feature changes of the temperature dependent fluorescence intensity.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 10
·5561-5569
·
IF 2.097
Shao Tantan,Gong Yilu,Chen Xiaolong,Chen Lijun
Novel self-crosslinking long fluorocarbon acrylate polymer latex has been successfully prepared by semi-continuous seeded emulsion polymerization with methyl methacrylate(MMA), butyl acrylate (BA), dodecafluoroheptyl methacrylate (DFMA) and hydroxypropyl methacrylate(HPMA) as main monomers, 10-undecylenic acid (10-UA) and diallyl phthalate (DAP) as functional monomers. During the latex polymerization, the monomers were emulsified by the mixed surfactants of nonionic surfactant alcohol ether glycoside (AEG) and anionic surfactant sodium dodecylbenzene sulfonate (SDBS), and initiated by potassium persulfate (KPS). The resultant latex showed excellent properties. The chemical composition of latex was determined with Fourier transform infrared spectrum (FTIR) and the glass transition temperature (Tg) of polymer was detected by differential scanning calorimetry (DSC) and the water repellency of the prepared film was measured by water contact angle measurement (WCA). The reaction conditions were optimized and obtained as follows: the optimal monomer dosage was MMA: BA: DFMA: HPMA = 12.75:12.75:0.9:1.2, the amount of 10-UA and DAP was both 4% of all monomers, the dosage of AEG: SDBS was 5% (1:1) and KPS was 0.5%, respectively. The result indicated that the conversion of the mixed monomers was more than 98% and the coagulation was less than 1% and the resultant latex also had the outstanding appearance and latex performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xinyu Chen,Xinyu liu,Taotao Ai,Qian Qiu,Minghui Hao,Yang He,Minghui He,Haoyu Wang,Chunlin Song,Daniel Q. Tan,Gang Liu,Yan Yan
Herein, a series of lead-free ceramics, (1− x )(0.78Bi 0.5 Na 0.5 TiO 3 –0.22SrTiO 3 )– x Ba(Zr 0.5 Ti 0.5 )O 3 (abbreviated as BNST–BZT), were synthesized via the conventional solid-state reaction approach. The effects of introducing the BZT component on the electromechanical transformation properties and phase transition of BNST were thoroughly investigated, leading to the development of a corresponding phase diagram. The addition of BZT significantly influenced phase transitions and domain structures, with phase coexistence involving ferroelectric rhombohedral and relaxor tetragonal phases. XRD analysis and temperature-dependent measurements of dielectric and ferroelectric properties demonstrated that the relaxor phase content could be modulated by adjusting the BZT content and varying the temperature. Domain changes were also observed through PFM testing. With the addition of BZT, the RE-FE phase transition temperature T F-R is successfully adjusted to near room temperature, accompanied by the disruption of long-range ferroelectric domains and the formation of polar nanoregions. This transition marks a shift from NR to ER state. Specifically, with an optimized BZT content of 0.006, the material demonstrates a significant strain of 0.41 % under a 70 kV/cm and achieves a maximum normalized strain of 715 p.m./V at 50 kV/cm. This research introduces an effective doping strategy that offers valuable insights into the design and development of high-performance lead-free ceramics. Additionally, it investigates the mechanisms underlying the observed high strain responses, highlighting their potential application in lead-free piezoelectric actuators.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Hua Yu,Bingxue Yao,Degang Deng,Leifeng Chen,Hongting Zhao,Yinqun Li,Youjie Hua,Shiqing Xu
A novel tunable red to yellow emitting phosphor, (Ca, Ba) 4 (PO 4 ) 2 O:Eu 2+ is reported that displays a broad emission from 500 to 800 nm, and its emitting color can be adjusted from red to yellow by changing Ba 2+ doping concentration. X-ray powder diffraction (XRD) analysis confirmed the phase formation. Excitation and emission spectra, and concentration dependence of emission intensity of the phosphor were investigated. The results showed that the emission peak wavelength take blue-shifted from 640 to 545 nm and the color hue can be tuned from red to yellow with increasing Ba 2+ concentration. When single-phase (Ca 3.85 Ba 0.10 )(PO 4 ) 2 O:0.05Eu 2+ phosphor is pumped by a blue InGaN light-emitting diode, we obtain white light with color rending index ( R a ) between 84.0 and 90.6 and color temperatures between 4000 and 5500 K, which suggests that this material is competitive as a color conversion material for solid state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Lizhu He,Zhen Song,Xionghui Jia,Zhiguo Xia,Quanlin Liu
T-phase (Ba,Ca)2SiO4:Eu2+, showing excellent luminescent thermal stability, has a positionally disordered structure with the splitting of five atom sites, but until now the reason has remained unclear. Herein, we investigate the coordination environments of each cation site in detail to understand the origins of the atom site splitting. We find that the three cation sites in the split-atom-site model are optimally bonded with ligand O atoms compared to the unsplit-atom-site model. This atom site splitting results in larger room and smaller room for each splitting cation site, which just accommodates larger Ba2+ ions and smaller Ca2+ ions, respectively, leading to more rigid structure. Based on the X-ray diffraction data refinement, the boundary of the T-phase for (Ba1–xCax)2SiO4 is redetermined. The Eu2+-doped T-phase (Ba,Ca)2SiO4 phosphors show excellent luminescent thermal stability, which can be attributed to optimal bonding and more rigid structure with atom site splitting. These results indicate that T-phase (Ba,Ca)2SiO4:Eu2+ phosphors have promise for practical applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Qin Cao,Ruiming Qiu,Libin Lei,Wenda Zhang,Sihao Deng,Jie Chen,Lunhua He,Jungu Xu
Tetragonal La2BaIn2O7 belongs to the stoichiometric n = 2 members of the Ruddlesden–Popper (RP) structure, with La3+ and Ba2+ cations ordered in the rock salt and octahedral layers, respectively. Herein, a series of alkaline-earth-metal-doped materials La2–xMxBaIn2O7–0.5x (M = Ca, Sr, Ba) were prepared by the traditional solid-state reaction method. The results revealed that the substitutions of Ca/Sr/Ba for La introduced oxygen vacancies and led to good oxide ion conduction, e.g., ∼1.21 × 10–3–1.38 × 10–2 S/cm within 600–900 °C for the specimen La1.7Ba1.3In2O6.85, which was more than 2 orders of magnitude higher than the parent material. However, both the parent and acceptor-doped La2BaIn2O7 showed very limited proton conductions. The energetics of defect formation and oxygen vacancy migrations in La2BaIn2O7-based materials was studied through the static lattice and molecular dynamics (MD) atomistic simulations based on the interatomic potential approach. The defect formation energy calculations for the electrons and holes in La2BaIn2O7 rationalized the experimentally observed pure ionic conduction under low pO2 and mixed ionic and p-type electronic conductions under high pO2, respectively. The MD simulations indicated two-dimensional oxygen vacancy migration within the perovskite slab for the acceptor-doped La2BaIn2O7.
研究领域:
材料科学
·
固体离子学
·
计算材料物理
·
陶瓷材料
·
能源材料
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Lu Qi,Zhaohui Chen,Xuerui Shi,Xiaodong Zhang,Qun Jing,Na Li,Zhongqi Jiang,Bingbing Zhang,Ming-Hsien Lee
Exploring novel photoelectric functional materials via chemical substitution-oriented design is an effective strategy, which can be expanded to the discovery of high-performance UV nonlinear optical (NLO) materials. Two new NLO pyrophosphates, Rb3BaBi(P2O7)2 (I) and Cs3BaBi(P2O7)2 (II), are rationally developed by a cation substitution technique based on A3PbBi(P2O7)2 (A = Rb and Cs), of which I inherits the large second-harmonic generation (SHG) response (exptl 2.5 × KDP; calcd 2.9 × KDP) and moderate birefringence (0.025@1064 nm) accompanied by a broadened UV transparent region. Compounds I and II are isomeric and exhibit different Ba–P–O frameworks. Especially, I possesses a large SHG effect benefiting from the favorable pentagonal-net topological structure. Detailed theory calculations elucidate the origin of the linear and nonlinear optical properties of the compounds. The insights obtained from the atomic-level module adjustment involving lone-pair-active optical anisotropy are useful for designing more efficient UV NLO materials.
研究领域:
材料科学
·
非线性光学
·
无机化学
·
晶体工程
·
计算材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Mingsheng Cai,Tianchun Lang,Shuangqiang Fang,Tao Han,Damir Valiev,Houjiang You,Chong Liu,Jing Yu,Peng Su,Xiaolong Jing,Guanghui Ge,Bitao Liu,Elena F. Polisadova
Fluorescent materials are widely used for anti-counterfeiting of information security and commodities. However, the increasing requirements for fluorescent anti-counterfeiting technology urgently require the development of novel fluorescent materials with multicolor fluorescence, single component, and excellent stability. Herein, a color tunable Ba 0·94 Ca 0.06 ScO 2 F: Eu 2+ , Bi 3+ , K + perovskite with dependence of excitation wavelength for high-level anti-counterfeiting is reported. The fluorescence spectra of Ba 0·94 Ca 0.06 ScO 2 F: Eu 2+ , Bi 3+ , K + perovskite show the tunable emission band with the peak between 479 and 509 nm. It is worth noting that the peak intensity ratio at 479 and 509 nm changes with the dependence of the excitation wavelength. Meanwhile, the snowflake pattern is designed to demonstrate the potential applications in anti-counterfeiting, which obviously shows four different color patterns under the sunlight, 320 360, and 415 nm excitation, respectively.
研究领域:
材料科学
·
光学材料
·
防伪技术
·
发光学
·
光子学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Lingwei Lu,Shuang Ni,Gang Liu,Xiaoxiang Xu
The crystal structure of a photocatalyst generally plays a pivotal role in its electronic structure and catalytic properties . In this work, we synthesized a series of La/Cr co-doped perovskite compounds ATiO 3 (M = Ca, Sr and Ba) via a hydrothermal method . Their optical properties and photocatalytic activities were systematically explored from the viewpoint of their dependence on structural variations, i.e. impact of bond length and bond angles. Our results show that although La/Cr co-doping helps to improve the visible light absorption and photocatalytic activity of these wide band gap semiconductors , their light absorbance and catalytic performance are strongly governed by the Ti O bond length and Ti O Ti bond angle. A long Ti O bond and deviation of Ti O Ti bond angle away from 180° deteriorate the visible light absorption and photocatalytic activity. The best photocatalytic activity belongs to Sr 0.9 La 0.1 Ti 0.9 Cr 0.1 O 3 with an average hydrogen production rate ∼2.88 μmol/h under visible light illumination (λ ≥ 400 nm), corresponding to apparent quantum efficiency ∼ 0.07%. This study highlights an effective way in tailoring the light absorption and photocatalytic properties of perovskite compounds by modifying cations in the A site.
研究领域:
材料科学
·
物理化学
·
能源化学
·
无机化学
·
光催化
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Yan Liu,Haoqing Lin,Jingnan Zou,Tenghui Yuan,Zhuohao Wang,Hang Bao,Ali Abdelhafiz,Bote Zhao
Protonic ceramic electrochemical cells (PCECs) are promising for renewable energy conversion, yet their commercialization is hindered by the limited durability and thermal expansion mismatch of commonly used Co-based air electrodes. Although Fe-based alternatives offer better thermal compatibility, they suffer from inferior oxygen reduction kinetics. Herein, we report a surface decoration strategy to address these challenges by decorating a Ba-enriched Ba1.02FeO3−δ (B1.02F) scaffold with a Co-based catalyst coating. Electron microscopy and spectroscopic characterization confirm the formation of a composite surface coating comprising Co3O4 and in situ formed Ba–Co–O species. The resulting catalyst-coated B1.02F electrode (B1.02F-CC) effectively combines the thermomechanical robustness of the Fe-based backbone with the high catalytic activity of Co species. Electrochemical analyses reveal that the catalyst coating markedly accelerates both oxygen surface exchange and charge-transfer kinetics. Consequently, single cells based on the B1.02F-CC electrode deliver a maximum power density of 1.46 W cm−2 and sustain stable operation for 600 h at 650 °C. Additionally, the single cell maintains reliable performance for 17 thermal cycles (300–650 °C) with negligible degradation. This work validates a robust surface decoration strategy to reconcile the trade-off between electrocatalytic activity and thermomechanical stability, providing a viable pathway toward durable, high-performance air electrodes for PCECs.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）