Materials Today Chemistry
·
2021
·
IF 8.301
Zongjie Zhang,Balaji Devakumar,Shaoying Wang,Liangling Sun,Nan Ma,Wei Li,Xiaoyong Huang
White light-emitting diodes (LEDs) with high color rendering index (CRI) and low correlated color temperature (CCT) are desirable for next-generation solid-state lighting. In this work, we demonstrated an efficient near-UV-excited cyan-emitting phosphor based on Ce 3+ -doped Ca 2 LuHf 2 Al 3 O 12 (CLHAO) garnet , which could be used to cover the cyan gap for fabricating high-CRI warm-white LEDs. We found that the CLHAO:Ce 3+ samples exhibited a broad excitation band in the 300–450 nm wavelength range peaking at 400 nm, and upon 400 nm excitation they showed broad cyan emission bands in the 420–600 nm spectral region with peak positions ranging from 477 to 493 nm. The optimal CLHAO:0.02Ce 3+ sample had CIE color coordinates of (0.160, 0.255), and its internal and external quantum efficiencies were measured to be 84.3% and 60.8%, respectively. Impressively, the luminescence intensity of CLHAO:0.02Ce 3+ sample at 423 K still remained at 62% of the initial value at 303 K, and the chromaticity shift was calculated to be as low as 1.7 × 10 −2 , revealing its high thermal stability and color stability at a higher temperature. Finally, a warm-white LED device (CCT = 3,194 K) was fabricated by combining CLHAO:0.02Ce 3+ cyan phosphors with commercial blue/green/red tricolor phosphors, showing bright white-light emission with a high CRI of 89.4, which was superior to that of another warm-white LED device (CRI = 83.2) fabricated without CLHAO:0.02Ce 3+ cyan phosphors. These outstanding luminescence properties of CLHAO:Ce 3+ cyan phosphors illustrated that they offer a new feasible approach for the production of high-CRI warm-white LEDs toward high-color-quality solid-state lighting.
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 Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiangyu Wang,Yiming Wang,Jun Ma,Ping Ning
The wide band gap of g-C 3 N 4 and severe aggregation of Fe 0 adequately limit their applications. To address these two critical issues, novel ternary phosphorus-doped g-C 3 N 4 /Fe 0 @expanded graphite carbon layer (P-CN/Fe 0 @EGC) photocatalyst with extremely narrow band gap and significantly enhanced catalytic activity was in-situ synthesized. P-CN/Fe 0 @EGC hybrid composite exhibited excellent photodegradation performance of tetracycline (TC) removal, which is 5.18 and 1.92 times higher than that of pristine g-C 3 N 4 and Fe 0 , respectively. Enhancement in photocatalytic activity is evaluated via photoluminescence (PL), UV–vis DRS, XRD and electron spin resonance (ESR). A reasonable catalytic mechanism of P-CN/Fe 0 @EGC is proposed. The multiply synergistic mechanisms of phosphorus-doped g-C 3 N 4 (P-CN), Fe 0 and expanded graphite carbon layer (EGC), as well as the strong reducibility of Fe 0 were accounted for the expanded visible light absorption range. The even dispersion of Fe 0 on porous and worm-like structured P-CN/EGC effectively and successfully avoided the decline in photocatalytic activity caused by aggregation of Fe 0 nanoparticles . Compared with g-C 3 N 4 , the band gap of phosphorus-doped g-C 3 N 4 was narrowed from 2.79 to 2.60 eV. It is worth noting that Fe 0 plays an important role in accelerating electron transfer speed and efficiency between P-CN and EGC. The·O 2 − and h + were the dominant active substances for TC degradation . Moreover, P-CN/Fe 0 @EGC catalyst could be used repeatedly for at least 7 cycles with high TC removal efficiency. This study may pave a new way on designing high efficient ternary hybrid photocatalyst for antibiotic degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Kai Jia,Lunshuai Nie,Yixi Guo,Xiujun Deng,Zhehui Weng,Yizhou Li,Haidong Ju
Phosphors with simple preparation, high luminous efficiency and excellent thermal stability are highly desirable for commercial white light-emitting diodes (W-LED). In the paper, a new garnet-type green phosphor LuMgAl 5 SiO 12 :Ce 3+ (LMASO:Ce 3+ ) has been successfully prepared by a high-temperature solid-state reaction. The crystal structure and photoluminescence properties were investigated in detail. X-ray diffraction and the Rietveld refinement demonstrated the crystal structure of LMASO belongs to cubic systems with an Ia 3 ¯ d (2 3 0) space group. The unit cell parameters of LMASO:0.08Ce 3+ phosphor were found to be a = 11.90418 Å and V = 1686.935 Å 3 . LMASO:Ce 3+ phosphors have two excitation bands with peaks at 340 and 436 nm, attributed to the 4f → 5d transition of Ce 3+ ions. Under excitation at 436 nm, LMASO:0.08Ce 3+ phosphor exhibits a broad and asymmetric emission band in the 450–700 nm range. Notably, a W-LED device was created by combining a 455 nm blue LED chip with the obtained green sample and the commercially available red CaAlSiN 3 :Eu 3+ phosphor. The device emitted a bright warm white light with a low correlated color temperature of 3584 K and a high color rendering index of 96.0 at a drive current of 40 mA. The article indicates that LMASO:Ce 3+ samples can serve as a potential green phosphor for W-LEDs, and offers a new strategy for designing efficient phosphors.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Pingan Tan,Xiaoyan Zhong,Jingsong Liu,Fei Yang,Chong Xian,Honglan Yuan
Ni 0.6 Zn 0.4 Fe 2 O 4 (NZF-Zn 0.4 ) ferrites with different Al–Si–B–Pb (ASBP) glass additions were synthesized via a solid-phase reaction method at 1175 °C. The inclusion of ASBP-glass significantly enhances the grain size, density, shrinkage, and magnetic properties of NZF-Zn 0.4 ferrites without introducing impurity phases. The prepared NZF-Zn 0.4 -1 wt%ASBP ferrites not only exhibit appropriate radial shrinkage but also possess a dense microstructure and outstanding magnetic properties. Subsequently, Y 2.4 Bi 0.5 Al 0.1 Fe 3 O 4 (YIG-Al 0.1 ) ferrites and NZF-Zn 0.4 -1 wt%ASBP ferrites were chosen as the outer rings and inner cores, respectively. Tightly interconnected YIG-Al 0.1 /NZF-Zn 0.4 –1wt.% ASBP ferrite composite substrates were successfully co-fired within the temperature range of 1175 °C–1225 °C following co-pressing. Furthermore, YIG-Al 0.1 /NZF-Zn 0.4 -1 wt%ASBP composite substrates, co-fired at 1175 °C, exhibit a lack of impurity phases in the interface region, minimal element diffusion, and exceptional electromagnetic properties (NZF-Zn 0.4 -1 wt%ASBP: M s = 81.88 ± 0.05 emu/g; YIG-Al 0.1 : ε r = 18.28 ± 0.05@11.17 GHz, tanδ = 3.14 ± 0.55 × 10 −4 , M s = 21.62 ± 0.55 emu/g). The wide co-firing temperature range of YIG-Al 0.1 /NZF-Zn 0.4 -1 wt%ASBP composite substrates significantly enhances the shrinkage matching rate of two-phase ferrites, and its exceptional electromagnetic properties hold significant potential for applications in RF band circulators.
研究领域:
材料科学
·
磁性材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Luheng Wang,Li Xu,Xisi Long
In the confined, curved spaces of high-precision equipment, single-function sensors cannot monitor multiple parameters like gas concentration and gap. This study prepared an eddyingized sensor based on flexible thermoplastic polyurethane (TPU) fibers for the detection of ammonia concentration and gap, by optimizing the compounding ratio of dodecylbenzenesulfonic acid-doped polyaniline (DBSA-PANI) and carboxylated multi-walled carbon nanotubes (MWCNT-COOH). The TPU-MWCNT-PANI-0.1 sensor enables the detection of ammonia within the concentration range of 0–30 ppm, with a relative resistance change of 11.62% at 30 ppm and good selectivity. The response and recovery time to 24 ppm NH 3 are 21 s and 240 s, respectively. For gap detection (0–5 mm), the maximum sensitivities are 0.2619 mm −1 (impedance magnitude) and 0.1095 mm −1 (impedance angle) within the 1–0 mm range. The repeatability and stability of the sensor are evaluated: after 20 cycles in 24 ppm NH 3 , the relative standard deviations (RSD) for the relative change in resistance, impedance magnitude, and angle are 0.59%, 1.16%, and 1.38%, respectively. Over 30 repeated gap tests (0–5 mm), the RSD for the relative change in impedance magnitude and angle are 0.13% and 0.32%, respectively. A 31-day test confirms long-term stability, with all RSD below 2.28% for NH 3 tests and 0.08% for gap tests. The sensor also maintains mechanical stability after eight bending cycles at 30°, 60°, and 90°. A signal-separation strategy using direct current resistance and alternating current impedance enables dual-parameter detection of ammonia (0–30 ppm) and gap (0–5 mm), providing a simple and reliable solution.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 32
·24944-24952
·
IF 3.84
Xinshan Rong,Fengxian Qiu,Jie Yan,Hao Zhao,Xiaolu Zhu,Dongya Yang
A coupled system for the photodegradation of Rhodamine B dye was realized using a Bi2S3/g-C3N4 composite as a photocatalyst under visible light irradiation. The Bi2S3/g-C3N4 composite was prepared by a hydrothermal method and characterized by Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Compared with pure g-C3N4, the Bi2S3/g-C3N4 sample exhibits an enhanced photocatalytic activity and the best photocatalytic efficiency is 3.68 times more than that of pure g-C3N4. The obtained results indicate that a coupled system of Bi2S3 and g-C3N4 could overcome the drawback of low photocatalytic efficiency brought by electron–hole recombination and a narrow photoresponse range. On the basis of the corresponding energy band positions, the mechanism of photocatalytic activity enhancement was proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2014
·
IF 4.287
Tao Luo,Min He,Chao Gao,Jin-Huai Liu,Xing-Jiu Huang
A novel specific size-matching strategy for electrochemical selective and sensitive detection of Hg(II) has been designed based on a porous Au–thiol metal–organic coordination polymer. The sensitivity and limit of detection reach 0.075 μA nM − 1 and 12 nM, respectively. The mechanism of detection is assumed that Hg(II) ions are deposited into the three-dimensional (3D)-gap and form a contact among the Au metal, which triggers an electrochemical response.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Lin Liu,Shanshan Peng,Lei Fu,Yuxuan Guo,Xia Sun,Liang Song,Junpeng Shi,Yun Zhang
Since the strong blue light from the conventional blue chip has negative effects on human health, near-ultraviolet (n-UV) white light-emitting diodes (W-LEDs) have been widely studied. However, the photoluminescence spectrum generated by tricolor (blue, green, and red) phosphors contains a notable cavity in the deep-blue region (400–430 nm), which reduces the color quality. In this work, we report a novel series of narrow-band deep-blue-emitting phosphors with strong n-UV excitation, Ln2Si2O7:Bi3+ (Ln = Gd, Y, Lu, Sc), and realize the tuning of emission from 422 to 403 nm via cationic substitution, which bridges the deep-blue gap. All of these phosphors are effectively excited by n-UV radiation at approximately 370 nm and exhibit narrow-band deep-blue emission with a full width at half-maximum (FWHM) < 50 nm. Among them, Sc2Si2O7:Bi3+ generates 403 nm deep-blue emission with a 38 nm FWHM under 372 nm n-UV excitation, with high luminescence intensity and excellent thermal stability. Finally, 365 nm n-UV-pumped phosphor-converted (pc) W-LED devices are fabricated by combining Sc2Si2O7:Bi3+ and commercially available phosphors, and they have a high color-rendering index (Ra) of 95.4 and a low correlated color temperature (CCT) of 3736 K. This result suggests that these phosphors have potential applications in full-spectrum warm white lighting.
研究领域:
材料科学
·
光学工程
·
照明技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Wen-Jing Chen,Xiao-Qing Liu,Shun Zhang,Hong Jiang
The synthesis of new surface-enhanced Raman scattering (SERS) substrates for the detection of trace poisonous organic pollutants is important for environmental monitoring. Herein, we designed and prepared monodispersed and uniform Ag NPs anchored on silica microspheres (Ag@ASMs) by the orientation of grafted amino groups and applied it as a SERS substrate for the detection of ultralow concentrations of poisonous organic pollutants (Rhodamine 6G (R6G), crystal violet (CV), and melamine) with high sensitivity and reproducibility in aqueous solution. A ratio of 2:1 Ag@ASMs exhibited optimum SERS performance, allowing the detection of 10–12 M of R6G with an enhancement factor of 6.36 × 107 (collect the normal Raman signal based on 10–4 M R6G) as well as 10–8 M of CV and melamine. The density functional theory calculation also provided evidence that modified 3-triethoxysilylpropylamine molecules are interspaced, and the optimum Ag dosage further tuned the gap between Ag NPs as well as the size of Ag NPs. This approach can suggest new ideas for the design and synthesis of other improved SERS-active substrates.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Cheng Chen,Danyang Dou,Yunjie Bai,Bingbing Zhang,Ying Wang
The investigation of birefringent materials is predominantly focused on π-conjugated systems; however, a large band gap or deep ultraviolet (DUV) transmittance cannot be guaranteed. In this work, we propose an extended π-conjugated strategy to increase the birefringence while keeping the large band gap. In the scheme, two new fluoroaluminoborates, BaAlB3O6F2 and BaAl2(B3O6)2F2, are synthesized by combining the [BO3] group with the [AlO4F2] group and the [B3O6] group with the [AlO3F] group through a rational structural design. The experimental results indicate that both BaAlB3O6F2 and BaAl2(B3O6)2F2 exhibit shorter UV cutoff wavelengths (<200 nm) and larger birefringence (Δn > 0.07@546 nm). Notably, this is a new finding in the Ba–Al–B–O–F system since the discovery of the well-known nonlinear optical crystal BaAlBO3F2. In comparison with BaAlBO3F2, BaAlB3O6F2 and BaAl2(B3O6)2F2 exhibit a markedly elevated birefringence (0.0418 vs. 0.087/0.105 at 546 nm). Furthermore, BaAl2(B3O6)2F2 exhibits the largest band gap (7.87 eV) of all known F-containing aluminoborates. This work not only identifies two potential DUV birefringent materials, but also proposes a novel design approach for reconciling the conflicting properties between birefringence and bandgap.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 35
·13944-13950
·
IF 4.177
Gang Yan,Hongfei Shi,Huaqiao Tan,Wanbin Zhu,Yonghui Wang,Hongying Zang,Yangguang Li
A series of 2D sheet Bi2OxS3−x/Nb6O17 (Bi/Nb) heterostructure photocatalysts were synthesized through a facile hydrothermal vulcanization method between Bi3+ exchanged K4Nb6O17 and thiourea (NH2CSNH2). XRD results confirm that the heterostructures were composed of Bi2OxS3−x and Nb6O17. HRTEM indicates that Bi2OxS3−x was successfully intercalated into layers of K4Nb6O17. Such large interfacial contacts can be beneficial to the transfer and separation of photogenerated charge carriers. Thus the composites exhibit good photocatalytic performance for the degradation of methyl orange (MO) under visible light irradiation (λ > 400 nm), which is superior to that of both precursors, pure Bi2S3 and K4Nb6O17. Radical capture tests reveal that photogenerated holes h+ and ˙O2− play important roles in the photodegradation of MO. And based on the UV-visible diffuse reflectance spectra (DRS) and the band gap of the semiconductors, the mechanism of the enhanced visible light photocatalytic activity of these composites has been proposed.
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
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengmeng Zhu,Junbo Wang,Lei Hou,Yiwen Yuan,Lili Liu,Yaoqing Chu,Chunmei Huang
The design and syntheses of new birefringent crystals will be of great importance in commercial applications and materials science. A series of ultraviolet (UV) birefringent crystals, AX·(H2SeO3)n (A = K, Cs; X = Cl, Br; n = 1, 2), with large sizes up to 23 × 6 × 3 mm3, was successfully synthesized by simple aqueous solution method. These four compounds belong to three different space groups. Isomorphic KCl·(H2SeO3)2 and CsCl·(H2SeO3)2 crystallize in the P1¯ space group, while CsBr·(H2SeO3)2 and CsCl·H2SeO3 crystallize in the P21/m and P21/c space groups, respectively. They exhibit cocrystal structures composed of [2(H2SeO3)]∞ and [AX]∞ frameworks, ingeniously inheriting the large optical anisotropy of selenite and the wide band gap of alkali metal halide. And it proves that these compounds indeed possess large birefringence (0.1–0.17 at 532 nm) and short UV cutoff edges (227–239 nm), achieving a balance of optical properties. This research affords a simple and viable strategy for the design and syntheses of new UV birefringent crystals. Besides, it is also found that the n value and ionic size (A and X ions) have important influences on the crystal structures and optical properties of AX·(H2SeO3)n. And this will promote further understanding of the alkali metal halide selenite family.
研究领域:
材料科学
·
晶体工程
·
光学材料
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）