JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Biao Xu,Zihao Xu,Chunyu Li,Jian Peng,Xingyu Li,Wubin Dai
Phosphor with thermally stable and highly efficient photoluminescence (PL) is a premise/challenge for use in high-quality phosphor-converted light-emitting diodes (pc-LEDs). Herein, via a facile solid-phase sintering method in air, a negative thermal quenching (TQ) blue emitting SrGa 2 B 2 O 7 (SGB): Bi is reported, mainly associating with the underlying collaborative effect of negative volumetric thermal expansion of rigid host, heterovalent substitution (Bi 3+ → Sr 2+ )-induced V Sr /V O vacancies, and generating self-reduction ions (Bi 2+ ). For charge balance under the condition of temperature rising, both opposite process of self-oxidation (Bi 2+ to Bi 3+ ) and charge release from trap levels can compensate blue-PL loss. This phosphor is comparable to Eu 2+ /Ce 3+ -activated blue-emitting phosphors, and even boasts superior quantum efficiency (QE) and thermal stability. Via artificially codoping Na + for charge compensation, the QE of the SGB:Bi/Na can be further significantly enhanced. Color-tunable PL is achieved via cascade-connected energy transfer (ET) from Bi 3+ to Tb 3+ (green)/Eu 3+ (red) in SGB: Bi/Na/Tb/Eu that possesses high QE/stability than the case of blue/green/red tricolor phosphor blends adopted in warm white LEDs (wLEDs). Finally, the SGB: Bi/Na and SGB: Bi/Tb/Eu/Na are respectively, encapsulated with distinct encapsulants via either traditional or remote “capping” packaging strategy to form blue LEDs and wLEDs, showcasing splendid electroluminescence behaviors and luciferous application prospects.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yiying Yue,Jiamin Gu,Wanli Cheng,Guangping Han,Jingquan Han,Jianchun Jiang
A portable, sensitive, rapid, specific, and environment-friendly polyvinyl alcohol–borax (PB) hydrogel fluorescence probe was synthesized for the sequential sensing of Cu 2+ and oxytetracycline (OTC) in wastewater. The aminated 2,2,6,6-tetramethylpiperidinooxy-oxidized cellulose nanofibers/europium complexes/carbon dot (ATOCN/Eu(DPA) 3 /CD) complex was added to the PB matrix. With the assistance of ATOCNs, the in-situ polymerized ATOCN/Eu(DPA) 3 /CD complexes were well-dispersed in the hydrogel and enhanced the mechanical properties of the hydrogel. The prepared hydrogel could be converted from solid to liquid by adjusting the water content to reduce the deviations caused by the solid probe detection. The probe not only induced evident fluorescence quenching and instantaneous response to Cu 2+ at 430 nm and OTC at 617 nm but also exhibited a high selectivity to Cu 2+ and OTC. The detection limits for Cu 2+ and OTC were 0.031 and 0.019 mg L −1 , respectively. Fluorescence recover was achieved by adding S 2− for CuS precipitate formation and for the thermal decomposition of OTC. After repeatedly recovering the fluorescence for 10 times, the fluorescence intensity at 430 nm was restored to 79% of the original intensity and that at 617 nm was stored to 95%. The results show that hydrogels have remarkable potential applicability in detecting Cu 2+ and OTC in wastewater.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jingfang Tong,Weijie Lin,Ruixin Guo,Zhongzheng Deng,Haitao Zhou,Shu Guo,Xiaojun Kuang
Strong magnetic anisotropy in low-dimensional magnets leads to a significant rotating magnetocaloric effect, presenting new opportunities for the exploration of more efficient and streamlined refrigeration systems. In this study, we have successfully synthesized a series of centimeter-scale rare-earth-containing fluorocarbonates, K 4 RE 2 (CO 3 ) 3 F 4 ( RE = Ce, Pr, Nd, Sm, Eu, Tb, and Dy) through a supercritical hydrothermal method, featuring unique RE 2 O 12 F 4 magnetic dimers. The above materials' fundamental magnetism has been systematically investigated, and no long-range magnetic transitions were captured above 1.8 K. Based on the low-temperature specific heat results, the long-range magnetic ordering was found around 0.84 K and 0.97 K for K 4 Tb 2 (CO 3 ) 3 F 4 and K 4 Dy 2 (CO 3 ) 3 F 4 , respectively. Furthermore, the anisotropic magnetism of K 4 Tb 2 (CO 3 ) 3 F 4 and K 4 Dy 2 (CO 3 ) 3 F 4 reveals significant magneto-crystalline anisotropy, with the magnetic field ( B ) aligned along the RE 2 O 12 F 4 magnetic dimer, which acts as the easy magnetic axis. The maximum rotating field entropy change, − Δ S R max for K 4 Tb 2 (CO 3 ) 3 F 4 reaches approximately 9 J kg -1 K -1 around 17 K, while for K 4 Dy 2 (CO 3 ) 3 F 4 , it is approximately 5.5 J kg -1 K -1 near 11 K, both under a 7 T field applied along the c -axis. These findings highlight the potential of these compounds for magnetic refrigeration applications through a rotating crystallographic direction.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Physics
·
2024
·
IF 10
Jingru Wang,Jiaxin Yang,Yanyan Li,Yang Li,Rui Xu,Feng Song
The widespread application of optical encryption materials with difficult imitation, multicolor-tunable emission and simple operation presents a promising strategy for secure communication and authentication of information. Herein, Eu-MOF grafted with coumarin 7 is successfully constructed through self-assembly process and a prismatic three-dimensional hyperbranched structure is formed. At room temperature, it can be excited to by ultraviolet light significantly different green and red light emission. With the temperature rising to 363 K, under the excitation of 360 nm, a continuous and programmable color transformation occurs, resulting in a fitted line with a fitting degree of 0.99745. In order to maintain robust reliability, regular alterations in accordance with temperature variations are assessed through temperature sensitivity, and the absolute sensitivity and relative sensitivity can reach up to 6.168 % K −1 and 4.387 % K −1 . Based on the abundant emission modes, we develop an asymmetric information security authentication program to simulate encrypted information communication, which provides reliable guidance on visualized information storage and encryption.
研究领域:
光学材料
·
密码学
·
材料科学
·
化学
·
信息安全
✓ 已验证
DOI
高影响因子
Environmental Technology & Innovation
·
2025
·
IF 7.1
Yu He,Suqing Liu,Yan Zhou,Junping Wang
At present, with the development of society, different enterprises inevitably produce industrial wastewater and waste residue containing lead and copper. Therefore, there is an urgent need for a rapid and simple method to detect lead and copper in pollutants. In this paper, a metal-organic framework (MOF) doped with Eu(Ⅲ) (Eu 3+ /UiO-66-NH 2 ) was successfully prepared by one-pot hydrothermal technique. The probe is capable of detecting Pb 2+ and Cu 2+ with high sensitivity. Pb 2+ and Cu 2+ have detection ranges of 5–340 μM and 0.01–200 μM, respectively. The detection limit for Pb 2+ was as low as 1.01 μM, and the detection limit for Cu 2+ was 6.46 μM. This approach has a good detection performance when compared to the method described in the literature. It shows that the prepared sensor has great potential in the detection of actual lead and copper, and provides a practical and effective method for rapid and accurate detection of heavy metal ions.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 11
·15307-15312
·
IF 4.527
Jian Xu,Yang Yang,Zhi Jiang,Baofu Hu,Xinliang Wang,Haipeng Ji,Jian Wang,Ziquan Guo,Baoli Du,Carsten Dam-Hansen,Ole B. Jensen
To achieve high color rendering and proper color temperature, a red color converter is essential for phosphor-converted white lighting devices. CaAlSiN 3 :Eu 2+ (CASN) is a highly suitable red phosphor for white light-emitting diodes. However, it can be hardly used in high-power laser lighting due to poor thermal/chemical performance of the phosphor/silicone resin mixture. A series of all-inorganic CASN-based phosphors (e.g., composite ceramic and phosphor-in-glass) were developed to avoid the use of resin. However, new challenges emerged: none of them showed sufficient luminous efficacy (i.e., >50 lm/W) and adequate saturation-threshold (i.e., >30 W or 10 W/mm 2 ). Here, we report a facile fabrication of CASN/glass composite films using a simple and efficient blade-coating method. Upon 450 nm excitation, the resultant composite film presents a high internal quantum efficiency of ~83%, comparable to that of pristine CASN powder (~90%). When irradiated with a blue laser , the composite film shows a record high luminous efficacy of 82 lm/W. Furthermore, its saturation threshold was investigated in high power and high power density mode, respectively. When measured in high power mode, it shows a high saturation threshold over 29.7 W (1.75 W/mm 2 ), thus achieving a high luminous flux of 1576 lm; when measured in high power density mode, it shows a saturation threshold of ~10.2 W/mm 2 (1.13 W). With abovementioned excellent properties, the CASN/glass composite film has great potential for use in high-power and high color rendering laser lighting.
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Ruoqi Wang,Qiao Zhang,Lei Yu,Yue Sun,Yunwei Gao,Dazhong Shen
Pre-oxidation is a simple and effective strategy to enhance the electrochemiluminescence (ECL) of Au nanoclusters. But the pre-oxidation ECL enhancement mechanism is still not clear. Herein, an in-situ formation immobilized coreactant promoters mechanism was proposed and verified by using Eu-doping methionine-stabilized Au nanoclusters (Met-AuEuNCs) as the model, with the ECL intensity 3.72-fold of that of Met-AuNCs. The ECL of Met-AuEuNCs was further enhanced 24.3-fold via pre-oxidation in 100 mM triethanolamine (TEOA) at the potential step of 1.0 V for 60 s, obtained a high ECL quantum yield of 143 %. The pre-oxidized Met-AuEuNCs reserved 20.1-fold ECL enhancement ratio after storing for 12 h and generated intense self-ECL in the absence of coreactant. Immobilized coreactant and coreactant promoters were formed in situ during pre-oxidation stage and enhanced the ECL of Au nanoclusters. A low potential step (e.g., 0 V, 5 s) was useful to activate the immobilized coreactant promoters for higher ECL enhancement ratio. The pre-oxidation enhancement strategy is valid only in the presence of anodic coreactants and Au nanoclusters. The pre-oxidation mechanism was applied in molecularly imprinted polymer (MIP) based ECL sensor, using neuron specific enolase (NSE) as the model analyte, with the detection limit of 6.3 fg mL −1 . The re-binding of the MIP film to NSE blocked the accesses between Met-AuEuNCs and TEOA in the pre-oxidation, activation and ECL measurement, decreased the ECL of Met-AuEuNCs. The pre-oxidized MIP-ECL sensor offered higher sensitivity than that in normal MIP-ECL mode without pre-oxidation and activation treatments.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Zhan-Ping Qiao,Meng-Yao Su,Yuan-Lin Dang,Qi-Chao Yang
The phase diagrams of the Mg(NO 3 ) 2 –Ln(NO 3 ) 3 (Ln = Nd, Sm, Eu, Tb)–HNO 3 –H 2 O systems in the (∼20%) HNO 3 regions at T = 298.15 K were determined by using an isothermal solution saturation method. The Schreinemaker’s wet residues method was used to determine the compositions of solid-phases. Both Mg(NO 3 ) 2 –Nd(NO 3 ) 3 –HNO 3 –H 2 O and Mg(NO 3 ) 2 –Sm(NO 3 ) 3 –HNO 3 –H 2 O systems are complicated with three equilibrium solid phases Mg(NO 3 ) 2 ·6H 2 O, Mg 3 Ln 2 (NO 3 ) 12 ·24H 2 O and Ln(NO 3 ) 3 ·6H 2 O (Ln = Nd, Sm). But the systems Mg(NO 3 ) 2 –Eu(NO 3 ) 3 –HNO 3 –H 2 O and Mg(NO 3 ) 2 –Tb(NO 3 ) 3 Tb–HNO 3 –H 2 O are simple eutonic type. The two new solid-phase compounds Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O and Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O are congruently soluble in an average medium of ∼20 mass % HNO 3 , and they were identified and characterized by the methods of powder X-ray diffraction, X–ray diffraction single crystal structure analysis, and thermogravimetric/differential thermogravimetric. The XRD diffraction patterns for the two new solid-phase compounds are identical due to their isomorphic structure. They belong to hexagonal systems, with space group R 3 . For Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O, a = b = (1.0993 ± 0.0005) nm, c = (1.7211 ± 0.0007) nm, V = (1.8012 ± 0.0013) nm 3 , D c = (4.2532 ± 0.0024) g·cm −3 , Z = 3; for Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O, ( a = b = 1.1198 ± 0.0004) nm, c = (1.7257 ± 0.0006) nm, V = (1.8742 ± 0.0011) nm 3 , D c = (4.1201 ± 0.0012) g cm −3 , Z = 3. The standard molar enthalpies of solution of the compounds Mg 3 Nd 2 (NO 3 ) 12 ·24H 2 O and Mg 3 Sm 2 (NO 3 ) 12 ·24H 2 O in water (aq) were measured to be (101.26 ± 0.77) kJ mol −1 and (80.27 ± 0.81) kJ mol −1 , and their standard molar enthalpies of formation were calculated to be – (12214.13 ± 2.5) kJ mol −1 and – (12183.6 ± 2.5) kJ mol −1 , respectively.
研究领域:
化学
·
物理化学
·
材料科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Chenyang Zhan,Zihao Wang,Sisi Liang,Zhi-Ying Zhao,Hanru Chen,Jiahe Yu,Haomiao Zhu
Alkaline earth lithoaluminates with the UCr4C4-type structure have demonstrated considerable potential in achieving narrow-band emissions from Eu 2+ . However, obtaining single-phase powder samples with green-emitting remains challenging. In this study, we address this issue by co-doping Ba 2+ into the novel UCr4C4-type system Sr5/6-xBaxLi17/6Al7/6O4:Eu 2+ , which significantly enhances phase purity and structural homogeneity. This approach not only reduces the emission bandwidth from 66 nm (2241 cm -1 ) to 51 nm (1830 cm -1 ) but also induces a blue shift to 529 nm, fine-tuning the emission into the desired deep green region. Through detailed mechanistic studies-including low-temperature spectroscopy and luminescence decay analysis-we identify the presence of multiple Eu 2+ emission centers associated with distinct Sr 2+ sites. Ba 2+ doping is shown to promote dominant Eu 2+ emission in the green spectral region, thereby facilitating spectral narrowing.The optimized phosphor achieves a high absorption efficiency of 64.6% and an external quantum yield of 22.2%. When integrated into a white LED prototype, it enables a color gamut covering 97.6% of the NTSC (National Television System Committee) standard, outperforming a commercial β-SiAlON:Eu 2+ -based device. This study provides an effective cationic codoping strategy for designing high-performance narrow-band oxide phosphors and highlights a promising candidate for nextgeneration display technologies.
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6716
·
IF 3.623
Shiyu Ma,Yan Lu,Bo Wang,Jinkai Li
White LEDs were encapsulated using Cs4PbBr6quantum dots and Gd2O3:Eu red phosphor as lamp powder. Under the excitation of a GaN chip, the color coordinates of the W-LED were (0.33, 0.34), and the color temperature was 5752 K, which is close to the color coordinate and color temperature range of standard sunlight. The electric current stability was excellent with an increase in the electric current, voltage, and luminescence intensity of the quantum dots and phosphors by more than 10 times. However, the stability of the quantum dots was slightly insufficient over long working periods. The photocatalytic devices were constructed using TiO2, CsPbBr3, and NiO as an electron transport layer, light absorption layer, and catalyst, respectively. The Cs–Pb–Br-based perovskite quantum dot photocatalytic devices were constructed using a two-step spin coating method, one-step spin coating method, and full PLD technology. In order to improve the water stability of the device, a hydrophobic carbon paste and carbon film were selected as the hole transport layer. The TiO2layer and perovskite layer with different thicknesses and film forming qualities were obtained by changing the spin coating speed. The influence of the spin coating speed on the device’s performance was explored through SEM and a J–V curve to find the best spin coating process. The device constructed by the two-step spin coating method had a higher current density but no obvious increase in the current density under light, while the other two methods could obtain a more obvious light response, but the current density was very low.
研究领域:
材料科学
·
光电
·
光催化
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Jiaqi Dang,Ruifeng Zhu,Wenhui Fang,Ye Hu,Ying Wu,Shixian Xin,Min Li,Bozhen Chen,Hong Zhao,Zengxi Li
It is very crucial to develop a simple and fast-responsive sensor for the detection of water content in organic solvents . Herein, three different europium-organic frameworks (Eu-MOFs): amorphous Eu-2-aminoterephthalic acid (amEu-NH 2 BDC), crystalline Eu-2-aminoterephthalic acid (cryEu-NH 2 BDC) and amorphous Eu-1,4-benzenedicarboxylic acid (amEu-BDC) are synthesized, respectively. amEu-NH 2 BDC is employed as fluorescence probe for the determination of water in ethanol. Results indicate that amEu-NH 2 BDC exhibits good performance due to its dual-wavelength fluorescence (FL) with the ligand (NH 2 BDC)-centered blue luminescence at 430 nm and Eu-centered red luminescence at 615 nm. With the increase of water contents in ethanol, the emission intensity at 430 nm increases dramatically, while that at 615 nm decreases under a single excitation at 270 nm. By measuring the ratio of emission intensity at 430 nm and 615 nm (I 430 /I 615 ), a wide concentration range from 1% to 99.5% water in ethanol is obtained with a lower detection limit value of 0.024% (S/N = 3). Besides, in the presence of water in ethanol, the fluorescence color of amEu-NH 2 BDC changes from red to blue under 365 nm UV light. Thus, the visual device for the detection of water is realized by using amEu-NH 2 BDC. Combined with the fluorescence lifetime and density functional theory, it is shown that red luminescence weakens due to dynamic quenching and non-radiative vibration energy transfer, and blue luminescence is enhanced due to the hydrogen bonding between water and carboxyl groups in the ligand, which enhances the intramolecular charge transfer process. The proposed method has characteristics of rapid response, excellent stability, high sensitivity and selectivity. Importantly, it can be successfully applied to monitor the content of water in white spirit samples.
研究领域:
材料科学
·
分析化学
·
光学传感
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）