JOURNAL OF LUMINESCENCE
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2025
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IF 3.6
Chao Wang,Junlin Wang,Dongting Wang,Linli He
In this work, we successfully synthesized a novel lead-free perovskite material Cs 2 TeCl 6 : xMo 4+ (x = 0.02,0.06,0.1,0.2) and conducted in-depth research on its near-infrared emission characteristics. The morphology of the material was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results confirmed that the synthesized Cs 2 TeCl 6 : xMo 4+ exhibited excellent crystallinity and high phase purity. And it exhibits efficient luminescence performance in the near-infrared region, with a maximum emission wavelength of 900 nm and a full width at half maximum of 100 nm. The photoluminescence quantum yield (PLQY) in the near-infrared region (750–1100 nm) measured at an excitation wavelength of 450 nm is as high as 29 %. The temperature-dependent (80–480K) near-infrared PL spectra also exhibit good thermal stability at low and high temperatures. Near infrared phosphor converted LEDs (pc-LEDs) made from this material exhibit excellent stability in the range of 100 mÃ500 mA. The pc-LEDs based on Cs 2 TeCl 6 : 0.1Mo 4+ material exhibit efficient near-infrared emission in the near-infrared region, demonstrating excellent performance in applications such as venous photography, night vision and drug impurity detection. In addition, the excellent performance of this material not only provides new insights for the application of perovskite materials in near-infrared luminescence, but also provides important theoretical and experimental basis for the development of new and efficient near-infrared luminescent materials.
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Catalysts
·
2025
·Vol. 15
·期 7
·623
·
IF 4
Caidong Du,Wenwei Wu,Jiangtao Shang,Keyi Xiang
Methane (CH4) has attracted much attention regarding its use in electrochemical carbon dioxide reduction reaction (CO2RR) due to its high mass-energy density; however, the uneven adsorption of intermediates on copper sites by conventional Cu-based catalysts limits the selective production of CH4. The introduction of a second metal can effectively regulate the adsorption energy of intermediates on the Cu site. In this paper, a method of alloying Cu with oxyphilic metals (M) using rapid electrodeposition is presented; the synergistic effect of the bimetal effectively directed the reaction pathway toward CH4. The best Faraday efficiency for methane occurred in the optimized Cu30La20electrode, reaching 66.9% at −1.7 V vs. RHE potential. In situ infrared testing revealed that the *CHO intermediate—a critical species for the electrocatalytic conversion of CO2to CH4—was detected on the Cu30La20catalytic electrode. However, no *CHO intermediate was observed on the Cu20La30electrode. Instead, the characteristic peak of the *OCCHO intermediate associated with C-C coupling emerged on the Cu20La30catalyst. This indicates that the adsorbed oxygen-containing groups on lanthanum sites reacted with carbon-containing groups on copper sites to form C2products, serving as the primary reason for the shift in reduction products from methane to ethylene.
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CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Xinglong Liu,Lei Wu,Hongheng Chen,Menglin Zhu,Yi Huang,Qun Jing,Xue Yu,Zhaohui Chen
In this work, three novel phosphates – LiRb(PO3)2, NaCs(PO3)2, and RbSr2(PO3)5 – were synthesized via high-temperature solution methodology. NaCs(PO3)2 and RbSr2(PO3)5 crystallize in the centrosymmetric (CS) space groups P21/c and P1̅, respectively, while LiRb(PO3)2 crystallizes in the noncentrosymmetric (NCS) I4̅ space group. It was also found that different cations can flexibly regulate the linking modes of the P–O framework between cyclic and chain. Performance tests show that these three compounds have large band gaps and deep ultraviolet (deep-UV) cutoff edges below 200 nm. First-principles calculations suggest that P–O units contribute mainly to their optical properties. The second harmonic generation (SHG) of LiRb(PO3)2 and the birefringence of the title compounds were also studied. This work provides a valuable guide for designing phosphates with different structural types and deep-UV transmitting optical materials.
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Nuclear Science and Techniques
·
2025
·Vol. 36
·期 9
·1-16
·
IF 3.8
Leng Yang-Chun,Feng Jin-Cai,Jiang Qiao,Li Ze-Hua,Feng Hao-Xin
Colloids are prevalent in nuclear waste repositories, with bentonite colloids posing an uncontrollable risk factor for nuclide migration processes. In this study, static adsorption experiments were coupled with dynamic shower experiments to comprehensively investigate the influence of bentonite colloids on \({\hbox {Sr}^{2+}}\) migration in granite, considering adsorption capacity. Bentonite colloids have a considerably greater adsorption capacity than both bentonite and granite, with a maximum adsorption of 30.303 mg/g. The adsorption behavior of bentonite colloids on \({\hbox {Sr}^{2+}}\) is well described by the Langmuir isotherm and pseudo-second-order kinetic models, indicating that a single-layer chemical adsorption process is controlled by the site activation energy. The adsorbed \({\hbox {Sr}^{2+}}\) is unevenly distributed on the colloids, and the adsorption mechanism may involve ion exchange with Ca. Bentonite colloids exhibit superior adsorption in neutral environments. The cations in groundwater inhibit \({\hbox {Sr}^{2+}}\) adsorption, and the inhibition efficacy decreases in the order \({\hbox {Fe}^{3+}}>{\hbox {Ca}^{2+}}>{\hbox {Mg}^{2+}}>{\hbox {K}^+}\) . The presence of bentonite colloids in a granite column slightly influences the retention of \({\hbox {Sr}^{2+}}\) in the column while markedly reducing the \({\hbox {Sr}^{2+}}\) penetration time from 70 h to 18 h. However, the coexistence of \({\hbox {Co}^{2+}}\) , \({\hbox {Ni}^{2+}}\) , and \({\hbox {Cs}^{+}}\) in a multinuclide system weakens the ability of the colloids to promote \({\hbox {Sr}^{2+}}\) migration. In comigration of colloid and multinuclide systems, the adsorption of nuclides by bentonite colloids causes the nuclide migration speed to decrease in the order \({\hbox {Sr}^{2+}}\) > \({\hbox {Cs}^{+}}\) > \({\hbox {Ni}^{2+}}\) > \({\hbox {Co}^{2+}}\) . This study provides insights into \({\hbox {Sr}^{2+}}\) migration in cave repositories for low- and medium-level radioactive waste.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mingyue Zhang,Ting Li,Kairui Zhang,Baoqing Sun,Le Wang,Zhaoyu Guang
All-inorganic lead-free halide double perovskites (HDPs) with unique soft lattice structure have attractive photoluminence (PL) from self-trapping excitons (STEs). However, pristine HDPs suffer from low PL quantum yiled and narrow color gamut, collectively hindering their applications. Here, heavy metal ion Sb 3+ is introduced into rare-earth-based Cs 2 NaLuCl 6 HDPs to enhance the blue emission intensity of STEs and the mechamism is illustrated through DFT calulation. Then lanthanide ions (Ln 3+ = Er 3+ , Ho 3+ ) are added in blue light emissive Cs 2 NaLuCl 6 : Sb 3+ and typical green and red light emission can be obtained via the energy transfer (ET) from STEs to Er 3+ and Ho 3+ , respectively. Luminescence chromaticity modulation and white emission is achieved by adjusting the doping content of Ln 3+ . Leveraging the distinct thermal responses of STEs and Er 3+ emissions in Cs 2 NaLuCl 6 : Sb 3+ , Er 3+ , a dual-mode fluorescence intensity ratio (FIR) thermometer is proposed by integrating non-thermally coupled energy levels (NTCL) and thermally coupled energy levels (TCL) of STEs and Er 3+ . The dual-mode FIR thermometer exhibits pronounced chromaticity variation (CIE Δy = 0.072) with temperature range from 294 to 473 K, elevated sensitivity (S r = 1.24 %) at 293 K and better repeatability test, demonstrating its application for high-precision visualized optical temperature sensing.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Wang Guancheng,Wei Xiaoli,Feng Kaizheng,Wu Yunfei,Dong Haijiao,Lu Mingze,Du Wei,Fang Qianglong,Ju Ming-Gang,Ma Jing-Yuan,Jiang Yali,Wu Haoan,Ma Ming,Zhang Yu
Prussian blue nanoparticles (PBNPs) have emerged as versatile nanozymes with reactive oxygen species (ROS)-scavenging capabilities, predominantly applied in antioxidant therapies. In this work, we present a combined theoretical and experimental study demonstrating that modulating Fe coordination environments can fundamentally reconfigure PBNPs’ catalytic properties, enabling ROS generation and pro-oxidative functionality. Ab initio molecular dynamics revealed different H 2 O 2 lysis mechanisms at Fe sites with varying coordination numbers: Low-coordinated center (FeN 4 ) induced hydrogen atom transfer to form Fe=O species, while high-coordinated FeN 5 generated ·OH radicals via H + -assisted homolysis under acidic conditions. Guided by calculations, Cs-doped PBNPs (Cs-PBs) with elevated coordination numbers were synthesized via alkali cation stoichiometric control, leveraging high distribution coefficient and low hydration energy of Cs + . Experimental results confirmed radical generation in Cs-PBs aligned with theoretical predictions. The size-optimized Cs-PBs demonstrated ultrahigh peroxidase-like activity (1182.26 U·mg -1 ) and outperformed ROS generating properties in both pollutant degradation and chemodynamic therapy. This work redefines PBNPs’ catalytic potential beyond conventional antioxidant roles, and lays the foundation for innovative environmental and therapeutic solutions.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Zhenbeina Deng,Yusheng Xu,Qiudong Duan,Tianyu Guo,Xianchang Ning,Zhangwen Long,Dacheng Zhou,Qi Wang,Yugeng Wen,Jianbei Qiu
Zero-dimensional (0D) halide perovskites inherently exhibit inefficient energy transfer for lanthanide-based upconversion luminescence (UCL) due to isolated structural units. Despite extensive research efforts, the exploration and validation of thermally enhanced UCL in 0D perovskites remain notably limited. This study demonstrates that Mn 2+ /Yb 3+ /Er 3+ tri-doping can achieve a ninefold enhancement of Er 3+ UCL in 0D Cs 3 BiCl 6 with preferential amplification of green emission. In particular, structural analysis, electron paramagnetic resonance, and steady-state spectroscopies confirm that the formation of Yb 3+ -Mn 2+ dimers can overcome the limitation of an ultralong interionic distance of 0.774 nm, enabling efficient energy transfer upconversion at elevated temperatures. Furthermore, comparative investigations with one-dimensional (Cs 3 Bi 2 Cl 9 ) and three-dimensional (Cs 2 NaBiCl 6 ) perovskites reveal that the pronounced UCL enhancement originates from Mn 2+ -induced lattice distortion and facilitates energy transfer from Yb 3+ -Mn 2+ dimer to Er 3+ . Finally, the optical thermometry exhibits a high absolute sensitivity of 2.09%/K and outstanding thermal cycling properties in the 313–573 K range, paving the way for optical sensing applications and beyond.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zutao Fan,Yayin Liu,Yibo Gao,Junhao Xie,Irene Shuping Zhao,Yu Wang
Near-infrared (NIR) two-dimensional (2D) imaging techniques show remarkable potential for diagnosing dental caries by virtue of the high transparency of tooth enamel in specific NIR light. Vacancy-ordered double perovskite Cs 2 HfCl 6 is a promising candidate for modern light sources for biomedical use due to its low phonon energy and unique optical properties. Re 4+ -doped Cs 2 HfCl 6 produces outstanding NIR emission with ultra-high quantum efficiency (IQE = 91.88 %) over a large spectral range from 700 to 1700 nm. The effect of phonons on emission peak splitting and broadening was investigated using in situ luminescence spectroscopy at different temperatures. Its excellent anti-thermal quenching property (92 % @ 420 K) makes it ideal for use in NIR phosphor-converted light-emitting diodes (NIR pc-LEDs). The fabricated Cs 2 HfCl 6 :Re 4+ @pc-LEDs were validated as a light source for dual-mode NIR caries imaging (transillumination and reflection modes) depending on the ≈1300 nm NIR emission. NIR imaging has greater potential for caries imaging than conventional visual, tactile, and radiographic methods of caries detection, as it allows for the safe and accurate monitoring and diagnosis of enamel lesion occurrence and extent. This study enriches the mentality of designing NIR-emitting materials and opens new avenues for future research on novel NIR-emitting materials for medical imaging.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yao-Wen Yue,Le-Xi Zhang,Quan-Wei Song,Ji-Heng Chai,Yan-Yan Yin,Si-Si Chen,Li-Jian Bie
Recently, halide perovskites (HPs) are considered as rising star materials for humidity sensing beyond their wide applications in the field of optoelectronics. However, the structural instability and toxicity of lead have always limited the application and development of HP materials in electronic devices. In this study, all-inorganic lead-free halide perovskite Cs 2 InCl 5 ·H 2 O (CICH-1) was synthesized by a facile precipitation method at room temperature. Compared with the sample via a harsh hydrothermal method (CICH-2), the CICH-1 perovskite in this work exhibits higher defect density, which brings significant advantages for humidity sensing. In the relative humidity (RH) range of 33%–97%, CICH-1 exhibits good linearity (Adj. R 2 = 0.99), high response (9.1 × 10 3 ), fast response (3 s), small hysteresis (0.89% RH), as well as excellent repeatability and long-term stability. This fine humidity sensing performance enables real-time non-contact monitoring of human finger and breath moisture changes with rapid response-recovery behaviors. This contribution provides a favourable candidate material for humidity detection, and opens up new possibilities for the application of all-inorganic lead-free HPs in sensory devices and further human healthcare.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Li Li,Xu Yang,Wei Zhao,Yongjie Wang,Xianju Zhou,Zhiyu Yang,Xiantong Tang,Jae Su Yu
Lead-free halide double perovskites have attracted significant attention due to various exceptional photoelectric properties. Nevertheless, there is a lack of blue and red light in plant growth, it is worthwhile to look for blue-red dual-emission phosphors with greater thermal stability and high quantum efficiency for creating light-emitting diodes (LEDs) for plant growth. By introducing Sb 3+ and Mn 2+ ions into Cs 2 NaLuCl 6 , which achieves light ranging from blue (455 nm) to red (630 nm) emission. The intensity of prepared material could maintain 70 % of 80 K at 470 K and perform good thermal stability. Additionally, the resemblance between the spectra of the prepared LEDs and the spectra of the Action Spectrum, β-Carotene, Chlorophyll a , and Chlorophyll b , was 75.8 %, 81.9 %, 79.4 %, and 94.7 % respectively, showing a good matching degree, indicating that the samples have a promising application potential in plant growth.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qinhui Bao,Chuwu Xing,Miao He,Zhiwei Nie,Rihua Wang,Chunsheng Wan,Yibin Zhang,Zhiqiang Lu,Duofa Wang,Tianjin Zhang
The sequential deposition process has been widely employed to fabricate perovskite solar cells (PSCs) due to its favorable operability. However, the random orientation of perovskite (PVK) films resulting from the rapid and unregulated solid-liquid reaction poses a significant challenge to enhancing the performance of PSCs prepared via the sequential deposition process. This study proposes a strategy for manipulating the arrangement pattern of lead iodide (PbI₂) crystals to regulate the orientation and uniformity of PVK films. Polyvinylidene fluoride (PVDF) molecules are introduced into the PbI₂ solution to manipulate the arrangement of PbI₂ through their interactions. The enhanced PbI₂ crystals with the (301) plane create favorable conditions for the preferential growth of PVK crystals, significantly improving the crystallinity and uniformity of the PVK film. Ultimately, we achieved formamidinium-rich PSCs with photoelectric conversion efficiencies (PCEs) of 24.84 % for a millimeter-scale device (active area of 0.09 cm 2 ) and 21.15 % for a centimeter-scale device (active area of 1 cm 2 ). Furthermore, the reduction in defect state density and internal stress within the film resulted in unencapsulated devices exhibiting remarkable stability under various harsh environmental conditions.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Yunong Wang,Zhibo Gong,Xiaohui Qi,Wei Zhang,Ruinian Hua
The Er 3+ -based double perovskite Cs 2 NaErCl 6 was successfully synthesized by the dissolve-dry method. The application of organic solvent passivation technology and rare earth doping technology addressed the issue of weak luminescence in perovskite materials. By using cyclohexane (CYH) and ethylene glycol (EG) as passivating agents, the intensity of upconversion luminescence (UCPL) in Cs 2 NaErCl 6 is increased by 240% and 127%, respectively. When Yb 3+ and Gd 3+ ions are incorporated into Cs 2 NaErCl 6 , the intensity of the green upconversion luminescence is increased by 17.1 and 12.3 times, respectively, compared to that of pure Cs 2 NaErCl 6 . The fluorescence enhancement of the former is attributed to the reduction of surface defects. The fluorescence enhancement of the latter may be attributed to the alteration of the upconversion mechanism. The efficient multi-modal luminescence characteristics show promising application potential in temperature sensing, semiconductor devices, anti-counterfeiting measures, and various other domains.
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