Journal of Solid State Chemistry最新文献_第7页

Synthesis and carrier transport mechanism in Sol–Gel derived Gd2MnFeO6 rare earth based double perovskite: Insights into polaron hopping and grain boundary effects Gd2MnFeO6稀土基双钙钛矿的合成及载流子输运机制：极化子跳变和晶界效应

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-13 DOI: 10.1016/j.jssc.2025.125779

Siddhartha Swarup Parida, Abhijeet Kumar, Budhendra Singh

Rare-earth based double perovskite Gd₂MnFeO₆ (GMFO) ceramic was successfully synthesised through a modified sol-gel reaction technique involving calcination at 400 °C and sintering at 800 °C under ambient pressure conditions. X-Ray Diffraction analysis and Rietveld refinement confirmed pure orthorhombic crystal structure with space group Pbnm and lattice parameters a = 5.3274 Å, b = 5.6528 Å, c = 7.5797 Å, with orthorhombicity of 0.057. Scanning Electron Micrographs (SEM) revealed heterogeneous grain morphology with predominant plate-like macro structures alongside more massive crystallites, exhibiting well-defined edges and visible porosity. X-Ray Photoelectron Spectroscopy (XPS) confirmed the presence of Gd³⁺, Mn³⁺, and mixed Fe²⁺/Fe³⁺ oxidation states with binding energies of 147.97/141.69 eV, 641.51/653.08 eV, and 710.40–725.23 eV, respectively. Comprehensive impedance spectroscopy analysis (1 kHz–1 MHz, 30 °C–120 °C) revealed distinct grain boundary contributions above 50 °C, with bulk resistance decreasing from 511.5 Ω to 175 Ω (30 °C–80 °C), exhibiting negative temperature coefficient of resistance behaviour. The dielectric constant maxima of ∼800 with excellent thermal stability below 100 °C was seen. AC conductivity analysis yielded activation energy for conduction of 0.286 eV, while electrical modulus analysis revealed enhanced short-range carrier mobility at higher frequencies. Variable Range Hopping (VRH) analysis confirmed polaron-dominated charge transport with hopping lengths ranging from 11.5 to 13 Å: a characteristic of small polaron transport in rare-earth double perovskites. The observed transport mechanisms demonstrate strong correlation between synthesis-induced microstructural features and electrical properties, positioning GMFO as a promising candidate for next-generation electronic applications.

采用改性溶胶-凝胶反应技术，在400℃下煅烧，800℃下常压烧结，成功合成了稀土基双钙钛矿Gd2MnFeO6 （GMFO）陶瓷。x射线衍射分析和Rietveld细化证实了纯正交晶型结构，晶格参数为a = 5.3274 Å， b = 5.6528 Å， c = 7.5797 Å，正交度为0.057。扫描电子显微镜（SEM）显示，晶粒形貌不均匀，以板状宏观结构为主，块状晶体较多，边缘清晰，孔隙度明显。x射线光电子能谱（XPS）证实了Gd3+、Mn3+和Fe2+/Fe3+混合氧化态的存在，结合能分别为147.97/141.69 eV、641.51/653.08 eV和710.40-725.23 eV。综合阻抗谱分析（1 kHz-1 MHz, 30°C - 120°C）显示，在50°C以上晶界贡献明显，体电阻从511.5 Ω降至175 Ω（30°C - 80°C），呈现负温度系数电阻行为。介电常数最大值为~ 800，在100℃以下具有优异的热稳定性。交流电导率分析得到的传导活化能为0.286 eV，而电模量分析显示，高频下的短程载流子迁移率增强。可变范围跳变（VRH）分析证实了极化子主导的电荷输运，跳变长度在11.5 ~ 13 Å之间，这是稀土双钙钛矿中极化子输运的一个小特征。观察到的输运机制表明，合成诱导的微观结构特征与电学性能之间存在很强的相关性，这将GMFO定位为下一代电子应用的有前途的候选者。

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引用次数: 0

The flexible covalent organic frameworks containing tetraphenylethylene (TPE) for the detection of 2,4-dinitrophenol and uptaking iodine 含四苯基乙烯（TPE）的柔性共价有机框架用于检测2,4-二硝基苯酚和吸收碘

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-12 DOI: 10.1016/j.jssc.2025.125778

Qi Peng

Tetraphenylethene (TPE) is a typical aggregation-induced emission chromophore. However, there are no reports on the flexible COFs containing TPE units until now. Herein, two flexible TPE-COFs (HTATPE and TTATPE) were synthesized via Schiff base polymerization reaction. HTATPE and TTATPE exhibit significantly large specific areas of 2274 and 1777 m² g⁻¹, respectively, along with high thermal stability, and partial crystallinity. The flexible TPE-COFs demonstrate high sensitivity in fluorescence detection for 2,4-dinitrophenol (DNP). Their K_SV values are measured at 3.96 × 10⁴ and 3.30 × 10⁴ M⁻¹. Their fluorescence sensing mechanisms to DNP were PET and IFE process. The recovery experiment in river sand samples proved that TTATPE has sufficient sensitivity as a chemical sensor for DNP in environmental samples. The iodine capture capacities of HTATPE and TTATPE were 4.28/4.04 g g⁻¹, 24.71/24.61 mg g⁻¹, and 284.85/287.26 mg g⁻¹ in the I₂ vapor at 350 K, 100 mg L⁻¹ iodine-cyclohexane solution, and 300 mg L⁻¹ iodine-water solution. The iodine adsorption behaviors conformed to the pseudo-first-order model. PXRD and Raman spectra showed that iodine absorption is a chemical adsorption process caused by charge transfer.

四苯乙烯（TPE）是一种典型的聚集致发射发色团。然而，到目前为止，还没有关于包含TPE单元的柔性cof的报道。本文通过席夫碱聚合反应合成了两种柔性TPE-COFs （HTATPE和TTATPE）。HTATPE和TTATPE的比表面积分别为2274和1777 m2 g−1，具有较高的热稳定性和部分结晶度。柔性TPE-COFs对2,4-二硝基苯酚（DNP）的荧光检测具有很高的灵敏度。它们的KSV值分别为3.96 × 104和3.30 × 104 M−1。它们对DNP的荧光感应机制为PET和IFE过程。河砂样品的恢复实验证明TTATPE作为环境样品中DNP的化学传感器具有足够的灵敏度。在350 K、100 mg L−1碘-环己烷溶液和300 mg L−1碘-水溶液中，HTATPE和TTATPE的碘捕获量分别为4.28/4.04 g−1、24.71/24.61 mg g−1和284.85/287.26 mg g−1。碘的吸附行为符合准一级模型。PXRD和拉曼光谱表明，碘吸收是一种电荷转移引起的化学吸附过程。

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引用次数: 0

Synthesis, structure of a three-dimensional Cd-MOF and its application in photocatalytic degradation of ofloxacin 三维Cd-MOF的合成、结构及其在光催化降解氧氟沙星中的应用

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-12 DOI: 10.1016/j.jssc.2025.125781

Xiaoli Wu, Yuyao Wang, Silin Yang, Dawei Wang

A novel Cd(II) metal-organic framework {[Cd(tpa)Cl]·H₂O}_n (Cd-MOF) (tpa = 5-(1H-1,2,4-triazol-1-yl)pyridine-3-carboxylic acid) was prepared via hydrothermal synthesis. X-ray single-crystal analysis revealed that, the Cd-MOF possesses an interesting three-dimensional (3D) network fabricated by Cd–Cl infinite chains and tpa^– ligands, which features a (4,6)-connected topology. The synthesized Cd-MOF exhibited outstanding photocatalytic performance in the degradation of ofloxacin (OFX) under UV light. The removal rate of OFX reached 95.7 % after 80 min of reaction, and it still remained at 85.8 % after 5 cycles. Finally, the photocatalytic mechanism was investigated by means of photocurrent test and active species quenching tests, which indicated that •OH and O₂^•− were the main active species responsible for the degradation of OFX. In addition, the luminescence and structural stability of Cd-MOF were also investigated.

采用水热合成法制备了新型镉（II）金属有机骨架{[Cd(tpa)Cl]·H2O}n (Cd- mof) （tpa = 5-（1h -1,2,4-三唑-1-酰基）吡啶-3-羧酸）。x射线单晶分析表明，Cd-MOF具有一个有趣的三维（3D）网络，由Cd-Cl无限链和tpa -配体组成，具有（4,6）连接的拓扑结构。合成的Cd-MOF在紫外光下对氧氟沙星（OFX）的降解表现出优异的光催化性能。反应80 min后，OFX的去除率达到95.7%，5次循环后仍保持在85.8%。最后，通过光电流实验和活性物质猝灭实验对其光催化机理进行了研究，结果表明：•OH和O2•−是OFX降解的主要活性物质。此外，还研究了Cd-MOF的发光性能和结构稳定性。

引用次数: 0

Phase stability of Ruddlesden–Popper-type Sr3Fe2O5Cl2 with Ba substitution and discovery of a new high-pressure polymorph of Ba3Fe2O5Cl2 Ba取代的ruddlesden - popper型Sr3Fe2O5Cl2的相稳定性及Ba3Fe2O5Cl2高压晶型的发现

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-11 DOI: 10.1016/j.jssc.2025.125776

Jhao-Wei Su , Shunsuke Oka , Hiroya Sakurai , Takashi Mochiku , Yoshihiko Takano , Jiunn-Yuan Lin

Sr

_{3}

Fe

_{2}

O

_{5}

Cl

_{2}

is a member of the Ruddlesden–Popper (RP) phase compounds with tetragonal

I 4 / m m m

symmetry, whereas Ba

_{3}

Fe

_{2}

O

_{5}

Cl

_{2}

has a different crystal structure with cubic

I 2_{1} 3

symmetry. To elucidate the phase relation between these compounds, we systematically investigated the solid-solution system (Ba

_{1 - x}

Sr

_{x}

)

_{3}

Fe

_{2}

O

_{5}

Cl

_{2}

at various temperatures. The RP phase appears only above

x = 0.9

, and the phase boundary is almost independent of temperature. Below

x = 0.5

at 800

° C

, the cubic phase exists as a single phase, whereas a mixed phase of RP and cubic structures appears between the two single-phase regions. The compositional range of the mixed phase narrows as the temperature increases. By contrast, the RP phase becomes significantly more stable over a wider composition range under high pressure; even for

x = 0

, the cubic structure transforms into the RP-type structure under 6 GPa. The RP-type Ba

_{3}

Fe

_{2}

O

_{5}

Cl

_{2}

represents a new polymorph. We analyzed its crystal structure and discuss it in the context of the recently proposed criterion for the stability of the RP phase.

Sr3Fe2O5Cl2是Ruddlesden-Popper （RP）相化合物，具有四方I4/mmm对称性，而Ba3Fe2O5Cl2具有不同的晶体结构，具有立方I213对称性。为了阐明这些化合物之间的相关系，我们系统地研究了不同温度下（Ba1−xSrx）3Fe2O5Cl2的固溶体系。RP相仅在x=0.9以上出现，且相界几乎与温度无关。在800℃下，当x=0.5时，立方相以单相形式存在，而RP和立方结构的混合相出现在两个单相区域之间。随着温度的升高，混合相的组成范围逐渐缩小。相比之下，RP相在高压下在更宽的组成范围内变得更加稳定；即使x=0，在6 GPa下立方结构也转变为rp型结构。rp型Ba3Fe2O5Cl2是一种新的晶型。我们分析了它的晶体结构，并在最近提出的RP相稳定性准则的背景下进行了讨论。

引用次数: 0

Formation enthalpy of B2 and related phases of Al–Cu–Fe system Al-Cu-Fe体系中B2及相关相的生成焓

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-08 DOI: 10.1016/j.jssc.2025.125774

I.A. Tomilin , V.V. Tcherdyntsev , T.A. Sviridova , V.A. Sudarchikov , S.S. Alexandrova , E.V. Medvedeva

The standard enthalpies of formation of binary and ternary alloys of the Al–Cu–Fe system were obtained experimentally by the high-temperature solution calorimetry. The results are in good agreement with the theoretical and experimental literature data. The minimum enthalpies were observed at the iron contents of 60–70 at. %. This was attributed to the D0₃-type ordering characteristic of alloys with compositions close to AlFe₃. Based on the constructed enthalpy diagram, it was proposed that in the B2-ordered solid solutions of the Al–Cu–Fe system, the region with a tendency to ordering with the formation of complex superstructures shifts toward higher aluminum concentrations compared to the binary Al–Fe system. The analysis of the B2 phase lattice parameter concentration dependences showed that the lattice parameter in most cases increase as the Fe/Cu atomic ratio approached unity. It was supposed that one of the factors determining the lattice parameter is the influence of the chemical repulsion forces between Fe and Cu atoms in the crystalline structure. A comparison of the enthalpies of formation of the quasicrystalline phase of the Al–Cu–Fe system with the crystalline phases of the same system showed that the strength of the chemical bond in the quasicrystalline alloy of the system under study is close to that for solid solutions with the B2 structure with the Al/Cu ratio of 2.3–2.5 and an iron content below 50 at. %. This similarity may be due to the fact that the B2 phase of the system under study, from the point of view of local atomic configurations, can be considered as an approximant of the quasicrystalline phase.

用高温溶液量热法测定了Al-Cu-Fe体系二元和三元合金的标准生成焓。计算结果与理论和实验文献数据吻合较好。在铁含量为60 ~ 70 at时，观察到最小焓。%。这是由于成分接近AlFe3的合金具有d03型有序特征。根据构建的焓图，提出了在b2有序的Al-Cu-Fe体系固溶体中，与二元Al-Fe体系相比，随着复杂上层结构的形成，具有有序倾向的区域向铝浓度更高的方向转移。对B2相晶格参数浓度依赖性的分析表明，在大多数情况下，随着Fe/Cu原子比趋于1，晶格参数增大。推测晶格参数的决定因素之一是晶体结构中铁和铜原子之间的化学斥力的影响。Al - Cu - fe体系准晶相的生成焓与同类体系的晶相的生成焓比较表明，该体系准晶合金的化学键强度接近于Al/Cu比为2.3 ~ 2.5、铁含量低于50 at的B2结构固溶体的化学键强度。%。这种相似性可能是由于所研究体系的B2相，从局部原子构型的角度来看，可以被认为是准晶相的近似值。

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引用次数: 0

Glycerol as a green solvent for synthesis of AgBiS2 nanoparticles: Application as dye-sensitized solar cells 甘油作为合成AgBiS2纳米颗粒的绿色溶剂：在染料敏化太阳能电池中的应用

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-06 DOI: 10.1016/j.jssc.2025.125769

Swarada G. More , Almas M. Mujawar , Pankaj K. Bhujbal , Sandesh R. Jadkar , Habib M. Pathan , Sanjay R. Gadakh

It is highly demanding to obtain nano-sized particles at room temperature using a green synthesis protocol. Considering the green approach, for the first time, we have synthesized silver bismuth sulfide nanoparticles (AgBiS₂ NPs) using glycerol as a solvent at room temperature. This protocol uses greener solvent and eliminates the requirement of elevated temperature to produce pure cubic phase AgBiS₂ nanoparticles with a size in the range of 20–90 nm. The synthesized AgBiS₂ nanoparticles are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM) techniques. The band gap of AgBiS₂ NPs is calculated by ultraviolet (UV) spectroscopy, and it is found to be around 1.2 eV, which confirms its potential to be used as an absorber layer in a solar cell. Then, AgBiS₂ NPs film of different thicknesses was prepared by the spin coating method and used in Dye-sensitized solar cell (DSSC). The film with five layers of spin coating shows the best optimized performance with fill factor (FF) 36.99 %, open circuit voltage (V_oc) 0.535 V, short-circuit current density (J_sc) 4.96 mA/cm² and efficiency (η) 0.98 %.

使用绿色合成方案在室温下获得纳米级颗粒的要求很高。考虑到绿色途径，我们首次在室温下以甘油为溶剂合成了硫化铋银纳米颗粒（AgBiS2 NPs）。该方案使用更环保的溶剂，消除了生产尺寸在20-90纳米范围内的纯立方相AgBiS2纳米颗粒的高温要求。采用x射线衍射（XRD）、x射线光电子能谱（XPS）、拉曼光谱、高分辨率透射电子显微镜（HRTEM）和扫描电子显微镜（SEM）等技术对合成的AgBiS2纳米颗粒进行了表征。通过紫外光谱计算AgBiS2 NPs的带隙，发现其带隙约为1.2 eV，证实了其作为太阳能电池吸收层的潜力。然后，采用自旋镀膜法制备不同厚度的AgBiS2 NPs薄膜，并将其应用于染料敏化太阳能电池（DSSC）中。五层自旋镀膜性能最佳，填充系数（FF）为36.99%，开路电压（Voc）为0.535 V，短路电流密度（Jsc）为4.96 mA/cm2，效率（η）为0.98%。

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引用次数: 0

Problems of synthesis and ordering of the medium-entropy perovskite PbSc1/4In1/4Nb1/4Ta1/4O3 中熵钙钛矿PbSc1/4In1/4Nb1/4Ta1/4O3的合成与排序问题

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-05 DOI: 10.1016/j.jssc.2025.125767

Ivan G. Sheptun , Inna V. Lisnevskaya , Elena A. Reshetnikova , Olga Yu. Grapenko , Elizaveta S. Kulikova , Alexey Yu. Seregin , Victoria A. Shuvaeva , Nikita V. Ter-Oganessian

A comparative study of the medium-entropy perovskite PbSc_1/4In_1/4Nb_1/4Ta_1/4O₃ (PSINT), synthesized by solid-state reaction, melt-solution (flux) crystallization, and the gel (sol–gel) route, was carried out. High-resolution synchrotron X-ray diffraction was employed to ensure methodological consistency across all samples. In the solid-state route, prolonged annealing at 800 °C for 100 h completely eliminates the residual pyrochlore impurity, yielding a single-phase cubic perovskite (Pm–3m, a = 4.09538(5) Å). Flux growth produces two crystal types—perovskite and pyrochlore—with compositions deviating from the nominal due to cation segregation in the melt and partial B-site ordering. Superstructure reflections, corresponding to double and triple perovskite cell with a = 4.08661(14) Å, are observed at the diffraction patterns. These reflections presumably originate from mixed 1:1 and 1:2 B-site cation ordering. The gel route proceeds through a transient pyrochlore intermediate that transforms into perovskite near 800 °C. Stabilization of the perovskite structure has been achieved due to an optimum fluorine concentration of about 0.04 at.% per mole of PSINT, whereas reduction of this value, caused by fluorine depletion at higher temperatures (900–1100 °C), leads to regeneration of the pyrochlore phase. The gel-derived PSINT shows the lowest atomic displacement parameters and the highest structural homogeneity. These results provide new information on the influence of synthesis environment on the characteristics of medium-entropy oxide perovskites.

对采用固相反应、熔体-溶液（助熔剂）结晶和凝胶（溶胶-凝胶）法制备中熵钙钛矿PbSc1/4In1/4Nb1/4Ta1/4O3 （PSINT）进行了对比研究。采用高分辨率同步加速器x射线衍射确保所有样品的方法一致性。在固相方法中，800℃下延长退火100 h完全消除了残余的焦绿石杂质，得到单相立方钙钛矿（Pm-3m, a = 4.09538(5) Å）。熔剂生长产生钙钛矿和焦绿石两种晶体类型，由于熔体中的阳离子偏析和部分b位有序，它们的成分偏离了标称。在衍射图上观察到双层和三重钙钛矿电池的上层结构反射，对应于a = 4.08661（14） Å。这些反射可能源于混合1:1和1:2的b位阳离子排序。凝胶途径通过一种瞬态焦绿盐中间体，在800°C附近转化为钙钛矿。由于最佳氟浓度约为0.04 at，钙钛矿结构得以稳定。而在较高温度（900-1100°C）下氟耗尽导致该值降低，导致焦绿盐相再生。凝胶衍生的PSINT具有最低的原子位移参数和最高的结构均匀性。这些结果为合成环境对中熵氧化物钙钛矿性质的影响提供了新的信息。

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引用次数: 0

Terephthalate-based covalent organic framework as high-performance anode material for sodium-ion storage and full cell 基于对苯二甲酸酯的共价有机骨架作为钠离子存储和全电池的高性能负极材料

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-04 DOI: 10.1016/j.jssc.2025.125768

Kun Chu , Tingting Cheng , Taixing Zhu , Zhengyu Huang , Guichao Liu , Shaowen Wu , Ming-Ming Hu , Shihua Dong

Carboxylate-based anode materials have substantial application potential for sodium-ion batteries (SIBs) used for large scale electrochemical energy storage owing to their advantages of high specific capacity, cost-effective and sustainability. Covalent organic frameworks (COFs) are able to improve the cycling stability and rate performance of small organic compound due to their designable compositions and stable porous structures. Herein, terephthalic acid (TPA) was reacted with hexachlorocyclotriphosphazene (HCCP) via polycondensation to prepare TPA-HCCP COF. The prepared COF anode exhibits a low discharge potential of 0.26 V, high reversible specific capacity of 120 mA h g⁻¹ and good rate performance due to its stable microporous framework with abundant accessible active sites. Sodium-ion storage kinetics of the COF is a combination process of diffusion and capacitance due to the electroactive sites of CO and coordinate sites of N for sodium-ions. Full cell was fabricated using Na₄Fe₃(PO₄)₂(P₂O₇) (NFPP) as cathode material to evaluate the practical application potential of the COF anode at wide operation temperature. The NFPP||COF full cell exhibited a high mean voltage of 3.0 V and delivered a specific discharge capacity of 118 mA h g⁻¹. This research provides an effective strategy of designing and preparing terephthalate-based COF anode material and validates its practical application potential for SIBs.

羧酸盐基负极材料具有高比容量、高性价比和可持续性等优点，在大规模电化学储能钠离子电池中具有很大的应用潜力。共价有机框架（COFs）由于其可设计的组成和稳定的多孔结构，能够提高小有机化合物的循环稳定性和速率性能。本文以对苯二甲酸（TPA）和六氯环三磷腈（HCCP）为原料，通过缩聚反应制备了TPA-HCCP COF。制备的COF阳极具有稳定的微孔结构和丰富的活性位点，具有0.26 V的低放电电位、120 mA h g−1的高可逆比容量和良好的倍率性能。由于CO的电活性位点和N的配位位点对钠离子的作用，COF的钠离子储存动力学是一个扩散和电容的结合过程。以Na4Fe3(PO4)2(P2O7) （NFPP）为正极材料制备了全电池，以评价COF阳极在宽工作温度下的实际应用潜力。NFPP||COF电池具有3.0 V的高平均电压和118 mA h g−1的比放电容量。本研究为设计和制备对苯二甲酸盐基COF负极材料提供了一种有效的策略，并验证了其在sib中的实际应用潜力。

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引用次数: 0

Investigation of the luminescent properties of a narrow-band blue-emitting phosphor BaAl12O19: Eu2+/EuAl12O19 for WLED backlight displays WLED背光显示用窄带蓝光荧光粉BaAl12O19: Eu2+/EuAl12O19发光特性研究

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-12-03 DOI: 10.1016/j.jssc.2025.125759

Qingyun Yan, Zhongxiang Shi, Yingnan Dong, Jing Wang

Motivated by the need to exhance the versatility of rare-earth-doped phosphors for solid-state lighting, a series of Eu²⁺-doped BaAl₁₂O₁₉ (BAO: Eu) materials exhibiting narrow-band blue emission were synthesized via a high-temperature solid-state reaction. X-ray diffraction analysis confirmed that the synthesized phosphors crystallize in a pure hexagonal BaAl₁₂O₁₉ phase. Microscopic analysis revealed that the powder consists of uniformly sized microparticles with a hexagonal prism morphology. The BAO: Eu²⁺ phosphors exhibit strong absorption in the 325–410 nm, making them suitable for excitation by near-ultraviolet (NUV) LED chips. Upon excitation at 365 nm, these phosphors emit a narrow-band blue light centered at 445 nm. The emission intensity increases with Eu²⁺ ratio until a quenching threshold is reached at x > 0.28. Notably, the highly symmetric crystal structure of the BaAl₁₂O₁₉ host lattice imparts remarkable luminous thermal stability to the BAO: xEu²⁺ phosphors. Over the temperature range of 298–498 K, the emission intensity at 150 °C retains 91.1 % of its initial value at room temperature. Furthermore, this series of phosphors exhibits high color purity, reaching an optimal value of 99.69 % at a doping ratio of x = 0.28. To demonstrate a practical application beyond lighting, an advanced anti-counterfeiting ink was formulated by dispersing the phosphors into commercial ink. This ink produces a sharp imaging effect under UV light, enabling rapid information decryption and significantly enhancing anti-counterfeiting security. Finally, a prototype blue LED device was fabricated by combining the Ba₀_·₇₂Al₁₂O₁₉: 0.28Eu²⁺ phosphor with a 365 nm near-UV chip. The device demonstrates a high color rendering index, excellent color consistency, and superior color reproduction, underscoring its significant potential in solid-state lighting applications. In conclusion, the BAO: xEu²⁺ phosphors, characterized by their narrow-band emission, exceptional luminous thermal stability, and high color purity, represent a highly promising blue-emitting material for near-UV-pumped white LEDs.

为了提高稀土掺杂荧光粉在固态照明中的通用性，通过高温固态反应合成了一系列具有窄带蓝光发射的Eu2+掺杂BaAl12O19 （BAO: Eu）材料。x射线衍射分析证实，合成的荧光粉结晶为纯六方BaAl12O19相。显微分析表明，粉末由均匀大小的微粒组成，具有六棱柱状形貌。BAO: Eu2+荧光粉在325-410 nm范围内具有很强的吸收，适合近紫外（NUV） LED芯片激发。在365 nm的激发下，这些荧光粉发出以445 nm为中心的窄带蓝光。发射强度随Eu2+比的增加而增加，直至达到淬灭阈值x >； 0.28。值得注意的是，BaAl12O19主体晶格的高度对称晶体结构赋予BAO: xEu2+荧光粉显著的发光热稳定性。在298 ~ 498 K的温度范围内，150℃时的发射强度保持在室温初始值的91.1%。此外，该系列荧光粉具有较高的色纯度，在掺杂比x = 0.28时达到99.69%的最佳值。为了演示照明以外的实际应用，将荧光粉分散到商业油墨中配制了一种先进的防伪油墨。该油墨在紫外光下可产生清晰的成像效果，使信息快速解密，显著增强防伪安全性。最后，将Ba0·72Al12O19: 0.28Eu2+荧光粉与365 nm近紫外芯片相结合，制备了蓝色LED原型器件。该器件具有高显色指数、出色的色彩一致性和卓越的色彩再现性，强调了其在固态照明应用中的巨大潜力。总之，BAO: xEu2+荧光粉具有窄带发光、优异的发光热稳定性和高色纯度等特点，是一种非常有前途的近紫外泵浦白光led蓝色发光材料。

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引用次数: 0

Synergistic strategy and mechanistic elucidation of efficient Cr(VI) photoreduction by heterojunction BiOI/B-g-C3N4 hybrids 异质结BiOI/B-g-C3N4杂化物高效光还原Cr（VI）的协同策略及机理研究

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry

Pub Date : 2025-11-29 DOI: 10.1016/j.jssc.2025.125758

Wangchao Su , Yuhang Gao , Lijun Nie , Yueyu Ma , Xiaobei Han , Lirong Ren , Jianhui Shi

Bismuth iodide oxide/boron-doped graphitic carbon nitride (BiOI/BCN) with a type II heterojunction structure was rationally designed and controllably synthesized using calcination and hydrothermal methods. The loading of BCN can be adjusted to effectively regulate both the electronic band structure and photocatalytic performance of the BiOI/BCN heterojunction. Under simulated sunlight irradiation and without adding an additional sacrificial agent, the BiOI/BCN-1 composite with the optimal doping ratio demonstrated exceptional photocatalytic performance. It completely reduced Cr(VI) within 40 min, with a reaction rate constant of 0.1283 min⁻¹, which was 5.7 times that of pristine BCN and 1.27 times that of BiOI. The superior photocatalytic performance of BiOI/BCN-1 is attributed to its enhanced visible-light absorption, larger specific surface area, increased active sites, and efficient separation of photogenerated carriers, all of which are facilitated by the Type II heterojunction. Recycling tests confirmed that BiOI/BCN-1 maintains high activity even after five cycles. Furthermore, radical trapping experiments confirmed that

e^{-}

and

\cdot O_{2}^{-}

are the dominant active species responsible for the photocatalytic reduction of Cr(VI). This study establishes a strategic method for designing and synthesizing highly efficient Type II heterojunction photocatalysts, providing an effective approach for the photocatalytic reduction of heavy metal ions in wastewater.

采用煅烧法和水热法制备了具有II型异质结结构的碘化铋氧化物/掺硼石墨氮化碳（BiOI/BCN）。BCN的负载可以调节，从而有效地调节BiOI/BCN异质结的电子能带结构和光催化性能。在模拟阳光照射下，在不添加额外牺牲剂的情况下，具有最佳掺杂比的BiOI/BCN-1复合材料表现出优异的光催化性能。在40 min内完全还原Cr(VI)，反应速率常数为0.1283 min−1，是原始BCN的5.7倍，BiOI的1.27倍。BiOI/BCN-1优越的光催化性能是由于其可见光吸收增强，比表面积更大，活性位点增加，光生载流子的有效分离，这些都是II型异质结促进的。回收试验证实，即使在五个循环后，BiOI/BCN-1仍保持高活性。此外，自由基捕获实验证实，e−和·O2−是光催化还原Cr（VI）的主要活性物质。本研究建立了设计和合成高效II型异质结光催化剂的策略方法，为光催化还原废水中重金属离子提供了有效途径。

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