JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Yingnan Dong,Yumeng Jia,Kenan Xu,Xu Sun,Jing Wang,Zhongxiang Shi,Yanchen Liu
In order to expand the multi-scene application of rare earth doped luminescent materials in the field of blue light illumination, a series of Ce 3+ doped Na-β″-Al 2 O 3 phosphors were prepared by solid-state method with Na-β″-Al 2 O 3 as matrix. The crystal structure, micro-morphology, optical properties and thermal stability were investigated systematically. The results show that the activated ion Ce 3+ in the prepared Na-β″-Al 2 O 3 : x Ce 3+ phosphor replaces the Al 3+ (CN = 6) lattice in the crystal, and with a outstanding blue light emission. In addition, the thermal stability of Na-β″-Al 2 O 3 : 0.05Ce 3+ phosphor is analyzed by variable temperature spectrum, and its luminescence intensity at 573K can reach 71.55 % at room temperature. Finally, Na-β″-Al 2 O 3 : 0.05Ce 3+ phosphors are packaged with 330 nm n-UV LED chips to obtain high quality blue LED devices. With its high color rendering index (81.60), low color temperature (2886 K) and good color consistency, it provides a theoretical basis for the application of Na-β″-Al 2 O 3 -based phosphors in blue LED devices, and makes it show great application potential in the field of solid-state blue spectral lighting.
研究领域:
材料科学
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固体化学
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发光材料
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照明工程
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无机功能材料
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 41
·e03562
·
IF 26.8
Shangqing Qu,Tianhao Niu,Xianji Qiao,Yanran Shen,Guohong Cai,Xiaoge Wang,Yonggang Wang,Zhipeng Zhou,Shipeng Zhang,Zeyue Zhang,Guobao Li,Guanqun Cai,Junliang Sun
Na- β ″-Al 2 O 3 is a highly promising solid-state electrolyte (SSE) for solid-state sodium batteries (SSSBs) with a wide electrochemical stability window and excellent stability against metallic sodium. However, its practical application is hindered by the instability of β ″ phase ( R 3 ¯ $\bar 3$ m ) during sintering, low polycrystalline ionic conductivity at room temperature, and poor interfacial contact with sodium anodes. In this study, a stablized SSSB is obtained via doping Ga 3+ into Na 1.67 Mg 0.67 Al 10.33 O 17 (NMAO), which also suppresses the formation of the β ′ phase ( P 6 3 / mmc ) and decreases stacking faults. After sintering at 1550 °C for 2 h, Na 1.67 Mg 0.67 Al 9.33 GaO 17 (NMA9.33GO) exhibits an ionic conductivity of 9.2 × 10 −4 S cm −1 at 30 °C, ≈1.7 times greater than NMAO. Furthermore, Ga 3+ doping enhances the wettability with sodium, achieving superior contact stability and the formation of Na-Ga alloys at the interface significantly improves electrode-electrolyte contact stability, achieving a high critical current density (CCD) of 0.8 mA cm −2 and a low interfacial impedance of 16 Ω cm 2 . A quasi-solid-state battery assembled with Na 3 V 2 (PO 4 ) 3 (NVP) as the cathode demonstrates excellent cycling stability and rate performance, retaining a high discharge capacity of 91 mAh g −1 at 5 C, and maintaining 87% capacity retention after 1000 cycles at 1 C. This work provides new insights into improving electrolyte performance and interfacial engineering through doping strategies, thereby promoting the development of efficient and long-term SSSBs.
研究领域:
材料科学
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电化学
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储能
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固态电池
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Hui Zhu,Yanan Li,Yuexiang Xi,Chunli Xin,Cheng Zhou,Zhe Yang,Lang Ruan,Yanyue Li,Yao Peng,Maxim S. Molokeev,Andrey Zolotov,Jing Wang,Zhi Zhou,Mao Xia
β-Al 2 O 3 phosphors show good optical properties for highly symmetric lattices and dense frameworks. Here, an abnormal lattice shrinkage phenomenon is found in BaMg 1-x Zn x Al 9.8 O 17 : Cr 3+ (BM 1-x Z x A: Cr 3+ ) phosphors, which can be attributed to the variation in the covalency of the chemical bond. Accordingly, the denser crystal structure caused by the abnormal shrinkage improves the luminescent intensity (67%↑) and the thermal stability (69%→76%@150 °C). Internal/external quantum efficiency (IQE/EQE) of BZA: 0.2Cr 3+ reaches 95% and 52.7%, respectively. In addition, the preferential occupation of the Cr 3+ ion is discussed through the crystal field strength calculation, low-temperature spectra, and fluorescent lifetime. The unique spectrum of the phosphor derives from the occupation of Cr 3+ on the octahedral sites (Al4 and Al1) and the formation of Cr 3+ -Cr 3+ coupling pairs. Finally, the high matching rate between the absorption curve of plant pigment P fr and the EL spectrum of the as-prepared pc-LED expresses that it can be applied in plant lighting.
研究领域:
材料科学
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光学
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固体化学
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植物生物学
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DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2026
·Vol. 223
·期 6
·e202500691
·
IF 2
Jiasheng Lv,Jiazhen Wu,Jungu Xu
The sodium-conductive ceramic Na-β-Al 2 O 3 serves as an indispensable solid electrolyte material in Na-S battery systems, primarily owing to its exceptional ionic transport properties for Na + ions coupled with remarkable resistance to thermal degradation. However, its limited conductivity at low temperatures restricts practical applications, necessitating strategies to enhance performance. In this paper, a series multicomponent-doped Na 2 Al 10−5 x (Li 2 x Mg x Zn x Ni x )O 16−3.5 x ( x ≤ 0.4) was synthesized through solid-state reaction method, with their phases, microstructures, and electrical properties being thoroughly studied. The results revealed that the highest ionic conductivity (1.2 × 10 −2 S/cm at 300°C) was achieved for the sample x = 0.1, which is five times higher than that of the parent material, significantly exceeding the undoped sample (2.38 × 10 −3 S/cm at 300°C). In addition, the sodium ion migration pathways in Na-β-Al 2 O 3 -based materials were investigated by the bond-valence-based method.
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产品关联
DOI
高影响因子
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
·
2023
·Vol. 237
·期 7
·969-980
·
IF 2.5
Waquar Ahmed Khokhar,Atef El Jery,Adeel Ahmed,Mouataz Aldrdery,Danish Ahmed,Muhammad Usman,Muhammad Rafiq,Raza Ullah,Muhammad Khurram Tufail
Highly conductive and stable β″-Al 2 O 3 electrolyte powder is achieved via the solid-state reaction technique when sintered at 1200 °C, 1250 °C, 1300 °C, 1350 °C, and 1400 °C temperature, correspondingly. The findings show that the ionic conductivity has improved slightly from 1200 °C to 1400 °C. As the sintering temperature is increased, the EIS curve shows a short curve of resistance. A maximum ionic conductivity of 7.07 × 10 −4 S cm −2 is achieved at 1400 °C (1800 Ω). This is caused by the large β″ contents in Al 2 O 3 , as inspected by the X-ray diffraction results. Furthermore, the morphology of Al 2 O 3 shows less porosity and denser particles within the powder.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Xu Sun,Yumeng Jia,Jing Wang,Yingnan Dong,Yanhua Sun,Zhongxiang Shi
Na-β"-Al 2 O 3 matrix materials, featuring a stable layered structure and Na + ions double sites, are promising as host materials for luminescent applications. In this work, a series of broadband Na-β"-Al 2 O 3 : x Eu 2+ , 0.08Ce 3+ cyan phosphors were designed and synthesized. Based on the ability of Eu 2+ to occupy two Na + sites in the Na-β"-Al 2 O 3 matrix, the photoluminescence (PL) spectra displayed dual-peak emissions centered at 470 and 500 nm, with a full width at half maximum (FWHM) of 140 nm. The Na-β"-Al 2 O 3 : Eu 2+ , Ce 3+ phosphors have excellent thermal stability (95.1 %@448 K). Finally, the fabricated white-light-emitting diodes (WLEDs) with CIE 1931 chromaticity coordinates of (0.32, 0.35) and a correlated color temperature (CCT) of 6015 K, indicating their potential for application in full-spectrum WLEDs.
研究领域:
材料科学
·
发光材料
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光电子学
·
固态照明
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Dou,Shengqiang Liu,Fangyi Zhao,Zhen Song,Quanlin Liu
The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu2+-doped Ba(K)-β-Al2O3 blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K+ for Ba2+, the Eu2+-occupied crystallographic site changes and the coordination polyhedron of Eu2+ shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba0.4K1.6)0.84Al22O35−α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) by 1.42 times compared to that of the end-member Ba1.68Al22O35−α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B0.4K1.6)0.84AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 °C). Finally, the WLED fabricated based on (B0.4K1.6)0.84AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1–R15 >90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.
研究领域:
材料科学
·
光子学
·
固态照明
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发光材料
·
光电子学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 18
·期 3
·2301039
·
IF 11
Qianxi Pang,Yichao Wang,Liqing Yan,Ge Zhu,Sai Xu,Jinsu Zhang,Xizhen Zhang,Yongze Cao,Baojiu Chen
Technological progress has promoted the development of ultra-wide near-infrared (NIR) luminescent materials as a new NIR light source. The ultra-wide near-infrared (NIR) emission in Na(Al,Ga) 11 O 17 :xCr 3+ (NAGO:xCr 3+ ) phosphors is achieved by constructing unique Cr 3+ -Cr 3+ ion pair confined structure. The Cr 3+ -Cr 3+ ion pairs can be observed at a low concentration of Cr 3+ ions(x = 0.04), the increase of Ga 3+ ion would promote the formation of Cr 3+ -Cr 3+ ion pairs, thereby effectively enhancing the energy migration process from high-energy Cr 3+ ions to low-energy Cr 3+ ones. Herein, the full width at half maximum can be finely adjusted in a wide range from 17 to 223 nm, while the emission peaks can shift from 704 to 860 nm. NAGO:xCr 3+ exhibits the longest-wavelength emission in the known Cr 3+ -doped galliates and aluminates phosphors. The study further reveals the inherent mechanism of affect on the photoluminescence properties for Cr 3+ -Cr 3+ ion pairs. The quantum efficiency of optimal NaAl 11 O 17 :0.004Cr 3+ (sharp emission) and NaGa 11 O 17 :0.02Cr 3+ (ultra-wide emission) samples reaches 87.6% and 46.6% with high thermal stability (84.47% and 67.52%@150 °C), respectively. The comprehensive properties are excellent among known phosphors with similar property. Multifunctional applications of NAGO:xCr 3+ in agricultural production, quality inspection, and imaging fields are also demonstrated.
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DOI
高影响因子
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