CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhiwei Xia,Yuhan Wang,Rujun Yang,Mengdi Xu,Cunjian Lin,Zhongyuan Li,Ying Lv,Xiaopeng Chi,Shihai You
The interstitial site engineering that purposely creates interstitial luminescent centers in suitable hosts has become an intriguing strategy in designing novel inorganic phosphors. However, effectively tuning the photoluminescence of interstitial activators remains tough challenging at this stage. Here, we demonstrate the effective modulation of interstitial luminescence in inorganic phosphor. In detail, the blue emission band ( λ em = 446 nm) of interstitial Eu 2+ doped α -cristobalite (SiO 2 :Eu 2+ ) is largely enhanced and broadened via a partial, aliovalent substitution of Si 4+ by Al 3+ . After introducing Al 3+ ions into SiO 2 lattice, the full width at half maximum of the blue emission band increase from 59 to 76 nm with a triple growth in quantum efficiency (10.82% → 35.56%). Moreover, the thermal stability improves significantly with a high emission retention of 60% at 325 °C (SiO 2 :0.06Al 3+ ,0.005Eu 2+ ), far higher than that of the parent SiO 2 :0.005Eu 2+ (30%). Encapsulating blue-emitting SiO 2 :Al 3+ ,Eu 2+ along with two commercial green and red phosphors on an ultraviolet LED chip ( λ em = 375 nm), a white LED device with high color rendering index (Ra > 90) was successful fabricated, showing the great potential of this phosphor for achieving high-quality white LED lighting. This study not only provides a promising bule emitter but also sheds light on modulating interstitial luminescence properties in inorganic 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
·
2021
·
IF 4.527
Yao Yang,Yanli Shi,Junjing Duan,Kailei Lu,Gang Cheng,Yiding Zhao,Zhangyi Huang,Peitong Li,Nian Wei,Xinghua Zhu,Jianqi Qi,Tiecheng Lu
The exploration of new red phosphors is important for the development of white light-emitting diodes (w-LEDs), as existing red phosphors exhibit low efficiency and low performance. This work aims to enhance the photoluminescence characteristics of a red-emitting Gd 2 Zr 2 O 7 :Eu 3+ phosphor by co-doping with Al 3+ . Eu 3+ single-doped and Eu 3+ and Al 3+ co-doped Gd 2 Zr 2 O 7 nanophosphors that could be efficiently pumped by commercial near-UV LED chips were prepared by a modified liquid–solid–solution phase-transfer method. X-ray diffraction data revealed that the synthesized phosphors were well crystallized with single-phase fluorite structure. Scanning electron microscopy images showed that the particle size ranges from 15 to 25 nm. In addition, the optical performance of the samples was characterized by fluorescence spectroscopy and lifetime spectroscopy. The effect of Al 3+ on the luminescence performance of the Eu 3+ -doped Gd 2 Zr 2 O 7 phosphor was studied in detail. The emission intensity of the Gd 1.93 Zr 1 · 97 O 7 :Eu 3+ 0.07 Al 3+ 0.03 phosphor was found to be 620% stronger than that of the single-doped Eu 3+ phosphor. These results unambiguously show that the Gd 1.93 Zr 2- x O 7 :Eu 3+ 0.07 Al 3+ x phosphors are promising candidates for application in w-LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Xunsheng Zhou,Binqing Zhao,Lu Yao,Wanting Gui,Longfei Chen,Chao Li,Shi Zhang,Cai Lin Wang
Eutectic scintillators with 6Li-containing thermal neutron absorbers are capable of efficient thermal neutron detection due to lamellar or rod-like optical waveguide structures formed by directional solidification. However, developing stable and bright eutectic scintillators with excellent neutron imaging capability remains a challenge. Here, the performance parameters for the scintillator have been substantially improved by the Al3+ codoping strategy in the LiF-CaF2:Eu2+ system. Due to the Al3+ codoping, the photoluminescence quantum yield (PLQY) is enhanced from 55% to 80%, the light yield is increased from 11,000 to 16,000 photons/thermal neutron, and the scintillation decay time is shortened by about 30 ns. It was shown that Al3+ codoping can effectively reduce the low-frequency shallow-energy level traps. Furthermore, large-sized (50 × 50 × 1.5 mm) translucent LiF-CaF2:Eu2+, Al3+ eutectic ceramics have been fabricated for an Anger-logic position-sensitive detector to realize two-dimensional (2D) thermal neutron detection. A codoped LiF-CaF2 eutectic scintillator provides a ∼1 mm spatial resolution and thermal neutron detection efficiency 16% higher than that of a commercial GS20 scintillator. This research paves the way for the application of large-area eutectic scintillators for efficient thermal neutron detection.
研究领域:
材料科学
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核物理
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光学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yujiao Guo,Yue Yu,Ping Ning,Jiangzhao Chen
Spinel LiMn 2 O 4 has the potential to be used as a cathode material in lithium-ion batteries because of its affordability, low toxicity, and excellent charge/discharge capability. However, severe capacity attenuation results from the degradation of its long-cycle and high-rate performance caused by the Jahn-Teller distortion and Mn dissolution. Herein, a simple solid-state combustion process is used to successfully prepare the Mg 2+ -Al 3+ co-doped LiMn 2 O 4 with truncated octahedral morphology. The Jahn-Teller distortion is inhibited by the stable Mn-O framework and the decreased lattice constant, which in turn lowers the dissolution of Mn. Moreover, Mg 2+ -Al 3+ co-doped LiMn 2 O 4 have lower activation energy and greater Li + diffusion coefficient. As a result, the optimized LiMg 0.03 Al 0.10 Mn 1.87 O 4 delivers satisfied initial capacity of 102.1 mAh‧g −1 with a capacity retention of 76.2 % after 1000 cycles at 10 C. Even at the ultra-high rate of 15 C and 20 C, Mg 2+ -Al 3+ co-doped sample also remain desired structure stability and cycling performance, which remains 73.8 % of its original capacity after 1000 cycles at 20 C. This work provides a reference for developing high-performance and stability cathode materials for lithium-ion battery.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 52
·期 1
·412-419
·
IF 5.6
Jian Lan,Aihua Zhou,Yi Zhang,Yuanxue Cai,Chengguo Ming
To overcome the limitations of static fluorescent anti-counterfeiting, this study proposes a dynamic encryption method based on the afterglow of materials. Through defect engineering, Cu 2+ single-doped and Cu 2+ /Al 3+ co-doped NaGaO 2 (NGO) phosphors were synthesized. The doping of Al 3+ enhances the yellow emission at 610 nm through lattice distortion and defect optimization, while effectively modulating the decay kinetics of Cu 2+ . Millisecond-level lifetime differences were achieved under same-color emission, enabling temporal information encryption. This approach breaks the conventional reliance on multi-color systems and realizes dual-dimensional encoding in both color and time, offering a high-capacity, counterfeit-resistant anti-counterfeiting strategy.
研究领域:
材料科学
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光学材料
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固态化学
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防伪技术
·
光致发光
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）