LUMINESCENCE
·
2018
·Vol. 33
·期 2
·438-442
·
IF 1.671
Ting Li,Zhijun Wang,Panlai Li,Shuchao Xu,Qiongyu Bai,Zhiping Yang
A novel tunable red emitting phosphor LiBaB 9 O 15 :Sm 2+ /Sm 3+ , Li + with broad excitation band was synthesized by a high temperature solid-state method. Luminescence properties were investigated in detail by luminescence, X-ray photoelectron spectroscopy (XPS) spectra and CIE chromaticity coordinates. XPS data confirmed that there were Sm 3+ in LiBaB 9 O 15 :Sm 3+ and Sm 2+ /Sm 3+ in LiBaB 9 O 15 :Sm 2+ /Sm 3+ , respectively. Spectral property of LiBaB 9 O 15 :Sm 3+ , LiBaB 9 O 15 :Sm 3+ /Sm 2+ and LiBaB 9 O 15 :Sm 2+ , Li + presented that the excitation band of Sm 3+ widened and the excitation band of Sm 2+ ranged from 350 to 450 nm. And the red light color is tunable with changing Li + concentration. The results indicated that LiBaB 9 O 15 :Sm 2+ /Sm 3+ , Li + may be promising red phosphor for white light emitting diodes.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 7
·6315-6323
·
IF 1.5
Jie Chen,Pei Zhang,Jianfeng Zhao,Hua Yang,Ziyang Liu
We isolated and purified three disamarium metallofullerenes of known structure, Sm 2 @ D 2 (35)-C 88 , Sm 2 @ C 1 (21)-C 92 and Sm 2 @ D 3d (822)-C 104 , by the reported method. Importantly, we characterized these three di-samarium metallofullerenes by cyclic voltammetry and differential pulse voltammetry, which is the first report of electrochemical studies of di-metallofullerenes containing divalent metal atoms. Their oxidation reactions are observed at a maximum positive potential compared with other endohedral metallofullerenes (EMFs), which, other than those of mono-samarium metallofullerenes, have never been reported. The electrochemical studies of these three compounds show much weaker electron-donating capacity and stronger electron-accepting capacity compared with the corresponding Sm-EMFs, fullerenes, or cluster-metallofullerenes. Interestingly, further analysis shows that normal-metallofullerenes present narrower electrochemical potential gaps than cluster-metallofullerenes, which might be attributed to their stronger interaction between the inner metal ions and the carbon cage.
研究领域:
材料化学
·
电化学
·
纳米材料
·
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiajie Pan,Youjie Hua,Zhanhao Fan,Hongping Ma
Far-red light plays a crucial role in the field of plant lighting. Herein, a novel far-red phosphor BaAl 2 Si 3 O 4 N 4 : Sm 2+ , which can be effectively excited by blue light, was successfully prepared by high-temperature solid-state reaction. The PL spectrum show a broadband emission range from 600 nm to 950 nm (FWHM = 120 nm), which is well matched with the absorption of P FR in plant. In BaAl 2 Si 3 O 4 N 4 : Sm 2+ , the Ba 2+ are coordinated with three N and six O atoms. When the rare earth ion of Sm 2+ was doped into the host lattice , Ba 2+ was partially replaced by Sm 2+ . The low temperature PL spectra at 8–80 K were studied in detail. It was found that the PL spectra at low temperature were composed of some sharp lines and broadband superposition, which corresponding to the 5 D 0 - 7 F J (J = 0–4) energy level transition of Sm 2+ . It is shown that the broadband emission of the phosphor was caused by the broadening of the 4f 5 5 d 1 energy level due to the strong crystal field effect. The thermal stability analysis showed that the luminescence intensity of BaAl 2 Si 3 O 4 N 4 : Sm 2+ at 150 °C still maintains 62.7 % of that at room temperature , showing excellent thermal stability. All results indicate that BaAl 2 Si 3 O 4 N 4 : Sm 2+ phosphor has important potential applications in the field of plant lighting.
研究领域:
材料科学
·
光电子学
·
农业光学
·
无机化学
·
发光材料
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Ying Lv,Yunkai Li,Zhongyuan Li,Rong-Jun Xie
Near-infrared (NIR) luminescent materials hold promising applications in NIR spectroscopy technologies, but the NIR emitters are largely limited to some transition metals with spin-forbidden transitions that lead to low absorption efficiency of the pumping light. Exploring novel efficient NIR emitters is thus an urgent and challenging task for developing high-efficiency NIR luminescent materials. Here, an interesting NIR emission of Sm 2+ is reported in BaAlSi 5 O 2 N 7 , which exhibits both a line spectrum at 682 nm and a broadband centered at 778 nm with a full-width at half maximum (FWHM) of 141 nm. Temperature-dependent photoluminescence spectra and decay curves evidence that the thermally assisted electrons crossover (TAEC) process contributes to the enhancement of the broadband NIR emission. The fabricated NIR phosphor-converted light-emitting diode (pc-LED) shows promising potential as a NIR lighting source and proves robust thermal stability under high-temperature aging test. The present surprising NIR emission from Sm 2+ in highly stable oxynitrides opens a way to explore efficient and reliable NIR phosphors that are suitable for commercial LED chips.
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Haiying Huang,Jingtao Zhao,Zheng Wang,Hui Xu,Gongxun Bai,Shilong Zhao,Shiqing Xu,Lihui Huang
LED for plant growth lighting is an effective strategy that can regulate plant growth rhythms and increase yields. Red light is one of the essential spectral components for efficiently driving photosynthesis and regulating plant growth. However, most red phosphors currently used for plant growth lighting suffer from issues such as poor matching between their emission spectra and plant absorption range, poor thermal stability. A series of SrB 6 O 10 : Sm 2+ phosphors were prepared under a reducing atmosphere by high-temperature solid-state reaction method. Systematic investigations were conducted on key characteristics of the phosphors, including crystal structure, luminescence properties, and fluorescence decay curves. Under 365 nm light excitation, SrB 6 O 10 : Sm 2+ phosphor exhibits intense deep-red emission in the 650-850 nm range, with an emission maximum at 685 nm that is ascribed to the 5 D 0 → 7 F 0 transition of Sm 2+ . Additionally, the phosphor shows excellent thermal stability, maintaining 80% of its luminescence intensity at 423 K compared to that at 303 K. Finally, a deep-red LED device was fabricated by coating SrB 6 O 10 : 0.02Sm 2+ phosphor onto a 365 nm LED chip. The photoluminescence spectra of this device exhibit excellent matching with the absorption spectra of phytochrome (P R /P FR ). The results indicate that SrB 6 O 10 : Sm 2+ is a promising deep-red phosphor with significant application potential in plant growth lighting.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Ying Wang,Zhengwen Wei,Min Yu,Zhibo Li,Wei Wang
We synthesized magnesium borate whiskers via a precipitation molten-salt method. We subsequently loaded the Sm 2-x Ce x Zr 2 O 7 catalysts onto the whiskers through precipitation to mimic the hierarchical microstructure of respiratory cilia. The optimal microstructure was achieved with a B:Mg molar ratio of 3:2, yielding whiskers with an aspect ratio (length/diameter) of 42.107. It is clear that the growth of these whiskers on porous cordierite ceramics significantly enhances the specific surface area and soot filtration efficiency. Binding strength tests confirm the robust adhesion of whiskers to the ceramic substrate. H 2 -TPR and O 2 -TPD analyses definitively reveal that Ce-doped catalysts (Sm 1.9 Ce 0.1 Zr 2 O 7 ) possess higher surface-active oxygen content, improve lattice oxygen mobility, and increased oxygen vacancies, leading to superior catalytic activity. XPS further validated the valence states of surface elements. Density functional theory (DFT) calculations prove that Ce doping increases the surface energy of the (222), (400), and (440) crystal planes, while reducing the oxygen vacancy formation energy. This enhances the catalytic combustion performance via the Mars-van Krevelen mechanism. The Z -Sm 1.9 Ce 0.1 Zr 2 O 7 catalysts have been shown to exhibit exceptional soot oxidation performance, lowering the ignition temperature (T 10 ) to 375 °C and the peak combustion temperature (T 50 ) to 425 °C. Cyclic stability tests demonstrate sustained structural integrity and catalytic efficiency. This unique microstructure shows clear potential for diesel particulate filter applications.
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Chenwei Xu,Chenxia Li,Degang Deng,Jianxun Lu,Hua Yu,Le Wang,Xufeng Jing,Shiqing Xu,Chunxu Shao
A series of BaAl12O19:Sm2+/SrAl12O19:Sm3+ mixed-phase phosphors were produced in one step using the traditional high-temperature solid-phase process. Because Sm is divalent in BaAl12O19 and trivalent in SrAl12O19, the coexistence of Sm2+ and Sm3+ is realized in the mixed-phase host. Since the temperature sensitivity of Sm2+ and Sm3+ in the solid solution host is significantly different, this makes it possible for the sample to measure temperature based on the fluorescence intensity ratio (FIR). The crystal model, ion emission spectrum, and temperature sensitivity of these phosphors are studied in detail. Under the co-excitation of a 410 nm excitation source, this sample has excellent temperature measurement performance in the range of 313–513 K. Based on the FIR method, the maximum absolute temperature sensitivity (Sa) is 0.55 K–1 at 513 K, and the maximum relative temperature sensitivity (Sr) is 2.47%K–1 at 453 K. Moreover, based on the photoluminescence lifetime temperature measurement mode, the largest value of Sa at 413 K is 0.046 K–1, and the maximum value of Sr at 473 K is 3.10%K–1. In short, the BaAl12O19:Sm2+/SrAl12O19:Sm3+ solid solution is a kind of phosphor with nice temperature measurement ability, and it has very strong potential in the application of noncontact optical thermometers.
研究领域:
材料科学
·
光学传感器
·
发光材料
·
测温技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Zhi Zhang,Zixin Pan,Wangzu Zou,Shuping Huang,Wenjie Deng,Xinyu Ye,Zhihua Xiong,Daniel Jaque,Decai Huang
Near-infrared (NIR) material is widely recognized for its significant application potential in bioimaging, anti-counterfeiting, and food quality inspection. Divalent rare earth ions are capable of producing broadband NIR emission in suitable host materials and offers high excitation absorption efficiency, owing to their parity allowed f-d transitions. Herein, Sm 2+ -activated SrAl 2 Si 3 O 4 N 4 oxynitride NIR phosphors are prepared, which exhibit a broad excitation band covering the entire visible region (300–650 nm) and a broadband NIR emission (700–1100 nm) peaking at approximately 800 nm. The substitution of Sr 2+ by Ba 2+ is implemented to regulate the local crystal field environment of Sm 2+ ions, thereby achieving a pronounced enhancement in NIR emission intensity. Furthermore, an energy transfer sensitization strategy from Yb 2+ to Sm 2+ is devised, by which an energy transfer efficiency of 70% was attained. The excitation absorption efficiency of BaAl 2 Si 3 O 4 N 4 :0.06Sm 2+ ,0.05Yb 2+ phosphor reached 54%, along with improved photoluminescence quantum efficiency and thermal stability. Finally, NIR pc-LED devices were fabricated using the optimal phosphor and blue LED chip, and demonstrate promising application in biological tissue imaging and detection. The proposed crystal field engineering and energy transfer strategy provides valuable insights for the design and development of NIR phosphors.
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产品关联
DOI
高影响因子
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