MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Renping Cao,Jinlong Zhang,Wudi Wang,Zuofu Hu,Ting Chen,Yuanxiu Ye,Xiaoguang Yu
Li 2 Mg 3 SnO 6 :Mn 4+ deep red phosphor is synthesized by high-temperature solid-state reaction method in air. With excitation 330 and 480 nm, the emission band peaking at ∼670 nm within the range 600–790 nm is observed owing to the 2 E → 4 A 2 transition of Mn 4+ ion. Excitation bands peaking at ∼330, 395, and 480 nm in the range of 220–600 nm indicate that Li 2 Mg 3 SnO 6 :Mn 4+ phosphor can be effectively excited by (near) ultraviolet and blue light-emitting diode chips. The optimal Mn 4+ ion concentration is ∼0.4 mol%. Fluorescence lifetime and quantum efficiency of Li 2 Mg 3 SnO 6 :0.4%Mn 4+ phosphor with excitation 330 nm are ∼266.67 μs and 36.3%, respectively. The luminous mechanism is explained by the Tanabe-Sugano energy level diagram of Mn 4+ in the octahedron.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 18
·13278-13282
·
IF 2.019
Mao Y. X.,Pan H. L.,Zhang Y. W.,Liu Q. Q.,Wu H. T.
Li 2 Mg 3 SnO 6 (abbreviation for LMS) ceramics doped with 1–4 wt% lithium fluoride (LiF) were prepared by the conventional solid-state reaction method. The effects of LiF addition on the phase compositions, sintering behaviors and microwave dielectric properties of LMS ceramics were investigated. A small amount of LiF addition could effectively decrease the sintering temperatures due to the liquid phase in the sintering process and induced no apparent degradation of the microwave dielectric properties. The optimized quality factor values for each composition firstly increased and then decreased with the increase of the LiF content. Whereas, the optimized dielectric permittivity increased with increasing of the LiF content. Distinguished microwave dielectric properties with a dielectric constant ( ε
r ) of 11.13, a quality factor ( Q · f ) of 104,750 GHz, and a temperature coefficient of resonant frequency (τ
f
) of −10.83 ppm/°C were obtained for LMS ceramics sintered at 950 °C doped with 3 wt% LiF, which showed that the materials were suitable for the low temperature co-fired ceramics applications (LTCC).
研究领域:
材料科学
·
电子材料
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Zhifen Fu,Jingru Xie,Can Li,Simei Zhai
Li 2 Mg 3 SnO 6 - x wt%BLCT (Bi 2 O 3 -LiF-CaF 2 -TiO 2 , x = 4, 8, 12, 16) ceramics were prepared. The sintering properties, phase composition, microstructure and microwave dielectric properties of Li 2 Mg 3 SnO 6 -based ceramics were studied when x increased from 4 to 16. The results show that all sintered samples are composed of the main phase Li 2 Mg 3 SnO 6 and the second phase Bi 2 O 3 , Mg 2 SnO 4 and CaSnO 3 . Appropriate BLCT additive significantly enhanced sintering ability and dielectric performance of Li 2 Mg 3 SnO 6 -based ceramics. The densification temperature of Li 2 Mg 3 SnO 6 -based ceramics decreased from 1360 °C to 1050 °C due to the addition of BLCT. With the increase of x , the value of quality factor ( Q × f ) gradually decreases, while the value of dielectric constant ( ε r ) and temperature resonance frequency coefficient ( τ f ) gradually increase. For Li 2 Mg 3 SnO 6 -12 wt%BLCT ceramics, the best comprehensive performance of ε r ∼ 12.0, Q × f ∼ 10470 GHz, and τ f ∼ −2.1 ppm/°C can be obtained. Which is expected to be an alternative material for communication component.
研究领域:
材料科学
·
陶瓷与复合材料
·
微波介质材料
·
电子材料
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Xinying Luo,Yang Li,Yiqi Xu,Yue Zhong,Tao Su,Yile Li,Wenming Wang,Yan Pan,Yong Li
The expanding application of near-infrared (NIR) spectroscopy in fields such as bioimaging, night vision, and non-invasive analysis has generated an urgent demand for novel phosphors with ultrabroad emission bands and tunable optical properties. In this work, a series of Cr 3+ -doped Li 2 Mg 3 SnO 6 phosphors were synthesized via a conventional high-temperature solid-state reaction. Under blue light excitation, the phosphors exhibit ultrabroad NIR emission, which is attributed to the 4 T 2 → 4 A 2 transition of Cr 3+ ions. The emission spectra can be effectively modulated by adjusting the Cr 3+ doping concentration. As the concentration increases from 0.1 to 1.5 mol%, the emission peak red-shifts from 725 to 798 nm, accompanied by a significant broadening of the full width at half maximum (FWHM) from 2267.4944 cm −1 to 3373.4350 cm −1 . This behavior indicates strong modulation of energy level splitting and crystal field strength. The optimal photoluminescence (PL) intensity is achieved at a Cr 3+ doping concentration of 0.5 mol%. Furthermore, the excitation spectra monitored at different emission wavelengths (702 and 766 nm) exhibit broad spectral region spanning from the ultraviolet to visible light, with a dominant excitation peak centered at approximately 450 nm, well matching the emission of commercial blue light-emitting diode (LED) chips. A NIR phosphor-converted LED (pc-LED) fabricated using the optimized phosphor demonstrates considerable potential for applications in bioimaging and night vision.
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高影响因子
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