Surfaces and Interfaces
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2024
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IF 5.7
Wanying Wu,Jieni Ning,Zhengheng Li,Chaoyang Lei,Qiuxue Jian,Chenzhang Gu,Zhiyao Zhou,Binli Xiao,Sheng Wu,Yinzhen Wang
Te doped Y 3 Al 5 O 12 blue-emission nanophosphors were successfully fabricated by the sol-gel method. The effects of Te doping on the structure, morphology, valence state and luminescence properties of samples were investigated using XRD, SEM, XPS and PL techniques. The results demonstrate that all diffraction peaks are in line with pure Y 3 Al 5 O 12 phase. SEM images exhibit that the prepared samples possess a uniform grain size and nearly spherical shape. The YAG:2 %Te 4+ powder sintered at 900 °C shows intense blue emission at 467 nm under 280 nm excitation, with a lifetime of 2.36 μs. These findings suggest that YAG:Te 4+ powders hold significant potential as suitable candidates for NUV-LED applications.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 5
·2607-2618
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IF 2.779
Gao Zhihua,Fu Fengyan,Niu Lili,Jin M.
In the recent years, luminescent phosphor materials have contributed much to reduce the serious environmental problems such as environmental pollution, greenhouse effect, and energy crisis, but most of them commercially used for fabricating white LEDs are rare earth (RE) ions doped materials. Here, the non-RE Bi 3+ -doped Ba 2 (Y,Sc)NbO 6 solid solution nanocrystals are prepared using a high temperature solid state route followed by a ball milling and griddle selection. Our experiments show that when the Y 3+ ions are replaced by the Sc 3+ ions, the obtained solid solution nanocrystals show a shift of X-ray reflection positions to higher angle, and the emission peaks from blue to blue-green. At the same time, a 1.35 time of PL intensity enhancement under 365 nm excitation is achieved in the Ba 2 (Y 0.58 ,Sc 0.4 )NbO 6 :0.02Bi sample when compared to the Ba 2 Y 0.98 NbO 6 :0.02Bi sample. In addition, this optimal sample shows the quantum efficiency of 76% and good thermal stability with T 50% value of 205 °C. By depositing the Ba 2 (Y 0.58 ,Sc 0.4 )NbO 6 :0.02Bi and commercial red Sr 2 Si 5 N 8 :Eu 2+ phosphors on a 365 nm UV LED chip at a driving current of 30 mA, a white LED device, with a CIE coordinates at (0.364, 0.379), a high color rendering index of 76.8 and luminous efficiency of 67 lm, and a low color temperature of 3469 K, is achieved.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
PLANT AND SOIL
·
2025
·
IF 4.1
Luo Jie,Zhang Qin,Chen Xiulong,Zhou Kai,Zhou Jiahui,Zhao Xiaomin
Background and Aims The heap leaching technique causes considerable damage to environment during the mining of ionic rare earth ore in southern China. Restoration of abandoned mining sites into arable land requires determination of the contents of rare earth elements (REEs) and non-rare earth toxic elements in soil and crops. Methods In the present study, five treatments, including rare earth tailings without any amendment or navel orange cultivation (RET), biochar and fly ash combined with three organic fertilizers (cow manure organic fertilizer [CF], pig manure organic fertilizer [PF], sugarcane bagasse organic fertilizer [SF]), and a treatment without any amendments (CK) were arranged to explore the effects of different treatments on rare earth and non-rare earth toxic elements contents in soil and crops. Results Total EDTA-extractable concentrations of REEs in CF, PF, and SF soils were 42.8%, 26.7%, and 30.5% lower than that those in CK, respectively. Total EDTA-extractable concentrations of non-REEs in the CF, PF, and SF, soils were significantly higher than those in the CK, with the highest in PF, at 337.5%. Compared with CK, all treatments reduced total REEs in navel orange leaves, peel, and pulp. Besides, total rare earth and non-rare earth toxic elements contents in the pulp of the all-treatments navel oranges were all lower than the pollutant limit values for food. Conclusions Use of biochar, fly ash, and SF is the optimal strategy for improving ionic rare earth tailings soil, and navel orange cultivation, is a potential strategy for remediating such abandoned mining sites.
研究领域:
环境科学
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土壤科学
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农业科学
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地球化学
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植物科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Hong Ming,Junfei Zhang,Shuifu Liu,Jiaqing Peng,Fu Du,Jianhui Huang,Libin Xia,Xinyu Ye
Lack of red-light of current w-LEDs restricts their applications in the field of high color rendering index warm solid-state lighting. Fluoride phosphors doped with Mn 4+ provide an efficient way to resolve the problem. Unfortunately, these excellent Mn 4+ activated fluoride red phosphors are generally synthesized in highly toxic HF solution. In this paper, we report a novel green synthetic route to prepare a non-rare-earth and nonequivalent doping type of K 2 NbF 7 :Mn 4+ red phosphor with micro-rod-like morphology. The results of XRD and its Rietveld refinement reveal that all the samples possessed only a single phase with monoclinic P21/c structure and the Mn 4+ ions were successfully incorporated into the crystal lattice . The Mn 4+ ions in K 2 NbF 7 matrix have a highly distorted octahedral environment, which strengthen the intensity of zero phonon line (ZPL). The strongest absorption and excitation bands appear in blue region of diffuse refection spectra (DRS) and the photoluminescence excitation (PLE) of K 2 NbF 7 :Mn 4+ sample, which demonstrates the product perfectly match with the most popular GaN-based blue chip. Under blue light illumination, the as-prepared K 2 NbF 7 :Mn 4+ sample exhibits intense sharp-line red fluorescence (∼628 nm) with internal quantum yield (QY) of 71.3%, an extreme narrow full width at half-maximum (FWHM) of ∼2.8 nm, and an ultra-high-color purity of 99.2%. Impressively, by incorporating K 2 NbF 7 :Mn 4+ as a red component, a warm w-LED with high CRI of 83.8, low color temperature of 3010 K and high luminous efficiency of 115.91 lm/W is obtained, demonstrating great validity of K 2 NbF 7 :Mn 4+ red phosphor for white LED devices.
研究领域:
材料科学
·
光电技术
·
照明技术
✓ 已验证
DOI
高影响因子
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