JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Jie Chen,Yanhua Song,Ye Sheng,Meiqi Chang,Xiaoming Xie,Murad M.A. Abualrejal,Hongxia Guan,Zhan Shi,Haifeng Zou
Novel luminescent one-dimensional Ln 3+ (Eu, Tb) doped SiO 2 hollow nanofibers were successfully fabricated using a facile and economical co-axial electrospinning technique with subsequent calcination . The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the as-obtained samples present obvious hollow morphology with an average diameter of 303 ± 11 nm and thin walls approximate 76 nm. For SiO 2 :xEu 3+ hollow nanofibers, the highest luminescence intensity, the longest lifetime and the largest quantum efficiency were both in the composition of 6 mol% Eu 3+ . The large value of R 21 indicated a highly disordered environment around Eu 3+ ions in the host, which was better for intense visible red emission. Meanwhile, the spectral characteristics and radiative properties were also analyzed according to the Judd-Ofelt theory from the emission spectra. What's more, under ultraviolet excitation, the emission colors of samples could be tuned from red to green, including bisque by doping Eu 3+ , Tb 3+ and co-doping Eu 3+ /Tb 3+ ions, which indicated the obtained SiO 2 :Ln 3+ hollow nanofibers are potential phosphors in nanostructured optical devices 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
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Zhu Xiaowei,Yang Kuisuo,Wu Anping,Bai He,Bao Jinrong,Qiao Yan,Yang Yunjiang,Li Wenxian,Liu Ying
The novel submicro-spheres SiO 2 @LaPO 4 :Eu@SiO 2 with core-shell-shell structures were prepared by connecting the SiO 2 submicro-spheres and the rare earth ions through an organosilane HOOCC 6 H 4 N(CONH(CH 2 ) 3 Si(OCH 2 CH 3 ) 3 (MABA-Si). The as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (IR). It is found that the intermediate shell of the submicro-spheres was composed by LaPO 4 :Eu nanoparticles with the size of about 4, 5–7, or 15–34 nm. A possible formation mechanism for the SiO 2 @LaPO 4 :Eu@SiO 2 submicro-spheres has been proposed. The dependence of the photoluminescence intensity on the size of the LaPO 4 :Eu nanoparticles has been investigated. The intensity ratios of electrical dipole transition 5 D 0 → 7 F 2 to magnetic dipole transition 5 D 0 → 7 F 1 of Eu 3+ ions were increased with decreasing the size of LaPO 4 :Eu nanoparticles. According to the Judd-Ofelt (J-O) theory, when the size of LaPO 4 :Eu nanoparticles was about 4, 5–7 and 15–34 nm, the calculated J-O parameter Ω 2 (optical transition intensity parameter) was 2.30 × 10 −20 , 1.80 × 10 −20 and 1.20 × 10 −20 , respectively. The increase of Ω 2 indicates that the symmetry of Eu 3+ in the LaPO 4 lattice was gradually reduced. The photoluminescence intensity of the SiO 2 @LaPO 4 :Eu@SiO 2 submicro-spheres was unquenched in aqueous solution even after 15 days.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Weimin Dong,Yingjie Sun,Qian Yao,Lintao Liu,Qingbo Wang,Hang Wen,Jing Li,Xinguang Xu,Jiyang Wang,Robert I. Boughton
Single crystal Pr(BO 2 ) 3 with centimeter size was grown successfully by a flux method using 3Li 2 CO 3 -2H 3 BO 3 as a flux. The absorption spectrum , emission spectrum , and luminescence lifetime of the Pr(BO 2 ) 3 crystal were measured. The crystal has a relatively large absorption cross section and full widths at half maximum (FWHM), which is advantageous for energy absorption from a pumping source. The spectrum parameters were calculated based on Judd–Ofelt (J-O) theory, and the effective J-O parameters were determined to be: Ω 2 = 37.47 × 10 20 cm 2 , Ω 4 = 6.80 × 10 20 cm 2 , and Ω 6 = 1.05 × 10 20 cm 2 . Furthermore, the emission cross section for the 3 P 0 → 3 F 2 transition at 650 nm was calculated to be 13.6 × 10 −19 cm 2 . The fluorescence lifetime of the 3 P 0 level was obtained to be 4.5 ns. The Raman spectrum of the crystal was also analyzed in detail. Physical properties such as thermal and chemical stability, hardness, and cleavage properties were explored. The refractive index and electronic structure were calculated by the first-principles method.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2016
·
IF 1.879
Rong Chen,Ying Tian,Bingpeng Li,Feifei Huang,Caizhi Wang,Xufeng Jing,Junjie Zhang,Shiqing Xu
Nd 3+ /Ho 3+ co-doped silicate-germanate glass has been synthesized by high temperature melt-quenching method. Near infrared emission centered at 2 µm has been successfully obtained by incorporating Nd 3+ and Ho 3+ in present glass. The Judd-Ofelt intensity parameters Ω t (t=2, 4, 6), and radiative properties of Ho 3+ were calculated and discussed by using the Judd-Ofelt theory. The energy transfer processes and luminescence properties of Nd 3+ /Ho 3+ co-doped glasses were analyzed pumped by a conventional 808 nm laser diode . Desirable spectroscopic characteristics indicates that Nd 3+ /Ho 3+ co-doped silicate-germanate glass might be a good alternative matrix for 2 µm band mid-infrared laser.
研究领域:
光学材料
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无机非金属材料
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光子学
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激光技术
·
固体物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）