JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 12
·9656-9664
·
IF 1.556
Wang Chuanying,Cheng Xianhua
Yb3+ and Er3+ ions co-doped α-NaYF4:Yb3+, Er3+ nanocrystals were successfully synthesized via a facile hydrothermal method using citric acid (CA) as chelating ligand and NaNO3 as mineralizer. The influences
of the CA/RE (RE= Y+Yb+Er) molar ratio, reaction time, reaction temperature and the NaNO3/RE molar ratio on the crystal phases and shapes of as-prepared products have been well investigated. The possible formation mechanism has been discussed in detail and an aggregation growth
theory has been proposed. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), scanning electron microscopy (SEM), and photoluminescence (PL) spectra were used to characterize the products. Under 980 nm excitation, the emission intensities
of the as-prepared nanocrystals were much stronger than that of the nanocrystals modified by ethylenediaminetetraacetic acid (EDTA). Additionally, the as-prepared products maintained spherical shape and high degree of monodispersion, which is expected to be suggestive for the preparation of
other complex rare earth fluoride compounds.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 8
·8254-8270
·
IF 1.798
Xi Junhua,Ding Mingye,Dai Jianbin,Pan Yajing,Chen Daqin,Ji Zhenguo
In this paper, Yb 3+ /Er 3+ co-doped hexagonal NaYF 4 have been successfully synthesized by solvothermal, thermal decomposition, hydrothermal and molten salt method, respectively. The crystal structures, particle morphologies, sizes and corresponding upconversion luminescent properties of β-NaYF 4 :Yb 3+ /Er 3+ nano/microcrystals are systemically studied. It is interesting to observed that the temperature-dependent UC luminescent properties of β-NaYF 4 :20 %Yb 3+ , 2 %Er 3+ samples are strongly related to their synthesis methods. Comparison of the upconversion luminescence and thermal sensitivity between the β-NaYF 4 :Yb 3+ /Er 3+ samples reveals that β-NaYF 4 :Yb 3+ /Er 3+ sub-microplates synthesized by thermal decomposition method have much stronger green emission intensity, better luminescent thermal stability and higher temperature sensitivity. This findings are relevant to the application of β-NaYF 4 :Yb 3+ /Er 3+ in optical temperature sensors and to the further understanding of the UC luminescent mechanism.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Zehui Chen,Mengyan Cao,Zhihui Rao,Xiao Gong
Lanthanide ion-doped metal halides are a promising class of fluorescent materials. In this paper, we investigated the optical properties and photophysical mechanism of Er3+, Yb3+-doped Cs2NaScCl6 phosphor. It was demonstrated that in both up-conversion (UC) and down-shifting emission modes, the increase of Yb3+ concentration resulted in enhancement of the 4F9/2 → 4I15/2 emission of Er3+ in Cs2NaScCl6. In particular, UC emission gradually shifts from green to yellow with the enhancement of the excitation power density observed in Yb3+-rich systems. The complex cross-relaxation behavior between Yb3+ and Er3+ results in these phenomena. New paradigms are provided for the development of multimodal and dynamic fluorescent anticounterfeiting materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 6
·1-10
·
IF 2.5
He Yu,Li Xin,Guo Yangyang,Mao Huibing,Chen Ye,Wang Jiqing
The ZnS: Ho 3+ , Yb 3+ , Mn 2+ nanomaterials fabricated by the co-precipitation method have the zinc-blende structure with the crystallite size about 90 ∼ 100 nm. The X-ray diffraction (XRD), the scanning electron microscope (SEM) and the transmission electron microscope (TEM) characterizations confirm that the doping of the Mn 2+ has less effect on the structure of the ZnS: Ho 3+ , Yb 3+ , Mn 2+ nanomaterials. With the excitation of a 978 nm laser, the upconversion (UC) emissions of the ZnS: Ho 3+ , Yb 3+ , Mn 2+ nanomaterials include two emission bands located at 551 and 664 nm, which correspond to the transitions 5 F 4 ( 5 S 2 )→ 5 I 8 and 5 F 5 → 5 I 8 of the Ho 3+ ions. The UC emission characterization confirms that the UC emission of the ZnS: Ho 3+ , Yb 3+ nanomaterials can be modulated by the doping of the Mn 2+ ions, the increase of the incident laser power and the change of the laser pulse-width. The red emission of the ZnS: Ho 3+ , Yb 3+ nanomaterials particle will increase significantly with the incorporation of the Mn 2+ ions. The incident laser power and the laser pulse-width also can modulate the intensity ratio G / R of the green to the red. With the increase of the incident laser power, the emission intensity ratio G / R will also increase. With the increase of laser pulse-width from 0.2 to 0.8 ms, the above intensity ratio G/R will decrease significantly. The modulation between the green and red emission is due to the energy transfer from the 5 F 4 ( 5 S 2 ) state to the 5 F 5 state of the Ho 3+ ions through the state 4 T 1 of the Mn 2+ ions.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2024
·Vol. 12
·期 12
·327
·
IF 3.1
Ronghua Jian,Tao Pang
This work reports the light-to-heat conversion (LHC) behavior of NaNdF4doped with Sm3+. Due to the cross-relaxation between Nd3+and Sm3+, the improved LHC is obtainable by introducing 5% Sm3+. When the laser power density is only 1.72 W/cm2, the spot temperature of NaNdF4:5%Sm3+powder reaches as high as 138.7 ± 4.04 °C. More importantly, the photoheating response to the pump laser has favorable linear characteristics within a specific power range. A simple physical model is applied to analyze the relationship between photothermal heating and pump power. Finally, the temperature-responsive luminescence anti-counterfeiting is designed by combining the LHC material with the NaYF4:Yb3+/Ho3+/Ce3+microcrystals. This novel strategy only requires two laser beams, and thus is more convenient to apply.
研究领域:
材料科学
·
光学
·
物理化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Rui Wang,Maohui Yuan,Chaofan Zhang,Hongyan Wang,Xiaojun Xu
Transition metal ions (e.g. Mn 2+ ) and lanthanide co-doped upconversion (UC) materials have attracted wide attention in recent years due to their promising application in multicolor display. Here, we report the hydrothermal synthesis and characterization of Mn 2+ doped monodisperse CaF 2 :Yb 3+ /Ho 3+ microspheres . The results of X-ray diffraction (XRD) revealed that Mn 2+ doping does not change the cubic phase of CaF 2 material but will lead to diffraction peaks shifting slightly towards higher angle due to the substitution of larger Ca 2+ by the relatively smaller Mn 2+ . Under the excitation of 980 nm continuous wave (CW) laser, these microspheres exhibit green-yellow-red tuning colors and remarkable enhancement of both red to green ratio (R/G) and red to blue ratio (R/B) when increasing Mn 2+ concentration from 0 to 30 mol%. The energy migration process between Ho 3+ and Mn 2+ was proposed and supported by time-decay and power dependence measurements of Ho 3+ UC emission. These upconversion materials may have potential applications in optical devices , color display, nanoscale lasers and biomedical imaging.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 19
·5210-5217
·
IF 5.976
Shaohua Fan,Guojun Gao,Zhiquan Lin,Weichang Li,Sijun Fan,Shiyu Sun,Hongtao Sun,Lili Hu
High purity green up-conversion (UC) materials have wide applications in fluorescent labeling, plastic recycling and displays, etc. However, Yb3+/Er3+-based UC materials exhibit poor color purity of green light, and their output color is normally unstable under a variable excitation power density, which hinders their application in the aforementioned areas. Herein, we report the highly stable and efficient pure green UC of rod-like β-NaGdF4:Yb3+,Ho3+ submicro-crystals synthesized via a newly developed ion-exchange modified (IEM) method. IEM-derived NaGdF4:Yb3+,Ho3+ monodisperse submicro-crystals present not only a high-purity green output color (due to the large intensity ratio of green to red, IGreen/IRed ≈ 5) but also excellent color stability under varying conditions, such as excitation power density and doping concentration of Yb3+/Ho3+. More importantly, IEM arouses an enormously enhanced UC emission intensity of ∼3700-fold that of the precursor crystals (PC). The UC emission intensity of IEM β-NaGdF4:Yb3+,Ho3+ is ∼4 times stronger than that of its high temperature annealing (HTA) counterpart. The emission intensity of the single green band is ∼40% stronger than that of the IEM β-NaGdF4:20%Yb3+,2%Er3+ submicro-crystals. A proof-of-concept fluorescent labeling of clover patterns (15 × 12 mm) printed from NaGdF4:Yb3+,Ho3+ ink with stable and high purity green fluorescence is demonstrated under excitation with various power densities.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-9
·
IF 3.8
Liu Yongtao,Duan Bin,Zhou Lin,Wu Yuxiang,Wang Fengyi,Ding Changchun,Hu Junshan
Here, this study reports single-band red upconversion emission in β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ phosphor by doping Mn 2+ . The optimum concentration of Mn 2+ ions in β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ phosphor was 0.20. The intensity of red and green emissions is increased by 27.4 and 19.3 times, respectively. Compared with the samples without Mn 2+ ions, the red-green integral strength ratio of β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ /Mn 2+ sample was significantly increased by 28.4 times, reaching 110.9. The UCL mechanism was explored by analyzing the down-conversion luminescence spectra, absorption spectra, UCL spectra, and upconversion fluorescence lifetime decay curves of Yb 3+ /Er 3+ /Mn 2+ co-doped β-Ba 2 ScAlO 5 . The enhancement of upconversion red light is achieved through energy transfer between defect bands and Er 3+ ions, as well as energy transfer between Mn 2+ ions and Er 3+ ions. In addition, the Mn 2+ doped β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ red UCL phosphors have great potential for ambient temperature sensing in the 298–523 K temperature range. The maximum sensitivity of β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ /Mn 2+ phosphor as a temperature sensor at 523 K is 0.0247 K −1 .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2016
·Vol. 41
·期 12
·4273-4278
·
IF 0.957
Huang Shuang,Xu Hua-Lan,Wang Lei,Zhong Sheng-Liang
Rice-like Gd(OH) 3 nanorods were successfully prepared through a facile and rapid microwave-hydrothermal synthesis method without using any surfactants or templates. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and energy-dispersive spectroscopy (EDS) were used to characterize the samples. Results show that the nanorods have an average length of 400 nm and an average diameter of 50 nm. The effects of reaction parameters such as reaction temperature and time on the preparation were briefly investigated. It is found that the crucial factor for the formation of rice-like Gd(OH) 3 nanorods is reaction time. When the rice-like Gd(OH) 3 nanorods was codoped with Yb 3+ and Er 3+ , strong upconversion emissions could be observed under the excitation of 980-nm-laser, and the calculated CIE color coordinates falls within the yellow region, which may be potential candidate for optical materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Xiuna Tian,Hongjian Dou,Lingyuan Wu
Upconversion (UC) luminescent materials have received much attention due to their unique luminescent properties and potential applications in various fields. Yb 3+ /Tm 3+ codoped NaBiF 4 UC material has been successfully synthesized through a solvothermal method. With the excitation of 980 nm laser light, NaBiF 4 :Yb 3+ /Tm 3+ powder show strong UC luminescence. Especially, the near-infrared (NIR) UC emission band of NaBiF 4 :Yb 3+ /Tm 3+ centered at 800 nm is 49 times stronger than the blue emission band. The temperature-dependent UCL properties of NaBiF 4 :Yb 3+ /Tm 3+ were investigated systematically under 980 nm excitation. The results show that all the UC emission peaks of NaBiF 4 : Yb 3+ /Tm 3+ in the region from 300 to 900 nm decrease with the temperature increase except for the emission peak at 697 nm which is positively correlated with temperature. And the UC emissions of NaBiF 4 : Yb 3+ /Tm 3+ exhibits high temperature sensitivity between 303 and 443 K. Therefore, NaBiF 4 : Yb 3+ /Tm 3+ material with strong NIR UCL could be a potential candidate for sensitive temperature sensor .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xuan Liu,Xiaojia Su,Zhuohang Ren,Lingqiu Yang,Xinyue Zhang,Mingye Ding
Currently, developing advanced optoelectronic materials is of great importance to solving serious problem of fake and shoddy products. Lanthanide-doped nanomaterials are particularly suitable for addressing this issue, but limited by the realization of multiple upconverison (UC) emissions upon a single-wavelength laser excitation. Herein, it is proven that the co-dopant of blue/near-infrared (NIR)-emitting activators (Tm 3+ ) and green/red-emitting centers (Er 3+ ) in a particular designed core–shell nanoarchitecture allows the achievement of multiple luminescence over wide spectral region for optical security. In our study, cubic-phased NaYbF 4 :Tm/Er@CaF 2 nanocrystals have been successfully synthesized through a layer-by-layer coprecipitation strategy, which presents visible multicolor UC luminescence and invisible NIR UC emission upon 980 nm laser excitation by just regulating the laser power and temperature. Significantly, the unique luminescent characteristics enables the designed UC nanoparticles a promising candidate for advanced anti-counterfeiting. This works offers a reference to develop advanced optoelectronic materials for practical application in optical security.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Xuekai Wang,Yongze Cao,Xianglan Yan,Guojian Li,Xiangping Li,Jinshu Zhang,Baojiu Chen
Hexagonal Er 3+ /Yb 3+ co-doped LaZrTa 3 O 11 (LZTO) phosphor was prepared by molten salt synthesis with B 2 O 3 flux. Holding temperature, holding time, solute and solvent ratio were regulated. The green upconversion luminescence (UCL) integral intensity of the optimal sample can reach 29.2% of β-NaYF 4 :Er 3+ /Yb 3+ under 980 nm laser excitation. This outstanding pure green UCL is due to the low phonon energy, Er 3+ /Yb 3+ monolayer (2D) distribution, asymmetry of Er 3+ /Yb 3+ doped lattice sites, and low oxygen vacancy. The maximum relative temperature sensitivity attains 0.01221 K −1 at 303 K by employing luminescence intensity ratio (LIR) technique. LZTO:Er 3+ /Yb 3+ phosphor can be used in temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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