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Artículos de revistas sobre el tema "Lanthanide-ion-doped"

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Autor: Grafiati
Publicado: 6 de septiembre de 2023

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1

Wu, Su Li, Liu Ye, Yan Hui Ning, Wen Bin Niu y Shu Fen Zhang. "Approaches to the Multicolor Tuning of Lanthanide-Ion Doped Upconversion Nanoparticles". Advanced Materials Research 679 (abril de 2013): 69–74. http://dx.doi.org/10.4028/www.scientific.net/amr.679.69.

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In recent years, lanthanide-ion doped nanocrystals have attracted considerable attention for its promising applications in multiplexed biological labeling. These materials can convert near-infrared (NIR) light into visible and offer low autofluorescence, high resistance to photobleaching, high penetration depth and large anti-Stokes shifts. With the development of these techniques, the ability to manipulate multicolor output has become more important for its biological and photovoltaic applications. This review mainly focuses on the recent development of various approaches for the multicolor tuning of lanthanide-ion doped upconversion nanoparticles.
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2

Wang, Haohao, Marcus Lau, Takumi Sannomiya, Bilal Gökce, Stephan Barcikowski, Osamu Odawara y Hiroyuki Wada. "Laser-induced growth of YVO4:Eu3+ nanoparticles from sequential flowing aqueous suspension". RSC Advances 7, n.º 15 (2017): 9002–8. http://dx.doi.org/10.1039/c6ra28118d.

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3

Dugasani, Sreekantha Reddy, Byeongho Park, Bramaramba Gnapareddy, Sreedhara Reddy Pamanji, Sanghyun Yoo, Keun Woo Lee, Seok Lee et al. "Tunable near white light photoluminescence of lanthanide ion (Dy3+, Eu3+and Tb3+) doped DNA lattices". RSC Advances 5, n.º 69 (2015): 55839–46. http://dx.doi.org/10.1039/c5ra07360j.

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4

Gao, Laixu, Xuchen Shan, Xiaoxue Xu, Yongtao Liu, Baolei Liu, Songquan Li, Shihui Wen, Chenshuo Ma, Dayong Jin y Fan Wang. "Correction: Video-rate upconversion display from optimized lanthanide ion doped upconversion nanoparticles". Nanoscale 12, n.º 36 (2020): 18987. http://dx.doi.org/10.1039/d0nr90159h.

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5

Liu, Yuan, Gongxun Bai, Li Jiang, Youjie Hua, Liang Chen y Shiqing Xu. "Lanthanide Nd ion-doped two-dimensional In2Se3 nanosheets with near-infrared luminescence property". Nanophotonics 9, n.º 8 (9 de enero de 2020): 2407–14. http://dx.doi.org/10.1515/nanoph-2019-0450.

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AbstractUltrathin two-dimensional (2D) materials have drawn great attention in recent years due to their promising applications in biomedicine and atomically optoelectronic devices. In this work, we have fabricated a 2D In2Se3 nanosheet doped with Nd3+ ions via the two-step method of solid phase synthesis and liquid exfoliation. Owing to the special inner 4f-4f energy level transitions, lanthanide ions can emit photons with almost the same energy in different environments. Here, a stable near-infrared luminescence from Nd3+-doped 2D In2Se3 nanosheets has been realized, which includes emission bands around 910, 1057, and 1324 nm. The doping of Nd3+ ions extends the emission region of In2Se3 nanosheets. Moreover, the photoluminescence mechanism of Nd3+ ions was investigated through a series of optical measurements. This work not only provides a reliable method to fabricate lanthanide ion-doped 2D materials but also possesses a great significance for luminescence study of lanthanide ions in the 2D matrix.
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6

Bai, Gongxun, Zhibin Yang, Huihong Lin, Wenjing Jie y Jianhua Hao. "Lanthanide Yb/Er co-doped semiconductor layered WSe2 nanosheets with near-infrared luminescence at telecommunication wavelengths". Nanoscale 10, n.º 19 (2018): 9261–67. http://dx.doi.org/10.1039/c8nr01139g.

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7

Xia, Jiale, Hongyang Zhao, Wei Kong Pang, Zongyou Yin, Bo Zhou, Gang He, Zaiping Guo y Yaping Du. "Lanthanide doping induced electrochemical enhancement of Na2Ti3O7 anodes for sodium-ion batteries". Chemical Science 9, n.º 14 (2018): 3421–25. http://dx.doi.org/10.1039/c7sc05185a.

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8

Tanner, Peter A. y Ka Leung Wong. "Synthesis and Spectroscopy of Lanthanide Ion-doped Y2O3". Journal of Physical Chemistry B 108, n.º 1 (enero de 2004): 136–42. http://dx.doi.org/10.1021/jp035583o.

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9

Zhu, Yongsheng, Dongqin Bi, Huiqiao Wang, Yinhua Wang, Xiumei Xu, Zhiwen Lu y Wen Xu. "Fine-tuning of multiple upconversion emissions by controlling the crystal phase and morphology between GdF3:Yb3+,Tm3+ and GdOF:Yb3+,Tm3+ nanocrystals". RSC Advances 7, n.º 5 (2017): 2426–34. http://dx.doi.org/10.1039/c6ra27024g.

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Fine-tuning of multi-color emission characteristics of upconversion lanthanide-ion-doped nanocrystals is of high importance for 3-D color displays, multi-color bio-imaging, and multiplexed cellular labeling.
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10

Gong, Guo, Shaowen Xie, Ya Song, Haihu Tan, Jianxiong Xu, Changfan Zhang y Lijian Xu. "Synthesis of Lanthanide-Ion-Doped NaYF4 RGB Up-Conversion Nanoparticles for Anti-Counterfeiting Application". Journal of Nanoscience and Nanotechnology 18, n.º 12 (1 de diciembre de 2018): 8207–15. http://dx.doi.org/10.1166/jnn.2018.15801.

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Well-defined and mono-dispersed lanthanide-ion-doped NaYF4 up-conversion nanoparticles (UCNPs) were synthesized via thermal decomposition using lanthanide oleate as the precursor. By rational selecting the dopant pairs of the doped lanthanide ions (Y3+, Yb3+, Er3+ and Tm3+) with accurate molar ratios, three-primary-color (RGB) UCNPs which exhibited green (UCNPs-G), blue (UCNPs-B) and red (UCNPs-R) fluorescence, respectively, were prepared. The X-ray diffraction (XRD) patterns showed that the three UCNPs were purely hexagonal-phase NaYF4 crystals. Transmission electron microscopy (TEM) images revealed that the synthesized UCNPs exhibited well-defined nanosphere morphology with uniform size distribution. The average diameters were 23.95±3.35 nm for UCNPs-G, 20.63±2.59 nm for UCNPs-B, and 19.24±2.37 nm for UCNPs-R, respectively. After surface modification employing polyacrylic acid (PAA) as modifier, the obtained UCNPs were converted to be hydrophilic, which can be used as fillers to construct luminescent polymer films and luminescent ink in anti-counterfeiting application.
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11

Zhang, Hai Xia, Rui Jun Ma, Hai Bin Chu, Ming Yan Zhao, Ying Nan Chen, Kai Kong y Yong Liang Zhao. "Synthesis and Photoluminescence Properties of Doped Europium Complexes with 2-Pyrazinecarboxylate". Advanced Materials Research 399-401 (noviembre de 2011): 963–66. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.963.

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Seven europium complexes of 2-pyrazinecarboxylate (pyca) doped with inert fluorescent lanthanide ions (La3+, Y3+) have been synthesized. Elemental analysis, IR spectroscopy, absorption spectroscopy and TG-DSC analysis showed that the complexes have the formulas of Eu(pyca)3•3H2O and EuxRE1-x(pyca)3•3H2O (RE=La, Y; x = 0.7,0.5,0.3), respectively. The lanthanide ions coordinated with carboxylic oxygen atoms and nitrogen atoms of pyca. Luminescence spectra and luminescence life-times of the complexes have been measured and their quantum yields were calculated. The results showed that the existence of La3+and Y3+ions could enhance the luminescence intensity and quantum yield of the europium complexes, which may arise from the intramolecular energy transfer between the inert fluorescent lanthanide ions and Eu3+ion. Those doped complexes have the advantages of strong luminescence, low cost and practical application value.
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12

Yang, Yongsheng, Ke-Zhi Wang y Dongpeng Yan. "Lanthanide doped coordination polymers with tunable afterglow based on phosphorescence energy transfer". Chemical Communications 53, n.º 55 (2017): 7752–55. http://dx.doi.org/10.1039/c7cc04356b.

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Lanthanide ion doped coordination polymers (CPs) exhibit an unusual red/green afterglow with long photoemission lifetimes (10.54 ms for Eu3+ and 57.66 ms for Tb3+) due to the phosphorescence energy transfer at room temperature.
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13

Wang, Mingkai, Chuanyu Hu y Qianqian Su. "Luminescent Lifetime Regulation of Lanthanide-Doped Nanoparticles for Biosensing". Biosensors 12, n.º 2 (19 de febrero de 2022): 131. http://dx.doi.org/10.3390/bios12020131.

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Lanthanide-doped nanoparticles possess numerous advantages including tunable luminescence emission, narrow peak width and excellent optical and thermal stability, especially concerning the long lifetime from microseconds to milliseconds. Differing from other shorter-lifetime fluorescent nanomaterials, the long lifetime of lanthanide-doped nanomaterials is independent with background fluorescence interference and biological tissue depth. This review presents the recent advances in approaches to regulating the lifetime and applications of bioimaging and biodetection. We begin with the introduction of the strategies for regulating the lifetime by modulating the core–shell structure, adjusting the concentration of sensitizer and emitter, changing energy transfer channel, establishing a fluorescence resonance energy transfer pathway and changing temperature. We then summarize the applications of these nanoparticles in biosensing, including ion and molecule detecting, DNA and protease detection, cell labeling, organ imaging and thermal and pH sensing. Finally, the prospects and challenges of the lanthanide lifetime regulation for fundamental research and practical applications are also discussed.
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14

Yan, Chenglin, Haiguang Zhao, Dmitrii F. Perepichka y Federico Rosei. "Lanthanide Ion Doped Upconverting Nanoparticles: Synthesis, Structure and Properties". Small 12, n.º 29 (27 de junio de 2016): 3888–907. http://dx.doi.org/10.1002/smll.201601565.

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15

Yin, Ziqian, Meijuan Li, Jianwen Zhang y Qiang Shen. "Research on Molecular Structure and Electronic Properties of Ln3+ (Ce3+, Tb3+, Pr3+)/Li+ and Eu2+ Co-Doped Sr2Si5N8 via DFT Calculation". Molecules 26, n.º 7 (25 de marzo de 2021): 1849. http://dx.doi.org/10.3390/molecules26071849.

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We use density functional theory (DFT) to study the molecular structure and electronic band structure of Sr2Si5N8:Eu2+ doped with trivalent lanthanides (Ln3+ = Ce3+, Tb3+, Pr3+). Li+ was used as a charge compensator for the charge imbalance caused by the partial replacement of Sr2+ by Ln3+. The doping of Ln lanthanide atom causes the structure of Sr2Si5N8 lattice to shrink due to the smaller atomic radius of Ln3+ and Li+ compared to Sr2+. The doped structure’s formation energy indicates that the formation energy of Li+, which is used to compensate for the charge imbalance, is the lowest when the Sr2 site is doped. Thus, a suitable Li+ doping site for double-doped lanthanide ions can be provided. In Sr2Si5N8:Eu2+, the doped Ce3+ can occupy partly the site of Sr12+ ([SrN8]), while Eu2+ accounts for Sr12+ and Sr22+ ([SrN10]). When the Pr3+ ion is selected as the dopant in Sr2Si5N8:Eu2+, Pr3+ and Eu2+ would replace Sr22+ simultaneously. In this theoretical model, the replacement of Sr2+ by Tb3+ cannot exist reasonably. For the electronic structure, the energy level of Sr2Si5N8:Eu2+/Li+ doped with Ce3+ and Pr3+ appears at the bottom of the conduction band or in the forbidden band, which reduces the energy bandgap of Sr2Si5N8. We use DFT+U to adjust the lanthanide ion 4f energy level. The adjusted 4f-CBM of CeSr1LiSr1-Sr2Si5N8 is from 2.42 to 2.85 eV. The energy range of 4f-CBM in PrSr1LiSr1-Sr2Si5N8 is 2.75–2.99 eV and its peak is 2.90 eV; the addition of Ce3+ in EuSr1CeSr1LiSr1 made the 4f energy level of Eu2+ blue shift. The addition of Pr3+ in EuSr2PrSr2LiSr1 makes part of the Eu2+ 4f energy level blue shift. Eu2+ 4f energy level in EuSr2CeSr1LiSr1 is not in the forbidden band, so Eu2+ is not used as the emission center.
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16

Chen, G., R. G. Haire y J. R. Peterson. "Eu3+ Ion Luminescence Spectra from Lanthanide Sesquioxides Exhibiting Three Different Crystal Structures". Applied Spectroscopy 46, n.º 2 (febrero de 1992): 273–76. http://dx.doi.org/10.1366/0003702924125483.

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We have investigated the Eu3+ ion luminescence spectra from different host crystals of the lanthanide sesquioxides exhibiting either the A, B, or C form. The Eu3+ ion luminescence spectra from B-type Eu2O3 and from Eu3+-doped A-type La2O3 and C-type Lu2O3 were obtained at room temperature. It is suggested that the luminescence from f-f transitions in the Eu3+ ion can be used to determine the crystal structure, because the different Eu3+ ion site symmetries in the different crystal structures give rise to different characteristic spectral splitting patterns.
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17

Zhang, Bohang, Gaihui Liu, Huihui Shi, Qiao Wu, Suqin Xue, Tingting Shao, Fuchun Zhang y Xinghui Liu. "Density Functional Theory Study of Electronic Structure and Optical Properties of Ln3+-Doped γ-Bi2MoO6 (Ln=Gd, Ho, Yb)". Crystals 13, n.º 8 (26 de julio de 2023): 1158. http://dx.doi.org/10.3390/cryst13081158.

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Based on density functional theory (DFT), theoretical models of three kinds of lanthanide rare earth metal ion-doped γ-Bi2MoO6 were constructed (Ln-BMO (Ln=Gd, Ho, Yb)). The geometric structure, electronic structure, and optical properties of the model were calculated, and the influence of doped Ln3+ ions on the structures and properties of the system was analyzed. The results revealed that the substitution of smaller ionic radius Ln3+ ions for Bi3+ ions caused a contraction of the lattice parameters. At the same time, the contribution of the [Ln]4d near valence band and conduction band reduced the bandwidth of γ-Bi2MoO6, forming the Ln-O ionic bond with different strengths to obtain higher charge conductivity and charge-separation ability. Secondly, Ln3+ ions have a strongly ionic charge, which leads to the appearance of optical absorption bands in the infrared region and part of the visible region. This reduces the reflection in the visible region, improves the utilization rate, delays the loss of electron energy, and promotes phase matching in the visible region. And the Gd3+-doped system has better photocatalytic activity than the other Ln3+-doped system. This research provides theoretical insights into doped lanthanide rare earth ions and also provides strategies for the modification of γ-Bi2MoO6 nanomaterials.
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18

HE, JUNHUI, IZUMI ICHINOSE, SHIGENORI FUJIKAWA y TOYOKI KUNITAKE. "SYNTHESIS OF METAL AND METAL OXIDE NANOPARTICLES IN THE NANOSPACE OF ULTRATHIN TiO2-Gel FILMS: ROLE OF THE ION-EXCHANGE SITE". International Journal of Nanoscience 01, n.º 05n06 (octubre de 2002): 507–13. http://dx.doi.org/10.1142/s0219581x02000589.

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In this work, we showed that metal salts were easily deposited as aggregates (e.g., ultrathin planar microcrystals) on the surface of TiO 2- gel films in the absence of ion-exchange sites. In contrast, metal ions were efficiently incorporated into ultrathin TiO 2- gel films, when ion-exchange sites were created using Mg ( O - Et )2 as template. A variety of metal ions, including those of main group, transition, and lanthanide elements were successfully doped into TiO 2 thin films by the current approach. Probable distribution of the ion-exchange site in the film interior was discussed.
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19

Blanca-Romero, A., A. Flores-Riveros y J. F. Rivas-Silva. "Structure Study of ZnO:Eu with the Supercell Method". Journal of Nano Research 9 (febrero de 2010): 25–30. http://dx.doi.org/10.4028/www.scientific.net/jnanor.9.25.

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One of the interests on the study of doped materials with rare earths in their bulk or nanoscale size is owing to the enhancement of the intensity of light in their photoluminescence when a lanthanide exists in a receptor material, as ZnO in our case. Until now, one of the most useful theories for calculations of electronic properties in molecular and solid state systems is the Density Functional Theory (DFT), which is not capable to manage well the presence of high localized electrons, as in lanthanide compounds in general and the doped case in particular. We propose to study these materials with super cell model using some correction to the standard calculations. For this goal, we employ the WIEN2k [1] code using the LDA+U approximation to take into account the strong correlation of the f electrons coming from the lanthanide. We emphasise the study of deformation due to the presence of Eu ion in the structure of host material, optimizing the position of neighboring Oxygen atoms. This deformation has been related to Kondo Resonance [2] appearing around the Fermi Energy of the compound, due to hybridization [3] among the f electrons from rare earth and neighboring oxygen levels.
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20

Gao, Laixu, Xuchen Shan, Xiaoxue Xu, Yongtao Liu, Baolei Liu, Songquan Li, Shihui Wen, Chenshuo Ma, Dayong Jin y Fan Wang. "Video-rate upconversion display from optimized lanthanide ion doped upconversion nanoparticles". Nanoscale 12, n.º 36 (2020): 18595–99. http://dx.doi.org/10.1039/d0nr03076g.

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21

Ohta, M., T. Hayakawa y H. Furukawa. "Application of lanthanide ion doped alkaline metal sulfates to ESR imaging". Journal of Alloys and Compounds 250, n.º 1-2 (marzo de 1997): 431–34. http://dx.doi.org/10.1016/s0925-8388(96)02724-7.

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22

Korotaev, Evgeniy V., Mikhail M. Syrokvashin, Irina Yu Filatova y Valentina V. Zvereva. "Magnetic Properties of Novel Layered Disulfides CuCr0.99Ln0.01S2 (Ln = La…Lu)". Materials 14, n.º 17 (6 de septiembre de 2021): 5101. http://dx.doi.org/10.3390/ma14175101.

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The comprehensive study of the lanthanide-doped solid solutions CuCr0.99Ln0.01S2 (Ln = La…Lu) magnetic properties was carried out using static magnetochemistry and differential scanning calorimetry techniques. It was shown that magnetic properties of CuCr0.99Ln0.01S2 are significantly affected by the magnetic properties of the lanthanide ion. The magnetic susceptibility and the effective magnetic moment were found to deviate from the Curie-Weiss law in the temperature 90 K below and 50 K above the order-disorder transition at 695 K. The observed behavior of the temperature dependence of the effective magnetic moment in the order-disorder transition temperature region was described as a result of copper atoms redistribution over different types of the crystallographic sites.
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23

Bogachev, Nikita A., Anna A. Betina, Tatyana S. Bulatova, Viktor G. Nosov, Stefaniia S. Kolesnik, Ilya I. Tumkin, Mikhail N. Ryazantsev, Mikhail Yu Skripkin y Andrey S. Mereshchenko. "Lanthanide-Ion-Doping Effect on the Morphology and the Structure of NaYF4:Ln3+ Nanoparticles". Nanomaterials 12, n.º 17 (27 de agosto de 2022): 2972. http://dx.doi.org/10.3390/nano12172972.

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Two series of β-NaYF4:Ln3+ nanoparticles (Ln = La–Nd, Sm–Lu) containing 20 at. % and 40 at. % of Ln3+ with well-defined morphology and size were synthesized via a facile citric-acid-assisted hydrothermal method using rare-earth chlorides as the precursors. The materials were composed from the particles that have a shape of uniform hexagonal prisms with an approximate size of 80–1100 nm. The mean diameter of NaYF4:Ln3+ crystals non-monotonically depended on the lanthanide atomic number and the minimum size was observed for Gd3+-doped materials. At the same time, the unit cell parameters decreased from La to Lu according to XRD data analysis. The diameter-to-length ratio increased from La to Lu in both studied series. The effect of the doping lanthanide(III) ion nature on particle size and shape was explained in terms of crystal growth dynamics. This study reports the correlation between the nanoparticle morphologies and the type and content of doping lanthanide ions. The obtained results shed light on the understanding of intrinsic factors’ effect on structural features of the nanocrystalline materials.
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24

Xu, Lan, Zujian Wang, Bin Su, Chenxi Wang, Xiaoming Yang, Rongbing Su, Xifa Long y Chao He. "Origin of Structural Change Driven by A-Site Lanthanide Doping in ABO3-Type Perovskite Ferroelectrics". Crystals 10, n.º 6 (29 de mayo de 2020): 434. http://dx.doi.org/10.3390/cryst10060434.

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Lanthanide doping is widely employed to tune structural change temperature and electrical properties in ABO3-type perovskite ferroelectric materials. However, the reason that A-site lanthanide doping leads to the decrease of the Curie temperature is still not clear. Based on the reported Curie temperature of lanthanides (Ln) doped in two classic ferroelectrics PbTiO3 and BaTiO3 with A2+B4+O3-type perovskite structure, we discussed the relationship between the decrease rate of Curie temperature (ΔTC) and the bond strength variance of A-site cation (σ). For Nd ion doped Pb(Mg1/3Nb2/3)O3-PbTiO3 (Nd-PMNT) ferroelectric crystal as an example, the internal factors of the dramatic decline of the Curie temperature induced by A-site Nd doping were investigated under a systematic study. The strong covalent bonds of Ln-O play an important role in A-site Ln composition-induced structural change from ferroelectric to paraelectric phase, and it is responsible for the significant decrease in the Curie temperature. It is proposed that the cells become cubic around the Ln ions due to the strong covalent energy of Ln-O bonding in A-site Ln doped A2+B4+O3 perovskite ferroelectrics.
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25

Zheng, Lu, Jin Chen, Jianke Sun, Min Liu, Yuyu Gao y Zhifeng Guo. "Highly selective lanthanide-doped ion sieves for lithium recovery from aqueous solutions". Journal of Chemical Research 47, n.º 2 (marzo de 2023): 174751982311590. http://dx.doi.org/10.1177/17475198231159051.

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The increased global demand for lithium is rapidly depleting the lithium ore reserves. Therefore, attention has turned to the recovery of lithium from aqueous solutions, such as lithium-containing brine. Compared with other methods of lithium recovery, adsorption is energy efficient and simple to implement, increasing demand for selective lithium adsorbents. In this study, a selective lithium-ion adsorbent, H4Ti5– xLa xO12, was synthesized via the sol–gel method, followed by heat treatment and acid washing. The effects of the temperature and degree of lanthanum doping ( x) on the crystalline phase, morphology, lithium-ion adsorption capacity, and lithium-ion selectivity of the ion sieve were investigated, and the optimal synthetic conditions were determined. We found that doping with La3+ cations ( x = 0.01) increased the lithium-ion adsorption capacity (23.96 mg g−1 at 25 °C at pH = 12; 8.2% higher than before doping), rate, and selectivity. In addition, the ion sieve could be used over multiple adsorption–desorption cycles with only a minor reduction in the lithium-ion adsorption capacity (22.88 mg g−1). Overall, these results suggest that doping with La3+ cations stabilized the H4Ti5– xLa xO12 crystal structure, alleviated particle agglomeration, expanded the lithium-ion channels, and decreased the resistance to lithium-ion migration, thus improving adsorption performance. The findings suggest that the proposed ion sieve has practical applications in the selective recovery of lithium from aqueous solutions containing a mixture of metal ions.
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26

Wang, Xiaojing, Yi Yang, Nan Chen, Bingfa Liu y Guihua Liu. "Preparation of LaF3:Eu3+ Based Inorganic–Organic Hybrid Nanostructures via an Ion Exchange Method and Their Strong Luminescence". Journal of Nanoscience and Nanotechnology 16, n.º 4 (1 de abril de 2016): 3729–34. http://dx.doi.org/10.1166/jnn.2016.12339.

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Lanthanide doped inorganic–organic hybrid nanostructures have received much attention in recent years due to their strong luminescence sensitized by organic ligands via an energy transfer route. In this work, an ion exchange method was used to prepare Eu3+ doped LaF3 based inorganic– organic hybrid nanostructures with organic ligands. The undoped LaF3 nanoparticles were first synthesized by a hydrothermal method, and Eu3+ ions were then ion exchanged into these LaF3 nanoparticles to form the Eu3+ doped LaF3 nanoparticles, which were then used to prepare the inorganic–organic hybrid nanostructures with benzoic acid and 2-thenoyltrifluoroacetone. As a result of the luminescence sensitization, strong luminescence was observed in these inorganic–organic hybrid nanostructures, and the luminescence enhancement was over 40 times. Dependence of the luminescence of the hybrid nanostructures on the doping concentration and amount of organic ligands was studied in detail, and optimization was conducted to obtain the maximum luminescence for the hybrid nanostructures.
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27

Liu, Yu, Ziwen Zhou, Shaojian Zhang, Enming Zhao, Jing Ren, Lu Liu y Jianzhong Zhang. "Mechanisms of Upconversion Luminescence of Er3+-Doped NaYF4 via 980 and 1530 nm Excitation". Nanomaterials 11, n.º 10 (19 de octubre de 2021): 2767. http://dx.doi.org/10.3390/nano11102767.

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To date, the mechanisms of Er3+ upconversion luminescence via 980 and 1530 nm excitation have been extensively investigated; however, based on discussions, they either suffer from the lack of convincing evidence or require elaborated and time-consuming numerical simulations. In this work, the steady-state and time-resolved upconversion luminescence data of Er3+-doped NaYF4 were measured; we therefore investigated the upconversion mechanisms of Er3+ on the basis of the spectroscopic observations and the simplified rate equation modeling. This work provides a relatively simple strategy to reveal the UCL mechanisms of Er3+ upon excitation with various wavelengths, which may also be used in other lanthanide ion-doped systems.
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28

Speghini, A., M. Bettinelli, P. Riello, S. Bucella y A. Benedetti. "Preparation, structural characterization, and luminescence properties of Eu3+-doped nanocrystalline ZrO2". Journal of Materials Research 20, n.º 10 (octubre de 2005): 2780–91. http://dx.doi.org/10.1557/jmr.2005.0358.

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Eu3+-doped zirconia nanopowders were prepared by the sol-gel technique using two different methods, based on the hydrolysis of zirconium n-propoxide, producing tetragonal and monoclinic zirconia under different preparation conditions. A detailed microstructure characterization was performed through wide angle x-ray scattering, small angle x-ray scattering, trasmission electron microscopy, and nitrogen physisorption measurements. The possible influence of the zirconia crystalline phases and particle sizes on the luminescence properties of the lanthanide ion was investigated. A detailed analysis of the emission spectra of the samples suggested that the dopant Eu3+ ions replace the Zr4+ ions in the zirconia crystal lattice. Moreover, samples prepared by the two different methods were characterized by different decay times of the Eu3+ ion luminescence.
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29

Naccache, Rafik, Emma Martín Rodríguez, Nicoleta Bogdan, Francisco Sanz-Rodríguez, Maria del Carmen Iglesias de la Cruz, Ángeles Juarranz de la Fuente, Fiorenzo Vetrone, Daniel Jaque, José García Solé y John A. Capobianco. "High Resolution Fluorescence Imaging of Cancers Using Lanthanide Ion-Doped Upconverting Nanocrystals". Cancers 4, n.º 4 (22 de octubre de 2012): 1067–105. http://dx.doi.org/10.3390/cancers4041067.

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30

Casanova, Didier, Domitille Giaume, Emmanuel Beaurepaire, Thierry Gacoin, Jean-Pierre Boilot y Antigoni Alexandrou. "Optical in situ size determination of single lanthanide-ion doped oxide nanoparticles". Applied Physics Letters 89, n.º 25 (18 de diciembre de 2006): 253103. http://dx.doi.org/10.1063/1.2405871.

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31

Yoo, Sanghyun, Sreekantha Reddy Dugasani, Prathamesh Chopade, Mallikarjuna Reddy Kesama, Bramaramba Gnapareddy y Sung Ha Park. "Metal and Lanthanide Ion-Co-doped Synthetic and Salmon DNA Thin Films". ACS Omega 4, n.º 4 (9 de abril de 2019): 6530–37. http://dx.doi.org/10.1021/acsomega.9b00319.

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32

Taek Lee, Kang, Sang Hwan Nam, Yun Mi Bae, Yong Il Park, Jeong Hyun Kim, Hyung Min Kim, Joon Sig Choi, Taeghwan Hyeon y Yung Doug Suh. "Real-Time Tracking of Lanthanide Ion Doped Upconverting Nanoparticles in Living Cells". Biophysical Journal 102, n.º 3 (enero de 2012): 200a. http://dx.doi.org/10.1016/j.bpj.2011.11.1088.

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33

Silva, Flávia R. O., Nelson B. de Lima, Deiby S. Gouveia, Nildemar A. M. Ferreira, Valter Ussui, Lilia C. Courrol y Ana Helena A. Bressiani. "Europium-Doped Hydroxyapatite: Influence of Excitation Wavelength on the Eu3+ Luminescence in the Hydroxyapatite". Materials Science Forum 820 (junio de 2015): 335–40. http://dx.doi.org/10.4028/www.scientific.net/msf.820.335.

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Hydroxyapatite (HA) doped with europium (HAEu) offers the advantage of making the hydroxyapatite a fluorescent biomarker, allowing their imaging through emissionin vivoandin vitrotests. Several authors had been based their studies about europium site occupation (CaI and CaII) in hydroxyapatite by the lanthanide ion luminescence, verifying the influence of the method of synthesis and concentration of the dopant ion. In this study HA nanoparticles doped with 1.4 mol% of trivalent europium were synthesized by co-precipitation method and thermal treated at different temperatures (600°C and 1200°C). A careful evaluation of the influence of the excitation wavelength of europium luminescence in the HAEu was performed and it has been verified that both the characteristics transitions of europium, at CaI and CaII sites, and the luminescent intensity are dependent on the excitation wavelength. The non-observance of this fact can lead to erroneous conclusions about the site occupation of europium in hydroxyapatites.
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34

Fuentes, S., D. Espinoza y J. León. "Synthesis, Characterization and Optical Properties of ZnO Nanoparticles Doped with Er and Yb". Journal of Nanoscience and Nanotechnology 21, n.º 11 (1 de noviembre de 2021): 5714–22. http://dx.doi.org/10.1166/jnn.2021.19489.

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This paper discusses the structure, particle morphology, and optical properties of un-doped ZnO and ZnO doped with Er3+ and Yb3+ lanthanide ion nanoparticles (NPs) through a process denominated sol-gel-hydrothermal. According to the pattern of X-ray diffraction, ZnO:Er and ZnO:Yb is formed by a single-phase wurtzite structure with crystallites sized ~65 nm on average, and Er or Yb dopant ions in the hexagonal structure of ZnO, specifically in its distorted lattice sites. The results also suggest the possible role of oxygen vacancies or Ox– (defects) in the energy transfer from ZnO to the Er or Yb ions with a decrease of 3.18 eV and 3.19 eV in bandgap values to a red shift.
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35

Dalhatu, A. S., R. Hussin, B. Ibrahim, Y. A. Yamusa y A. Baballe. "LUMINESCENCE BEHAVIOUR OF DY3+ ION DOPED MAGNESIUM SULFOBORATE PHOSPHOR FOR WHITE LIGHT EMITTING DIODES". Open Journal of Physical Science (ISSN: 2734-2123) 1, n.º 1 (10 de marzo de 2020): 11–15. http://dx.doi.org/10.52417/ojps.v1i1.85.

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Several studies showed the interesting properties of trivalent lanthanide ions when doped in various types of phosphor. Magnesium sulfoborate phosphor doped with different concentrations of Dy3+ were synthesized using solid-state reaction method at 850 °C for 4 hours. The samples were characterized by X-ray Diffraction (XRD). The excitation and luminescence properties of MgO-SO4-B2O3:Dy3+ were determined. The emission spectrum of Dy3+ ion doped MgO-SO4-B2O3 phosphor exhibit three bands at 480 nm, 573 nm and 660 nm with excitation of 386 nm due to 4F9/2 →6H15/2, 6H13/2 and 6H11/2 of Dy3+ transitions, respectively. The excitation spectrum of Dy3+ ion doped MgO-SO4-B2O3 phosphor display several bands at 347 nm, 362 nm, 386 nm, 426 nm, 449 nm and 469 nm with emission of 573 nm, which is in agreement with the ultraviolet LED (349.9–410 nm) and blue LED (450–470 nm). An intense in the emission peak at 573 nm in the yellow region was observed with the 0.5 Dy2O3. The luminescence properties of phosphor show that MgO-SO4-B2O3:Dy3+ phosphor could be potentially used as white LEDs. Dalhatu, A. S. | Department of Physics, Bauchi State University Nigeria, 65 Gadau, Bauchi, Nigeria
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36

Gao, Qi, Shuai Han, Qing Ye, Shuiyuan Cheng, Tianfang Kang y Hongxing Dai. "Effects of Lanthanide Doping on the Catalytic Activity and Hydrothermal Stability of Cu-SAPO-18 for the Catalytic Removal of NOx (NH3-SCR) from Diesel Engines". Catalysts 10, n.º 3 (17 de marzo de 2020): 336. http://dx.doi.org/10.3390/catal10030336.

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Lanthanide (La, Ce, Nd, Gd, Tb, Ho or Lu)-doped Cu-SAPO-18 samples were prepared using the ion-exchange method. Physicochemical properties of the samples were systematically characterized by a number of analytical techniques, and the effects of lanthanide doping on catalytic activity and hydrothermal stability of the Cu-SAPO-18 catalysts for the NH3-SCR reaction were examined. It is shown that the doping of lanthanide elements could affect the interaction between the active components (copper ions) and the AEI-structured SAPO-18 support. The inclusion of some lanthanides significantly slowed down hydrolysis of the catalyst during hydrothermal aging treatment process, leading to an enhanced catalytic activity at both low and high temperatures and hydrothermal stability. In particular, Ce doping promoted the Cu2+ ions to migrate to the energetically favorable sites for enhancement in catalytic activity, whereas the other lanthanide ions exerted little or an opposite effect on the migration of Cu2+ ions. Additionally, Ce doping could improve hydrothermal stability of the Cu-SAPO-18 catalyst by weakening hydrolysis of the catalyst during the hydrothermal aging treatment process. Ce doping increased the catalytic activity of Cu-SAPO-18 at low and high temperatures, which was attributed to modifications of the redox and/or isolated Cu2+ active centers.
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37

Xu, Zhenhe, He Yu, Feixue Ai, Guiyan Zhao, Yanfeng Bi, Liangliang Huang, Fu Ding, Yaguang Sun y Yu Gao. "Large-scale fabrication of porous YBO 3 hollow microspheres with tunable photoluminescence". Royal Society Open Science 5, n.º 4 (abril de 2018): 172186. http://dx.doi.org/10.1098/rsos.172186.

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Hollow lanthanide-doped compounds are some of the most popular materials for high-performance luminescent devices. However, it is challenging to find an approach that can fabricate large-scale and well-crystallized lanthanide-doped hollow structures and that is facile, efficient and of low cost. In this study, YBO 3 : Eu 3+ /Tb 3+ hollow microspheres were fabricated by using a novel multi-step transformation synthetic route for the first time with polystyrene spheres as the template, followed by the combination of a facile homogeneous precipitation method, an ion-exchange process and a calcination process. The results show that the as-obtained YBO 3 : Eu 3+ /Tb 3+ hollow spheres have a uniform morphology with an average diameter of 1.65 µm and shell thickness of about 160 nm. When used as luminescent materials, the emission colours of YBO 3 : Eu 3+ /Tb 3+ samples can be tuned from red, through orange, yellow and green-yellow, to green by simply adjusting the relative doping concentrations of the activator ions under the excitation of ultraviolet light, which might have potential applications in fields such as light display systems and optoelectronic devices.
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38

Wiglusz, R. J., Z. Drulis-Kawa, R. Pazik, K. Zawisza, A. Dorotkiewicz-Jach, J. Roszkowiak y J. M. Nedelec. "Multifunctional lanthanide and silver ion co-doped nano-chlorapatites with combined spectroscopic and antimicrobial properties". Dalton Transactions 44, n.º 15 (2015): 6918–25. http://dx.doi.org/10.1039/c5dt00046g.

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Multifunctional nanocrystalline chlorapatites doped with lanthanide ions (Eu3+, Er3+ and Yb3+) and co-doped with silver ions were synthesized by a hydrothermal synthesis route and studied.
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39

Niu, Wenbin, Suli Wu, Shufen Zhang, Jie Li y Lian Li. "Multicolor output and shape controlled synthesis of lanthanide-ion doped fluorides upconversion nanoparticles". Dalton Transactions 40, n.º 13 (2011): 3305. http://dx.doi.org/10.1039/c0dt01344g.

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40

Niu, Wenbin, Suli Wu, Shufen Zhang y Lian Li. "Synthesis of colour tunable lanthanide-ion doped NaYF4 upconversion nanoparticles by controlling temperature". Chemical Communications 46, n.º 22 (2010): 3908. http://dx.doi.org/10.1039/c002615h.

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41

Isabettini, Stéphane, Sarah Massabni, Joachim Kohlbrecher, Lukas D. Schuler, Peter Walde, Marina Sturm, Erich J. Windhab, Peter Fischer y Simon Kuster. "Understanding the Enhanced Magnetic Response of Aminocholesterol Doped Lanthanide-Ion-Chelating Phospholipid Bicelles". Langmuir 33, n.º 34 (16 de agosto de 2017): 8533–44. http://dx.doi.org/10.1021/acs.langmuir.7b01370.

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42

Chua, Michael y Peter A. Tanner. "Energy transfer and migration in highly forbidden transitions of lanthanide ion doped crystals". Chemical Physics 250, n.º 3 (diciembre de 1999): 267–78. http://dx.doi.org/10.1016/s0301-0104(99)00328-6.

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43

Dugasani, Sreekantha Reddy, Bjorn Paulson, Taewoo Ha, Tae Soo Jung, Bramaramba Gnapareddy, Jang Ah Kim, Taesung Kim et al. "Fabrication and optoelectronic characterisation of lanthanide- and metal-ion-doped DNA thin films". Journal of Physics D: Applied Physics 51, n.º 28 (22 de junio de 2018): 285301. http://dx.doi.org/10.1088/1361-6463/aaca63.

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44

Dugasani, Sreekantha Reddy, Taehyun Hwang, Jang Ah Kim, Bramaramba Gnapareddy, Taesung Kim y Sung Ha Park. "Metal electrode dependent field effect transistors made of lanthanide ion-doped DNA crystals". Journal of Physics D: Applied Physics 49, n.º 10 (8 de febrero de 2016): 105501. http://dx.doi.org/10.1088/0022-3727/49/10/105501.

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45

Tanner, Peter A., Po-Tak Law y Lianshe Fu. "Preformed sol-gel synthesis and characterization of lanthanide ion-doped yttria-alumina materials". physica status solidi (a) 199, n.º 3 (octubre de 2003): 403–15. http://dx.doi.org/10.1002/pssa.200306683.

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46

Yu, Yang, Wei Zhou, Cheng Li, Peigeng Han, Hui Li y Kun Zhao. "Tb3+ and Bi3+ Co-Doping of Lead-Free Cs2NaInCl6 Double Perovskite Nanocrystals for Tailoring Optical Properties". Nanomaterials 13, n.º 3 (29 de enero de 2023): 549. http://dx.doi.org/10.3390/nano13030549.

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Lead halide perovskites have achieved remarkable success in various photovoltaic and optoelectronic applications, especially solar cells and light-emitting diodes (LEDs). Despite the significant advances of lead halide perovskites, lead toxicity and insufficient stability limit their commercialization. Lead-free double perovskites (DPs) are potential materials to address these issues because of their non-toxicity and high stability. By doping DP nanocrystals (NCs) with lanthanide ions (Ln3+), it is possible to make them more stable and impart their optical properties. In this work, a variable temperature hot injection method is used to synthesize lead-free Tb3+-doped Cs2NaInCl6 DP NCs, which exhibit a major narrow green photoluminescence (PL) peak at 544 nm derived from the transition of Tb3+ 5D4→7F5. With further Bi3+ co-doping, the Tb3+-Bi3+-co-doped Cs2NaInCl6 DP NCs are not only directly excited at 280 nm but are also excited at 310 nm and 342 nm. The latter have a higher PL intensity because partial Tb3+ ions are excited through more efficient energy transfer channels from the Bi3+ to the Tb3+ ions. The investigation of the underlying mechanism between the intrinsic emission of Cs2NaInCl6 NCs and the narrow green PL caused by lanthanide ion doping in this paper will facilitate the development of lead-free halide perovskite NCs.
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47

Garcia, John V., Fan Zhang y Peter C. Ford. "Multi-photon excitation in uncaging the small molecule bioregulator nitric oxide". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371, n.º 1995 (28 de julio de 2013): 20120129. http://dx.doi.org/10.1098/rsta.2012.0129.

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Multi-photon excitation allows one to use tissue transmitting near-infrared (NIR) light to access excited states with energies corresponding to single-photon excitation in the visible or ultraviolet wavelength ranges. Here, we present an overview of the application of both simultaneous and sequential multi-photon excitation in studies directed towards the photochemical delivery (‘uncaging’) of bioactive small molecules such as nitric oxide (NO) to physiological targets. Particular focus will be directed towards the use of dyes with high two-photon absorption cross sections and lanthanide ion-doped upconverting nanoparticles as sensitizers to facilitate the uncaging of NO using NIR excitation.
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48

Sujecki, Slawomir, Lukasz Sojka, Angela Seddon, Trevor Benson, Emma Barney, Mario Falconi, Francesco Prudenzano et al. "Comparative Modeling of Infrared Fiber Lasers". Photonics 5, n.º 4 (12 de noviembre de 2018): 48. http://dx.doi.org/10.3390/photonics5040048.

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The modeling and design of fiber lasers facilitate the process of their practical realization. Of particular interest during the last few years is the development of lanthanide ion-doped fiber lasers that operate at wavelengths exceeding 2000 nm. There are two main host glass materials considered for this purpose, namely fluoride and chalcogenide glasses. Therefore, this study concerned comparative modeling of fiber lasers operating within the infrared wavelength region beyond 2000 nm. In particular, the convergence properties of selected algorithms, implemented within various software environments, were studied with a specific focus on the central processing unit (CPU) time and calculation residual. Two representative fiber laser cavities were considered: One was based on a chalcogenide–selenide glass step-index fiber doped with trivalent dysprosium ions, whereas the other was a fluoride step-index fiber doped with trivalent erbium ions. The practical calculation accuracy was also assessed by comparing directly the results obtained from the different models.
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49

Yadav, R. V., S. K. Singh y S. B. Rai. "Effect of the Li+ ion on the multimodal emission of a lanthanide doped phosphor". RSC Advances 5, n.º 33 (2015): 26321–27. http://dx.doi.org/10.1039/c4ra17315e.

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The present study probes the multimodal emission: upconversion, photoluminescence and quantum cutting processes in a Ho3+/Yb3+ co-doped Y2O3 phosphor and further examines the impact of the Li+ ion on the multi-modal emission, for the first time.
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50

Xu, Bing, Dongyu Li, Zhen Huang, Chunliang Tang, Wenhao Mo y Ying Ma. "Alleviating luminescence concentration quenching in lanthanide doped CaF2 based nanoparticles through Na+ ion doping". Dalton Transactions 47, n.º 22 (2018): 7534–40. http://dx.doi.org/10.1039/c8dt00519b.

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