Tailoring of structural and photoluminescence emissions by Mn and Cu co-doping in 2D nanostructures of ZnS for the visualization of latent fingerprints and generation of white light

Nanoscale ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 2017-2026 ◽  
Author(s):  
Partha Kumbhakar ◽  
Subrata Biswas ◽  
Prafull Pandey ◽  
Chandra S. Tiwary ◽  
Pathik Kumbhakar
Keyword(s):  
White Light ◽  
Latent Fingerprints ◽  
Co Doping ◽  
The One ◽  
Co Doped ◽  
Zns Nanosheets

The “one-stone-two-birds” model for the simultaneous tuning of morphology and luminescence in Mn–Cu co-doped ZnS nanosheets for the detection of latent fingerprints.

Dual-mode upconversion and downshifting white-light emitting Ln3+:Gd2W2O9 materials

2018 ◽  
Vol 42 (4) ◽  
pp. 2393-2400 ◽  
Author(s):  
Jing Liu ◽  
Elena Quinteiro González ◽  
Anna M. Kaczmarek ◽  
Rik Van Deun
Keyword(s):  
White Light ◽  
Light Emission ◽  
Upconversion Luminescence ◽  
White Light Emission ◽  
Dual Mode ◽  
Light Emitting ◽  
Co Doping ◽  
Two Samples ◽  
Synthesized Materials ◽  
Co Doped

Both approaches (mixing two samples and co-doping with all the lanthanides) yielded materials which showed nearly identical downshifting white-light emission, while significantly different upconversion luminescence was obtained for the mixed powders and the co-doped synthesized materials.

Influence of Co-Doping on the Sintering Map of an Ultra Fine and Ultra Pure Alpha Alumina Powder

2006 ◽  
Vol 45 ◽  
pp. 55-60 ◽  
Author(s):  
Guillaume Bernard-Granger ◽  
Christian Guizard
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Liquid Phase ◽  
Transient Liquid Phase ◽  
Alumina Powder ◽  
Co Doping ◽  
Transmission Electron ◽  
The One ◽  
Alpha Alumina ◽  
Co Doped

The sintering map of an ultra fine and ultra pure α-alumina powder, doped with MO and DO2 (M for mono-valence cations, D for bi-valence cations), has been built from isothermal sintering experiments. It has been compared with the one obtained in a previous study with the same un-doped α-alumina raw powder. It seems that a transient liquid phase appears above a critical temperature in the co-doped material during sintering. It is proposed that this transient liquid phase is promoting densification and minimizing grain growth, as confirmed by transmission electron microscopy (TEM).

scholarly journals Warm-white luminescence of Dy3+ and Sm3+ co-doped NaSrPO4 phosphors through energy transfer between Dy3+ and Sm3+ ions

2021 ◽  
Author(s):  
Wen Yan ◽  
Junhan Li ◽  
Wentao Zhang ◽  
Xi Gao ◽  
Peicong Zhang
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Sol Gel ◽  
Synthesis Temperature ◽  
Dipole Transition ◽  
Efficient Energy Transfer ◽  
Light Emitting ◽  
Co Doping ◽  
Warm White Light ◽  
Co Doped

Abstract Series of white-light-emitting NaSrPO4:Dy3+ phosphors were synthesized via a sol-gel method. Small amounts of Sm3+ ions were co-doped into the phosphors to enhance their luminescence. The effects of Dy3+/Sm3+ co-doping concentrations and synthesis temperature on the phosphors’ structures and luminescence properties were investigated. The results of X-ray diffraction confirmed that the characteristic diffraction peaks of the phosphors were in accord with those of the standard NaSrPO4 structure. Energy dispersive spectroscopy indicated that the NaSrPO4:Dy3+ samples were prepared with stoichiometric ratios of elements. Under ultraviolet light excitation of 348 nm, the NaSrPO4:Dy3+ phosphors emitted a white light which was composed of two emission peaks at 484 nm (blue) and 577 nm (yellow) corresponding to the magnetic dipole transition 4F9/2 → 6H15/2 and electronic dipole transition 4F9/2 → 6H13/2 of Dy3+ ions, respectively. Based on Sm3+ co-doping, a characteristic red emission at 602 nm arose and a warm-white light containing a lower CCT value was obtained. Besides, the luminescence lifetime of Dy3+ decreased while that of Sm3+ increased as dosages of Sm3+ were added, indicating efficient energy transfer from Dy3+ to Sm3+ happened. Therefore, NaSrPO4:Dy3+, Sm3+ phosphors are promising candidates for application in warm-white light-emitting diodes.

scholarly journals Luminescence of Tb3Al5O12 phosphors co-doped with Ce3+/Gd3+ for white light-emitting diodes

2019 ◽  
Vol 10 ◽  
pp. 1237-1242 ◽  
Author(s):  
Yu-Guo Yang ◽  
Lei Wei ◽  
Jian-Hua Xu ◽  
Hua-Jian Yu ◽  
Yan-Yan Hu ◽  
...  
Keyword(s):  
White Light ◽  
Emission Band ◽  
Light Emitting Diodes ◽  
Solid State Reactions ◽  
Peak Wavelength ◽  
Light Emitting ◽  
Co Doping ◽  
Characteristic Emission ◽  
White Light Emitting Diodes ◽  
Co Doped

Tb2.96− x Ce0.04GdxAl5O12 phosphors were synthesized through solid-state reactions. The influence of Gd3+ on the luminescence was investigated. Under the excitation at 460 nm, Tb2.96Ce0.04Al5O12 shows the characteristic emission band of Ce3+ with a peak wavelength at about 554 nm. After co-doping Gd3+ into Tb2.96Ce0.04Al5O12, the peak wavelength of the Ce3+ emission band shifts to longer wavelengths, which is induced by the increasing crystal field splitting. However, the Ce3+ emission intensity also decreases because the substitution of Tb3+ with Gd3+ causes lattice deformation and generates numerous structural and chemical defects. By comparing the light parameters of white light-emitting diodes (WLEDs) containing Y2.96Ce0.04Al5O12, Tb2.96Ce0.04Al5O12 and Tb2.81Ce0.04Gd0.15Al5O12 phosphors, we can find that the WLED containing the Tb2.81Ce0.04Gd0.15Al5O12 phosphor generates warmer light than the WLEDs containing Y2.96Ce0.04Al5O12 and Tb2.96Ce0.04Al5O12 phosphors. Moreover, the WLEDs fabricated by integrating a blue LED chip and Ce3+/Gd3+-co-doped Tb3Al5O12 phosphors show outstanding colour stability when driven under different currents.

Promoting Hydrogen Evolution of g-C3N4 Based Photocatalyst by Indium and Phosphorus Co-doping

2021 ◽  
Author(s):  
Xiao-Hang Yang ◽  
Chi Cao ◽  
Zilong Guo ◽  
Xiaoyu Zhang ◽  
Yaxin Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Post Treatment ◽  
Experimental Results ◽  
Indium Chloride ◽  
Co Doping ◽  
In Situ Copolymerization ◽  
Co Doped

Indium and phosphorus co-doped g-C3N4 photocatalyst (In,P-g-C3N4) was prepared by K2HPO4 post-treatment of indium doped g-C3N4 photocatalyst (In-g-C3N4) derived from in-situ copolymerization of dicyandiamide and indium chloride. The experimental results...

scholarly journals Cobalt-doped bioceramic scaffolds fabricated by 3D printing show enhanced osteogenic and angiogenic properties for bone repair

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Jungang Li ◽  
Chaoqian Zhao ◽  
Chun Liu ◽  
Zhenyu Wang ◽  
Zeming Ling ◽  
...  
Keyword(s):  
Compressive Strength ◽  
3D Printing ◽  
Bone Regeneration ◽  
Doping Concentration ◽  
Artificial Bone ◽  
Bone Defect Repair ◽  
Co Doping ◽  
Defect Repair ◽  
Co Doped

Abstract Background The bone regeneration of artificial bone grafts is still in need of a breakthrough to improve the processes of bone defect repair. Artificial bone grafts should be modified to enable angiogenesis and thus improve osteogenesis. We have previously revealed that crystalline Ca10Li(PO4)7 (CLP) possesses higher compressive strength and better biocompatibility than that of pure beta-tricalcium phosphate (β-TCP). In this work, we explored the possibility of cobalt (Co), known for mimicking hypoxia, doped into CLP to promote osteogenesis and angiogenesis. Methods We designed and manufactured porous scaffolds by doping CLP with various concentrations of Co (0, 0.1, 0.25, 0.5, and 1 mol%) and using 3D printing techniques. The crystal phase, surface morphology, compressive strength, in vitro degradation, and mineralization properties of Co-doped and -undoped CLP scaffolds were investigated. Next, we investigated the biocompatibility and effects of Co-doped and -undoped samples on osteogenic and angiogenic properties in vitro and on bone regeneration in rat cranium defects. Results With increasing Co-doping level, the compressive strength of Co-doped CLP scaffolds decreased in comparison with that of undoped CLP scaffolds, especially when the Co-doping concentration increased to 1 mol%. Co-doped CLP scaffolds possessed excellent degradation properties compared with those of undoped CLP scaffolds. The (0.1, 0.25, 0.5 mol%) Co-doped CLP scaffolds had mineralization properties similar to those of undoped CLP scaffolds, whereas the 1 mol% Co-doped CLP scaffolds shown no mineralization changes. Furthermore, compared with undoped scaffolds, Co-doped CLP scaffolds possessed excellent biocompatibility and prominent osteogenic and angiogenic properties in vitro, notably when the doping concentration was 0.25 mol%. After 8 weeks of implantation, 0.25 mol% Co-doped scaffolds had markedly enhanced bone regeneration at the defect site compared with that of the undoped scaffold. Conclusion In summary, CLP doped with 0.25 mol% Co2+ ions is a prospective method to enhance osteogenic and angiogenic properties, thus promoting bone regeneration in bone defect repair.

Transport mechanisms in Co-doped ZnO (ZCO) and H-irradiated ZCO polycrystalline thin films

2021 ◽  
Vol 23 (3) ◽  
pp. 2368-2376
Author(s):  
A. Di Trolio ◽  
A. Amore Bonapasta ◽  
C. Barone ◽  
A. Leo ◽  
G. Carapella ◽  
...  
Keyword(s):  
Thin Films ◽  
Opposite Effect ◽  
Transport Mechanisms ◽  
Co Doping ◽  
Polycrystalline Thin Films ◽  
Doped Zno ◽  
Co Doped

Co doping increases the ZnO resistivity (ρ) at high T (HT), whereas it has an opposite effect at low T (LT). H balances the Co effects by neutralizing the ρ increase at HT and strengthening its decrease at LT.

Realization of warm white light and energy transfer studies of Dy3+/Eu3+ co-doped Li2O-PbO-Al2O3-B2O3 glasses for lighting applications

2020 ◽  
Vol 222 ◽  
pp. 117166 ◽  
Author(s):  
Nisha Deopa ◽  
Mukesh K. Sahu ◽  
P.R. Rani ◽  
R. Punia ◽  
A.S. Rao
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Warm White Light ◽  
Co Doped

Tunable White-Light Emission of Co2+ and Mn2+ Co-Doped ZnS Nanoparticles by Energy Transfer between Dopant Ions

2020 ◽  
Vol 124 (6) ◽  
pp. 3857-3866 ◽  
Author(s):  
G. Saavedra-Rodriguez ◽  
U. Pal ◽  
R. Sánchez-Zeferino ◽  
M. E. Álvarez-Ramos
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Light Emission ◽  
White Light Emission ◽  
Zns Nanoparticles ◽  
Co Doped

scholarly journals Photo-activity and low resistivity in N/Nb Co-doped TiO2 thin films by combinatorial AACVD

2016 ◽  
Vol 4 (2) ◽  
pp. 407-415 ◽  
Author(s):  
Nicholas P. Chadwick ◽  
Emily N. K. Glover ◽  
Sanjayan Sathasivam ◽  
Sulaiman N. Basahel ◽  
Shaeel A. Althabaiti ◽  
...  
Keyword(s):  
Thin Films ◽  
Functional Properties ◽  
Tio2 Thin Films ◽  
Doped Tio2 ◽  
Low Resistivity ◽  
Co Doping ◽  
Co Doped

Combinatorial AACVD has achieved the production of various niobium/nitrogen co-doped TiO2 materials in a single film. The co-doping concentrations have been correlated with functional properties.

Sign in / Sign up

Export Citation Format

Share Document