Enhanced green emission from Tb3+–Bi3+ co-doped GdAlO3 nanophosphors

2010 ◽  
Vol 45 (5) ◽  
pp. 572-575 ◽  
Author(s):  
Jin Young Park ◽  
Hong Chae Jung ◽  
G. Seeta Rama Raju ◽  
Byung Kee Moon ◽  
Jung Hyun Jeong ◽  
...  
Keyword(s):  
Green Emission ◽  
Co Doped

scholarly journals Development of Er3+, Yb3+ Co-Doped Y2O3 NPs According to Yb3+ Concentration by LP–PLA Method: Potential Further Biosensor

Biosensors ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 150
Author(s):  
Cheol-Woo Park ◽  
Dong-Jun Park
Keyword(s):  
Pulsed Laser ◽  
Green Emission ◽  
Biological Imaging ◽  
Additive Concentration ◽  
Uniform Size ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Diagnostic Applications ◽  
Ceramic Targets ◽  
Co Doped

As diagnostic biosensors for analyzing fluids from the human body, the development of inorganic NPs is of increasing concern. For one, nanoceramic phosphors have been studied to meet the increasing requirements for biological, imaging, and diagnostic applications. In this study, Y2O3 NPs co-doped with trivalent rare earths (erbium and ytterbium) were obtained using a liquid phase–pulsed laser ablation (LP–PLA) method after getting high density Er, Yb:Y2O3 ceramic targets by Spark plasma sintering (SPS). Most NPs are under 50 nm in diameter and show high crystallinity of cubic Y2O3 structure, containing (222), (440), and (332) planes via HR–TEM. Excitation under a 980 nm laser to a nanoparticle solution showed 525 and 565 nm green, and 660 nm red emissions. The green emission intensity increased and decreased with increasing Yb3+ additive concentration, when the red spectrum continuously strengthened. Utilizing this study’s outcome, we suggest developing technology to mark invisible biomolecules dissolved in a solvent using UC luminescence of Er3+, Yb3+ co-doped Y2O3 NPs by LP–PLA. The LP–PLA method has a potential ability for the fabrication of UC NPs for biosensors with uniform size distribution by laser parameters.

Dazzling green emission from graphene oxide nanosheet-embedded co-doped Ce3+ and Tb3+:PVA polymer nanocomposites for photonic applications

RSC Advances ◽  
2016 ◽  
Vol 6 (59) ◽  
pp. 54525-54538 ◽  
Author(s):  
K. Naveen Kumar ◽  
R. Padma ◽  
J. L. Rao ◽  
Misook Kang
Keyword(s):  
Graphene Oxide ◽  
Energy Transfer ◽  
Polymer Nanocomposites ◽  
Green Emission ◽  
Graphene Oxide Nanosheet ◽  
Uv Excitation ◽  
Co Doped

Novel dazzling green emission has been obtained from graphene oxide nanosheet-embedded Ce3+ and Tb3+:PVA polymer nanocomposites under UV excitation. The green emission of Tb3+ is enhanced by an energy transfer from Ce3+ to Tb3+ and GO NS to Tb3+.

Highly efficient up-conversion green emission in Ho/Yb co-doped yttria-stabilized zirconia single crystals

2019 ◽  
Vol 209 ◽  
pp. 95-101 ◽  
Author(s):  
Xiaojun Tan ◽  
Shoulei Xu ◽  
Fenhong Liu ◽  
Xiangyu Wang ◽  
Bernard A. Goodman ◽  
...  
Keyword(s):  
Single Crystals ◽  
Green Emission ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Highly Efficient ◽  
Co Doped

Structure and Up-Conversion Luminescence Properties of Er3+-Yb3+Co-Doped TiO2 Nanocrystals Prepared by Sol-Gel Method

2009 ◽  
Vol 66 ◽  
pp. 167-170 ◽  
Author(s):  
Zhen Zhong Zhang ◽  
Ji Hong Zhang ◽  
Wei Zhou ◽  
Ming Xia Song ◽  
Wei Li ◽  
...  
Keyword(s):  
Titanium Tetrachloride ◽  
Upconversion Luminescence ◽  
Sol Gel ◽  
Green Emission ◽  
X Ray Diffraction ◽  
Red Emission ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Co Doped

Er3+/Yb3+ co-doped TiO2 nanocrystals were prepared by Sol-gel method in which titanium tetrachloride was adopted as the precursor. The structure, particle size, and optical properties of samples were characterized by X-ray diffraction(XRD), Field emission-Scanning Electron Microscopy(FE-SEM) and photoluminescence(PL) spectra. Er3+ concentration was fixed at 1.0mol%, and Yb3+ concentration was changed from 3 to 10mol%. Intense upconversion luminescence was observed when the samples were excited by 980nm laser. The dependence of upconversion luminescence on Yb3+ concentration was presented. The results show that the upconversion luminescence increases with the Yb3+ concentration and gets its peak at 5%. The ratio of red emission to green emission(R/G) was strikingly enhanced with the increase of Yb3+ concentration. Under the excitation of 980nm, the green emission in the range of 520-570nm (2H11/2, 4S3/2→4I15/2) and the red emission in the range of 640~690nm (4F9/2 →4I15/2) are both due to two photons process. The possible upconversion mechanism was discussed.

Composition-Dependent Ultraviolet up-Conversion Luminescence in Yb3+-Ho3+ Co-Doped Germanium- Phosphate Glasses

2011 ◽  
Vol 266 ◽  
pp. 5-8 ◽  
Author(s):  
Yan Min Yang ◽  
Wei Zhang ◽  
Shan Du ◽  
Zhi Ping Yang
Keyword(s):  
Emission Intensity ◽  
Glass Sample ◽  
Green Emission ◽  
Phosphate Glasses ◽  
Ultraviolet Emission ◽  
Red Emission ◽  
Excitation Mechanisms ◽  
Uv Visible ◽  
Holmium Ion ◽  
Co Doped

Yb3+-Ho3+ co-doped germanium-phosphate glasses have been prepared and characterized for its optical properties through measuring photoluminescence and Raman spectra. UV-visible up-conversion emission of holmium ion in Yb3+-Ho3+ co-doped germanium-phosphate glasses has been observed on 980nm excitation. As phosphate was substituted for germanium the red emission Red I decreased at first and then increased later while the green emission Green I decreased and the ratio of Red I to Green I increased. Interestingly, the value of ultraviolet emission intensity was larger than that of the blue and green emission intensity in phosphate glass sample. We believe that Yb3+-Ho3+ co-doped germanium-phosphate glasses might be a potential host material for developing ultraviolet all–solid compact lasers. The possible excitation mechanisms involved in these emissions were discussed, too.

scholarly journals Bi3+ Effects on Down-/up-conversion Luminescence, Temperature Sensing and Optical Transition Properties in Bi3+/Er3+ Co-doped YNbO4  Phosphors

2020 ◽  
Author(s):  
Xin Wang ◽  
Xiangping Li ◽  
Hongquan Yu ◽  
Sai Xu ◽  
Jiashi Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Transition ◽  
Green Emission ◽  
Radiative Transition ◽  
Solid State Reaction Method ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Luminescence Spectra ◽  
Experimental Values ◽  
Co Doped

Abstract A series of Bi3+ single-doped and Bi3+/Er3+ co-doped YNbO4 phosphors with various concentrations of Bi3+ ions were prepared by a conventional high temperature solid-state reaction method. The results of XRD and Rietveld refinement confirmed that monoclinic phase YNbO4 samples were achieved. The down-/up-conversion luminescence of Er3+ ions were investigated under the excitation of ultraviolet light (327 nm) and near infrared light (980 nm). Under 327 nm excitation, broad visible emission band from Bi3+ ions and characteristic green emission peaks from Er3+ ions were simultaneously observed, while only strong green emissions from Er3+ ions were detected upon excitation of 980 nm. Remarkable emission enhancement was observed in down-/up-conversion luminescence processes by introducing Bi3+ ions into Er3+-doped YNbO4 phosphors. By analyzing the laser working current dependent up-conversion luminescence spectra, two-photon processes were confirmed to be responsible for both the green and the red up-conversion emissions of Er3+ ion. The temperature sensing property of Er3+ was studied by using the temperature dependent up-conversion luminescence spectra and it was found that the temperature sensitivity was sensitive to the doping concentration of Bi3+ ions. By comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er3+ ions and the theoretical values calculated by Judd-Ofelt (J-O) theory, it was concluded that energy level splitting had significant influences on the temperature sensing property of Er3+ ions.

scholarly journals Hydrothermal synthesis of nitrogen and boron doped carbon quantum dots with yellow-green emission for sensing Cr(vi), anti-counterfeiting and cell imaging

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48386-48393 ◽  
Author(s):  
Yongming Guo ◽  
Yuzhi Chen ◽  
Fengpu Cao ◽  
Lijuan Wang ◽  
Zhuo Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Cell Imaging ◽  
Green Emission ◽  
Carbon Quantum Dots ◽  
Fluorometric Detection ◽  
Great Stability ◽  
Boron Doped ◽  
Co Doped

Nitrogen and boron co-doped carbon quantum dots with great stability in high-salt conditions and good photostability are prepared through hydrothermal method and utilized for fluorometric detection of Cr(vi), anti-counterfeiting and cell imaging.

Blue and green emission from Ce3+ and Tb3+ co-doped Y2O3 nanoparticles

2013 ◽  
Vol 140 ◽  
pp. 95-102 ◽  
Author(s):  
Romeo Singh Loitongbam ◽  
W. Rameshwor Singh ◽  
Ganngam Phaomei ◽  
N. Shanta Singh
Keyword(s):  
Green Emission ◽  
Co Doped

Preparation, crystal structure and up-conversion luminescence of Er3+, Yb3+ co-doped Gd2(WO4)3

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73077-73082 ◽  
Author(s):  
Mengyan Yin ◽  
Yangai Liu ◽  
Lefu Mei ◽  
Maxim S. Molokeev ◽  
Zhaohui Huang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Green Emission ◽  
Co Doped

The crystal structure of Er3+ and Yb3+ co-doped Gd2(WO4)3 and the brilliant up-conversion green emission.

Color Locating of Ce3+ and Eu2+ Doped Calcium Magnesium Chlorosilicate UV-LED Phosphors

2011 ◽  
Vol 216 ◽  
pp. 16-20 ◽  
Author(s):  
Quan Shen ◽  
Man Man Lu ◽  
Hai Lin ◽  
Chang Min Li
Keyword(s):  
Green Emission ◽  
Mixed Effect ◽  
Co Doping ◽  
Red Phosphors ◽  
Uv Led ◽  
Bluish Green ◽  
Calcium Magnesium ◽  
Co Doped ◽  
Luminescence Color ◽  
The Ideal

Color coordinates (0.1573, 0.0528) and (0.1542, 0.4663) have been identified in Ce3+and Eu2+singly doped calcium magnesium chlorosilicate (CMSC) phosphors, which present the purplish-blue and green lights under ultraviolet (UV) radiation, respectively. In Ce3+/Eu2+co-doped CMSC phosphors, with sensitizing the green emission of Eu2+, Ce3+co-doping changed the luminescence color from green to bluish-green, presenting a preferable mixed effect from two primary colors. Potential mixture of red phosphors will provide the possibility in achieving the ideal white fluorescence under UV-LED excitation.

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