scholarly journals Microstructure, transmittance and upconversion luminescence of Y2O3:Er3+ translucent ceramics

2020 ◽  
Vol 38 (1) ◽  
pp. 159-164
Author(s):  
Yanyan Guo ◽  
Xinghua Wu ◽  
Qingkai Wang ◽  
Dianyuan Wang
Keyword(s):  
Diode Laser ◽  
Upconversion Luminescence ◽  
Optical Transmittance ◽  
Sintering Aid ◽  
Radiative Transitions ◽  
Upconversion Mechanism

AbstractY2O3:Er3+ translucent ceramics was fabricated with addition of La(OH)3 nanopowder as a sintering aid. The influence of La(OH)3 addition on the microstructure, transmittance and upconversion luminescence of Y2O3:Er3+ ceramics was investigated in detail. The results show that the ceramics sample with 5 mol % La(OH)3 additives exhibits finer microstructure with fewer pores and higher optical transmittance than others. It was proved that La(OH)3 additives could greatly reduce the porosity and improve the transparency of Y2O3:Er3+ ceramics. By using a 980 nm diode laser as a pumping source, the Y2O3:Er3+ ceramics gave bright visible upconversion luminescence, which was ascribed to the radiative transitions of 2H11/2,4S3/2 →4I15/2 and 4F9/2 →4I15/2 of Er3+ ions, respectively. The possible upconversion mechanism has been proposed accordingly.

Room-temperature green to orange color-tunable upconversion luminescence from Yb3+/Mn2+ co-doped CaO

2016 ◽  
Vol 4 (42) ◽  
pp. 10154-10160 ◽  
Author(s):  
J. L. Wang ◽  
E. H. Song ◽  
M. Wu ◽  
W. B. Dai ◽  
X. F. Jiang ◽  
...  
Keyword(s):  
Diode Laser ◽  
Room Temperature ◽  
Doping Concentration ◽  
Laser Excitation ◽  
Upconversion Luminescence ◽  
Color Tunable ◽  
Orange Color ◽  
Co Doped

Room-temperature green to orange color-tunable upconversion is achieved from Yb3+/Mn2+ co-doped CaO by adjusting the doping concentration of Mn2+ ions upon 980 nm diode laser excitation.

Blue Upconversion Luminescence Properties of La2(WO4)3:Yb3+/Tm3+Phosphor

2011 ◽  
Vol 399-401 ◽  
pp. 1020-1025
Author(s):  
Jin Sheng Liao ◽  
Hang Ying You ◽  
Qing Xia Wu ◽  
He Rui Wen ◽  
Jing Lin Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Upconversion Luminescence ◽  
Hydrothermal Process ◽  
Pumping Power ◽  
X Ray Diffraction ◽  
X Ray ◽  
Laser Pumping ◽  
Upconversion Mechanism ◽  
Upconversion Emissions ◽  
Scanning Electron

Monoclinic La2(WO4)3 nanophosphors codoped with Tm3+ and Yb3+ ions were synthesized via hydrothermal process followed by heat treatment. Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize as-prepared samples. The dependences of Yb3+/ concentration and laser pumping power on the upconversion emissions were extensively investigated. The results show that upconversion luminescence increases with the Yb3+/ concentration and gets its peak at 30 %. The upconversion mechanism and process in the Yb3+/Tm3+ codoped La2(WO4)3 phosphors were analysed.

Infrared to Visible Upconversion Luminescence in Yb3+, Ho3+: Y2O3 Nanocrystalline Powders

2005 ◽  
Vol 492-493 ◽  
pp. 95-100 ◽  
Author(s):  
Jian Zhang ◽  
Shi Wei Wang ◽  
Li Qiong An ◽  
Min Liu ◽  
Li Dong Chen
Keyword(s):  
Diode Laser ◽  
Near Infrared ◽  
Continuous Wave ◽  
Upconversion Luminescence ◽  
Green Emission ◽  
Photon Absorption ◽  
Nanocrystalline Powders ◽  
Precipitation Method ◽  
Absorption Mechanism ◽  
Red Emission

Yb3+, Ho3+ co-doped Y2O3 nanocrystalline powders were synthesized via a reverse-strike co-precipitation method using nitrates and ammonia as raw materials. The as-prepared powders are cubic Y2O3 after fired at 7000C for 2 h. Field emission scanning electronic microscopy revealed that most of the particles are nearly spherical and the average diameter of the particles is in the range of 60-80 nm. Under the excitation with a 980 nm continuous wave diode laser, two main emission bands, i.e., green emission centered at 549 nm and red emission centered at 666 nm is observed, respectively. The green emission is attributed to the transition of (5S2, 5F4-5I8) levels of Ho3+; while for the red emission, the transition of 5F5-5I8 levels is suggested. In addition, near infrared emission centered at 755 nm is also detected, corresponding to the transition of (5S2, 5F4-5I7) levels. The dependence of the intensity of upconversion emissions upon the pump power of the diode laser suggests that two-photon absorption mechanism be involved in these processes.

scholarly journals Fabrication of Highly Transparent Y2O3 Ceramics with CaO as Sintering Aid

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 444
Author(s):  
Danlei Yin ◽  
Jun Wang ◽  
Meng Ni ◽  
Peng Liu ◽  
Zhili Dong ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Microstructure Evolution ◽  
Hot Isostatic Pressing ◽  
Optical Transmittance ◽  
Densification Rate ◽  
Vacuum Sintering ◽  
Sintering Aid ◽  
Isostatic Pressing

Highly transparent Y2O3 ceramics were successfully fabricated with CaO as sintering aid. The microstructure evolution, optical transmittance, hardness and thermal conductivity of the Y2O3 ceramics were investigated. It was found that doping a small amount (0.01–0.15 wt.%) of CaO could greatly improve the densification rate of Y2O3. With an optimized CaO dosage of 0.02 wt.% combined with the low temperature vacuum sintering plus hot isostatic pressing (HIP-ing), Y2O3 ceramics with in-line transmittance of 84.87% at 1200 nm and 81.4% at 600 nm were obtained.

Upconversion Luminescence Behaviour of Er3+/Yb3+ Doped MY2O4 (M=Ba, Ca, Sr) Phosphors

2018 ◽  
pp. 117-148
Author(s):  
Vikas Dubey ◽  
Neha Dubey ◽  
Ravi Shrivastava ◽  
Jagjeet KaurSaluja ◽  
Sudipta Som ◽  
...  
Keyword(s):  
Rare Earth ◽  
Data Storage ◽  
Upconversion Luminescence ◽  
Optical Transmittance ◽  
Optical Data Storage ◽  
Optical Data ◽  
High Optical Transmittance ◽  
Potential Applications ◽  
Rare Earth Doped ◽  
Upconversion Process

The upconversion (UC) of the rare earth doped MY2O4 (M=Ba, Sr, Ca) has been extensively investigated due to their potential applications in many fields, such as color display, high density memories, optical data storage, sensor and energy solar cell, etc. Many series of them, especially the Er3+, Yb3+ doped MY2O4 were studied in this chapter, due to the thermal and mechanical toughness, high optical transmittance from the ultraviolet to the infrared regions, and a low nonlinear refractive index compared to the other commercial laser glasses. The energy transfer (ET) mechanism of rare earth doped phosphor plays an important role in the upconversion process.

Sintering of Transparent Polycrystal Nd:YAG with MgO as Additive

2008 ◽  
Vol 368-372 ◽  
pp. 426-428
Author(s):  
Yong Chao Li ◽  
Wang Guo ◽  
Tie Cheng Lu ◽  
Shi Hong Tong ◽  
Rui Xiao Fang ◽  
...  
Keyword(s):  
Grain Growth ◽  
Wavelength Region ◽  
Optical Transmittance ◽  
Precipitation Method ◽  
Vacuum Sintering ◽  
Sintering Aid ◽  
Optimal Weight ◽  
Weight Percentage ◽  
Pure Phase ◽  
Co Precipitation

In this paper, pure phase Nd-doped YAG powders were prepared by co-precipitation method with different amount of MgO (0~ 0.6 wt %) as additive. Transparent Nd:YAG ceramics were fabricated by vacuum sintering at 1750°C for 10 hours using the powders. Microstructure of the surfaces of thermally etched Nd:YAG ceramics was observed by SEM. Transmittance of the transparent Nd:YAG ceramics was measured over the wavelength region from 600nm to1200nm. The results showed that MgO as sintering aid can restrain abnormal grain growth and reduce pores in grains and at the same time, optical transmittance of the ceramics was increased. The optimal weight percentage of MgO added can be determined as 0.3wt % for the fabrication of transparent Nd:YAG ceramics.

Recent Radiative and Collisional Atomic Data of Astrophysical Interest

1988 ◽  
Vol 102 ◽  
pp. 129-132
Author(s):  
K.L. Baluja ◽  
K. Butler ◽  
J. Le Bourlot ◽  
C.J. Zeippen
Keyword(s):  
Mass Production ◽  
Bound States ◽  
Physical Models ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atomic Data ◽  
Isoelectronic Sequence ◽  
Astrophysical Interest ◽  
Radiative Transitions ◽  
Forbidden Transitions

SummaryUsing sophisticated computer programs and elaborate physical models, accurate radiative and collisional atomic data of astrophysical interest have been or are being calculated. The cases treated include radiative transitions between bound states in the 2p4and 2s2p5configurations of many ions in the oxygen isoelectronic sequence, the photoionisation of the ground state of neutral iron, the electron impact excitation of the fine-structure forbidden transitions within the 3p3ground configuration of CℓIII, Ar IV and K V, and the mass-production of radiative data for ions in the oxygen and fluorine isoelectronic sequences, as part of the international Opacity Project.

Microstructural examination of modified yttria stabilized zirconia by EM analytical techniques

1986 ◽  
Vol 44 ◽  
pp. 842-843
Author(s):  
W. W. Davison ◽  
R. C. Buchanan
Keyword(s):  
Mechanical Properties ◽  
Analytical Techniques ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Transmission Microscopy ◽  
Sintering Aid ◽  
Densification Temperature ◽  
Chemical Inertness ◽  
Scanning Transmission ◽  
Microstructural Examination

Yttria stabilized zirconia (YSZ) has become a significant technological material due to its high ionic conductivity, chemical inertness, and good mechanical properties. Temperatures on the order of 1700°C are required, however, to densify YSZ to the degree necessary for good electrical and mechanical properties. A technique for lowering the densification temperature is the addition of small amounts of material which facilitate the formation of a liquid phase at comparatively low temperatures. In this study, sintered microstructures obtained from the use of Al2O3 as a sintering aid were examined with scanning, transmission, and scanning transmission microscopy (SEM, TEM, and STEM).

Infrared diode laser jet spectroscopy of the van der Waals complex (N2O)2

1997 ◽  
Vol 91 (4) ◽  
pp. 689-696 ◽  
Author(s):  
HAI-BO QIAN ◽  
WOUTER HERREBOUT ◽  
BRIAN HOWARD
Keyword(s):  
Diode Laser ◽  
Van Der Waals ◽  
Van Der Waals Complex
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