Enhanced upconversion emission in ZrO2–Al2O3 composite oxide

2016 ◽  
Vol 45 (15) ◽  
pp. 6627-6633 ◽  
Author(s):  
Yan Cong ◽  
Bin Dong ◽  
Naisen Yu ◽  
Yangyang He ◽  
Ying Zhao ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Upconversion Emission ◽  
Significant Enhancement ◽  
Composite Oxide ◽  
Al2o3 Composite

Significant enhancement of the UC emission in ZrO2–Al2O3 solid solutions samples was obtained compared to the pristine oxide samples—ZrO2 and Al2O3.

Significant enhancement of visible up-conversion emissions of Y2O2S:Er3+ phosphors by Mn2+ sensitizing under 1550 nm excitation

RSC Advances ◽  
2014 ◽  
Vol 4 (32) ◽  
pp. 16710-16715 ◽  
Author(s):  
Shuanglong Yuan ◽  
Huidan Zeng ◽  
Xuanshun Wu ◽  
Zhao Liu ◽  
Jing Ren ◽  
...  
Keyword(s):  
Emission Intensity ◽  
Upconversion Emission ◽  
Significant Enhancement

Significant enhancement of the upconversion emission intensity of Y2O2S:Er3+ was achieved by Mn2+ sensitizing under 1550 nm excitation.

scholarly journals Near-infrared excited luminescence and in vitro imaging of HeLa cells by using Mn2+ enhanced Tb3+ and Yb3+ cooperative upconversion in NaYF4 nanocrystals

2019 ◽  
Vol 1 (9) ◽  
pp. 3463-3473 ◽  
Author(s):  
Katarzyna Prorok ◽  
Michał Olk ◽  
Michał Skowicki ◽  
Agnieszka Kowalczyk ◽  
Agata Kotulska ◽  
...  
Keyword(s):  
Hela Cells ◽  
Emission Intensity ◽  
Near Infrared ◽  
Upconversion Emission ◽  
Significant Enhancement ◽  
New Approach ◽  
Co Doping ◽  
Cooperative Upconversion ◽  
Excited Luminescence

To improve the Tb3+ upconversion emission intensity, a new approach, i.e. Mn2+ co-doping, has been proposed and verified in this work. The significant enhancement of the emission intensity as a result of the introduction of Mn2+ ions was observed.

Preparation and characterization of Nb2O5–Al2O3 composite oxide formed by cathodic electroplating and anodizing

2011 ◽  
Vol 176 (18) ◽  
pp. 1505-1508 ◽  
Author(s):  
Joo-Hee Jang ◽  
Tae-Yoo Kim ◽  
Nam-Jeong Kim ◽  
Chang-Hyoung Lee ◽  
Eun-Mi Park ◽  
...  
Keyword(s):  
Composite Oxide ◽  
Al2o3 Composite

scholarly journals Gd3+-Doping Effect on Upconversion Emission of NaYF4: Yb3+, Er3+/Tm3+ Microparticles

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3397
Author(s):  
Aleksandra A. Vidyakina ◽  
Ilya E. Kolesnikov ◽  
Nikita A. Bogachev ◽  
Mikhail Y. Skripkin ◽  
Ilya I. Tumkin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Hydrothermal Method ◽  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Upconversion Emission ◽  
Size Reduction ◽  
Significant Enhancement ◽  
Partial Substitution ◽  
Luminescence Spectra ◽  
Co Doped

β-NaYF4 microcrystals co-doped with Yb3+, Er3+/Tm3+, and Gd3+ ions were synthesized via a hydrothermal method using rare-earth chlorides as the precursors. The SEM and XRD data show that the doped β-NaYF4 form uniform hexagonal prisms with an approximate size of 600–800 nm. The partial substitution of Y by Gd results in size reduction of microcrystals. Upconversion luminescence spectra of microcrystals upon 980 nm excitation contain characteristic intra-configurational ff bands of Er3+/Tm3+ ions. An addition of Gd3+ ions leads to a significant enhancement of upconversion luminescence intensity with maxima at 5 mol % of dopant.

The performance of Co/ZrO2–Al2O3 composite oxide catalyst for CH4/CO2 reforming reaction

2015 ◽  
Vol 40 (32) ◽  
pp. 10026-10032 ◽  
Author(s):  
Xiaohong Zhang ◽  
Ruijue Hu ◽  
Yafeng Liu ◽  
Jianwen Zhao ◽  
Lina Hou ◽  
...  
Keyword(s):  
Oxide Catalyst ◽  
Co2 Reforming ◽  
Composite Oxide ◽  
Al2o3 Composite

Visual Spatial Attention in Migraine Sufferers in Postictal and Interictal Phases: An Event-Related Potential Study

2001 ◽  
Vol 15 (1) ◽  
pp. 22-34 ◽  
Author(s):  
D.H. de Koning ◽  
J.C. Woestenburg ◽  
M. Elton
Keyword(s):  
Cerebral Cortex ◽  
Visual Attention ◽  
Migraine Attack ◽  
Spatial Attention ◽  
Event Related Potential ◽  
Significant Enhancement ◽  
Pathophysiological Mechanism ◽  
Attention Task ◽  
Visual Spatial Attention ◽  
Visual Spatial

Migraineurs with and without aura (MWAs and MWOAs) as well as controls were measured twice with an interval of 7 days. The first session of recordings and tests for migraineurs was held about 7 hours after a migraine attack. We hypothesized that electrophysiological changes in the posterior cerebral cortex related to visual spatial attention are influenced by the level of arousal in migraineurs with aura, and that this varies over the course of time. ERPs related to the active visual attention task manifested significant differences between controls and both types of migraine sufferers for the N200, suggesting a common pathophysiological mechanism for migraineurs. Furthermore, migraineurs without aura (MWOAs) showed a significant enhancement for the N200 at the second session, indicating the relevance of time of measurement within migraine studies. Finally, migraineurs with aura (MWAs) showed significantly enhanced P240 and P300 components at central and parietal cortical sites compared to MWOAs and controls, which seemed to be maintained over both sessions and could be indicative of increased noradrenergic activity in MWAs.

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