Enhanced high-order ultraviolet upconversion luminescence in sub-20 nm β-NaYbF4:0.5% Tm nanoparticles via Fe3+doping

CrystEngComm ◽  
2017 ◽  
Vol 19 (9) ◽  
pp. 1304-1310 ◽  
Author(s):  
Yanting Zhang ◽  
Yingli Shen ◽  
Miao Liu ◽  
Yu Han ◽  
Xiulan Mo ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
High Order ◽  
20 Nm

Upconversion-luminescent/magnetic dual-functional sub-20 nm core–shell SrF2:Yb,Tm@CaF2:Gd heteronanoparticles

2016 ◽  
Vol 45 (13) ◽  
pp. 5800-5807 ◽  
Author(s):  
Ai-Hua Li ◽  
Mengyun Lü ◽  
Jun Yang ◽  
Lin Chen ◽  
Xiaohong Cui ◽  
...  
Keyword(s):  
High Efficiency ◽  
Upconversion Luminescence ◽  
Water Soluble ◽  
Core Shell ◽  
Dual Functional ◽  
Magnetic Shell ◽  
20 Nm

Combination of a high-efficiency upconversion luminescence core with a biocompatible magnetic shell endows hydrothermal-synthesized water-soluble nanoparticles with improved dual-modal bioimaging capabilities.

Giant enhancements of high-order upconversion luminescence enabled by multi-resonant hyperbolic metamaterials

2021 ◽  
Author(s):  
Zhangkai Zhou ◽  
Haofei Xu ◽  
Zhimin Zhu ◽  
Jiancai Xue ◽  
Qiuqiang zhan ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
High Order ◽  
Hyperbolic Metamaterials

High order field-to-field corrections for imaging and overlay to achieve sub 20-nm lithography requirements

2013 ◽  
Author(s):  
Jan Mulkens ◽  
Michael Kubis ◽  
Paul Hinnen ◽  
Roelof de Graaf ◽  
Hans van der Laan ◽  
...  
Keyword(s):  
High Order ◽  
20 Nm ◽  
High Order Field

Sub-10 nm and monodisperse β-NaYF4:Yb,Tm,Gd nanocrystals with intense ultraviolet upconversion luminescence

2014 ◽  
Vol 2 (12) ◽  
pp. 2198-2203 ◽  
Author(s):  
Feng Shi ◽  
Yue Zhao
Keyword(s):  
Upconversion Luminescence ◽  
High Order ◽  
Core Shell ◽  
Upconversion Nanocrystals

Lanthanide-doped upconversion nanocrystals of β-NaYF4:18%Yb,0.5%Tm,X%Gd and core–shell structured β-NaYF4:18%Yb,0.5%Tm,20%Gd@NaGdF4 as small as 8 nm and 12 nm in diameter respectively were synthesized. They display intense and high-order ultraviolet (UV) emissions upon 980 nm excitation.

Macromolecular structures of biological specimens are not obscured by controlled osmium impregnation

1983 ◽  
Vol 41 ◽  
pp. 606-607
Author(s):  
Klaus-Ruediger Peters ◽  
Samuel A. Green
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Critical Point ◽  
Metal Films ◽  
High Magnification ◽  
Osmium Impregnation ◽  
Instrumental Resolution ◽  
20 Nm ◽  
Continuous Metal

High magnification imaging of macromolecules on metal coated biological specimens is limited only by wet preparation procedures since recently obtained instrumental resolution allows visualization of topographic structures as smal l as 1-2 nm. Details of such dimensions may be visualized if continuous metal films with a thickness of 2 nm or less are applied. Such thin films give sufficient contrast in TEM as well as in SEM (SE-I image mode). The requisite increase in electrical conductivity for SEM of biological specimens is achieved through the use of ligand mediated wet osmiuum impregnation of the specimen before critical point (CP) drying. A commonly used ligand is thiocarbohvdrazide (TCH), first introduced to TEM for en block staining of lipids and glvcomacromolecules with osmium black. Now TCH is also used for SEM. However, after ligand mediated osinification nonspecific osmium black precipitates were often found obscuring surface details with large diffuse aggregates or with dense particular deposits, 2-20 nm in size. Thus, only low magnification work was considered possible after TCH appl ication.

A scanning electron microscopic study of the veliger larvae of the scallop argopecten purpuratus

1988 ◽  
Vol 46 ◽  
pp. 284-285
Author(s):  
G.C. Bellolio ◽  
K.S. Lohrmann ◽  
E.M. Dupré
Keyword(s):  
Morphological Description ◽  
Electron Microscopic ◽  
Larval Stages ◽  
Scanning Electron Microscopic Study ◽  
The Pacific ◽  
Argopecten Purpuratus ◽  
Veliger Larvae ◽  
20 Nm ◽  
Ethanol Series ◽  
Scanning Electron

Argopecten purpuratus is a scallop distributed in the Pacific coast of Chile and Peru. Although this species is mass cultured in both countries there is no morphological description available of the development of this bivalve except for few characterizations of some larval stages described for culture purposes. In this work veliger larvae (app. 140 pm length) were examined by the scanning electron microscope (SEM) in order to study some aspects of the organogenesis of this species.Veliger larvae were obtained from hatchery cultures, relaxed with a solution of MgCl2 and killed by slow addition of 21 glutaraldehyde (GA) in seawater (SW). They were fixed in 2% GA in calcium free artificial SW (pH 8.3), rinsed 3 times in calcium free SW, and dehydrated in a graded ethanol series. The larvae were critical point dried and mounted on double scotch tape (DST). To permit internal view, some valves were removed by slightly pressing and lifting the tip of a cactus spine wrapped with DST, The samples were coated with 20 nm gold and examined with a JEOL JSM T-300 operated at 15 KV.

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