Bright blue cooperative upconversion emission of Yb 3+ from langbeinite K 2 Ti 1.887 Yb 0.113 (PO 4 ) 3 single crystal

2017 ◽  
Vol 188 ◽  
pp. 399-402 ◽  
Author(s):  
S. Sadhasivam ◽  
P. Manivel ◽  
K. Jeganathan ◽  
C.K. Jayasankar ◽  
N.P. Rajesh
Keyword(s):  
Single Crystal ◽  
Upconversion Emission ◽  
Cooperative Upconversion ◽  
Bright Blue

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.

Yb Sensitized Near-Stoichiometric Er:LiNbO3 Single Crystal: A Matrix for Optical Communication and Upconversion Emission

2018 ◽  
Vol 18 (3) ◽  
pp. 1495-1500 ◽  
Author(s):  
Fulei Wang ◽  
Xueliang Kang ◽  
Longyue Liang ◽  
Wei Song ◽  
Dehui Sun ◽  
...  
Keyword(s):  
Single Crystal ◽  
Optical Communication ◽  
Upconversion Emission

Broadband-sensitive cooperative upconversion emission of La(Ga0.5Sc0.5)O3:Er,Ni,Nb

2016 ◽  
Vol 9 (11) ◽  
pp. 112402 ◽  
Author(s):  
Yasuhiko Takeda ◽  
Shintaro Mizuno ◽  
Hom Nath Luitel ◽  
Ken-ichi Yamanaka
Keyword(s):  
Upconversion Emission ◽  
Cooperative Upconversion

Plasmon enhanced upconversion emission in Tm3+/Yb3+/lithium niobate single crystal

2021 ◽  
pp. 150660
Author(s):  
Zhihua Liu ◽  
Yunzhong Zhu ◽  
Wenjia Wang ◽  
Siwei Long ◽  
Shaopeng Lin ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Single Crystal ◽  
Upconversion Emission ◽  
Lithium Niobate Single Crystal

Upconversion luminescence properties and color tunability of 12CaO⋅7Al2O3:Ho3+/Yb3+ single crystal

2016 ◽  
Vol 30 (07) ◽  
pp. 1650083
Author(s):  
Yunfei Qu ◽  
Zhaozhong Qiu ◽  
Rui Wang ◽  
Liang Liu ◽  
Ye Tao ◽  
...  
Keyword(s):  
Single Crystal ◽  
Upconversion Luminescence ◽  
Czochralski Method ◽  
Upconversion Emission ◽  
Excitation Power ◽  
Luminescence Decay ◽  
Two Photon ◽  
Photon Process ◽  
Multicolor Display ◽  
Application Prospects

Rear earth (RE) ions-doped 12CaO[Formula: see text]7Al2O3 single crystal has been successfully prepared by Czochralski method. Under 980 nm excitation, a strong green upconversion emission at 548 nm and a weaker red upconversion emission at 662 nm were observed. The green upconversion emission is corresponding to the transition of 5F 4/5S[Formula: see text]I8 of Ho[Formula: see text], and the red one is corresponding to the transition of 5F[Formula: see text]I8 of Ho[Formula: see text]. A much weaker NIR band at 762 nm is also observed, which corresponds to the 5F 4/5S[Formula: see text]I7 transition of Ho[Formula: see text]. The pump dependence and luminescence decay dynamics spectra show the green and red upconversion are populated by two-photon process, and the upconversion mechanisms are analyzed in detail. The color of the upconversion luminescence can be changed by simply adjusting the excitation power. RE ions-doped 12CaO[Formula: see text]7Al2O3 single crystal with these properties is expected to have broad application prospects in solid-state multicolor display and instrument integration. RE ions-doped 12CaO[Formula: see text]7Al2O3 single crystal has the ability to replace some traditional single crystals such as LiNbO3 in many applications.

A Preparation of High Resolution Standards for Electron Microscopy. Part II

1971 ◽  
Vol 29 ◽  
pp. 160-161
Author(s):  
Akira Tanaka ◽  
David F. Harling
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Carbon Black ◽  
Single Crystal ◽  
Dark Field ◽  
Graphitized Carbon Black ◽  
Graphitized Carbon ◽  
Dark Field Imaging ◽  
Crystal Films ◽  
Micro Holes

In the previous paper, the author reported on a technique for preparing vapor-deposited single crystal films as high resolution standards for electron microscopy. The present paper is intended to describe the preparation of several high resolution standards for dark field microscopy and also to mention some results obtained from these studies. Three preparations were used initially: 1.) Graphitized carbon black, 2.) Epitaxially grown particles of different metals prepared by vapor deposition, and 3.) Particles grown epitaxially on the edge of micro-holes formed in a gold single crystal film.The authors successfully obtained dark field micrographs demonstrating the 3.4Å lattice spacing of graphitized carbon black and the Au single crystal (111) lattice of 2.35Å. The latter spacing is especially suitable for dark field imaging because of its preparation, as in 3.), above. After the deposited film of Au (001) orientation is prepared at 400°C the substrate temperature is raised, resulting in the formation of many square micro-holes caused by partial evaporation of the Au film.

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

Dislocations, Ordering and Antiferromagnetic Domains in MnO

1970 ◽  
Vol 28 ◽  
pp. 522-523
Author(s):  
D. J. Barber ◽  
R. G. Evans
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Optical Microscopy ◽  
Defect Chemistry ◽  
Magnetic Structures ◽  
Optically Transparent ◽  
Magnetic Features ◽  
Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

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