Functional lanthanide doped upconversion nanocrystals optical properties and mechanism study

... the fine-tuning of optical properties and functionalization of upconversion nanocrystals is presented in the next section Chapter 1.5 Optical properties tuning of upconversion nanocrystals 1.5.1 ... Overview of lanthanide- doped materials 1.2 Introduction of lanthanide- doped nanocrystals .1 1.3 Concept of upconvesion process .3 1.4 Lanthanide- doped upconversion...

Ngày tải lên: 10/09/2015, 09:04

... Planes, L Ma˜ osa, n and A Saxena 80 Micro- and Macro -Properties of Solids Thermal, Mechanical and Dielectric Properties By D.B Sirdeshmukh, L Sirdeshmukh, and K.G Subhadra 87 Micro- and Nanostructured ... understanding and controlling the structure and properties of all important classes of materials 78 Macromolecular Nanostructured Materials Editors: N Ueyama and A Har...

Ngày tải lên: 04/06/2014, 14:28

... observation Optical Properties and Photocatalytic Activity of 1D CdS@ZnS Core-Shell Nanocomposites The optical properties of 1D CdS@ZnS core-shell nanocomposites were measured using UV-vis absorption and ... spectrophotometer and WGY-10 spectrofluorimeter Photocatalytic Decomposition of MB and 4CP To evaluate the photocatalytic activity of the synthesized...

Ngày tải lên: 22/06/2014, 01:20

... Planes, L Ma˜ osa, n and A Saxena 80 Micro- and Macro -Properties of Solids Thermal, Mechanical and Dielectric Properties By D.B Sirdeshmukh, L Sirdeshmukh, and K.G Subhadra 87 Micro- and Nanostructured ... Editors: S Siebentritt and U Rau 94 Magnetic Nanostructures Editors: B Aktas, L Tagirov and F Mikailov 95 Nanocrystals Synthesis, Properties and Applications By C....

Ngày tải lên: 29/06/2014, 09:21

... Synthesis, optical properties and biological imaging of the rare earth complexes with curcumin and pyridine J Mater Chem 2012;22:22774e80 [25] Demas JN, Crosby GA The measurement of photoluminescence ... and SHELXS-97 Göttingen: University of Göttingen; 1997 [21] Zhou HP, Li DM, Zhang JZ, Zhu YM, Wu JY, Hu ZJ, et al Crystal structures, optical properties and theo...

Ngày tải lên: 01/07/2014, 13:22

... OPTICAL PROPERTIES AND EXCITATION DYNAMICS IN 3D AND 2D SYSTEMS CHEN JIANQIANG (M.Sc, NATIONAL UNIVERSITY OF SINGAPORE, SINGAPORE) A THESIS SUBMITTED FOR THE ... J You, G C Xing, T C Sum, S Dhar, Y P Feng, Ariando, Q.-H Xu and T Venkatesan, ―Defect dynamics and spectral observation of twinning in single crystalline LaAlO3 under subbandgap excitation, ‖ ... images...

Ngày tải lên: 10/09/2015, 09:30

... oxide -based functional materials has been observed and continues to expand due to their unique and novel applications Among these functional oxides, zinc oxide (ZnO) has drawn considerable attention ... display applications such as LED As ZnO is an economic, non-toxic and environment-friendly material, the realization of ZnO- based light-emission device may have a significan...

Ngày tải lên: 09/09/2015, 10:15

... asymptotically the value of the band-gap of the undoped Si-nw This is another indication of how doping can modify the electronic and optical properties of the Si nanostructures Conclusions 3.2 3.4 ... systematic analysis of the effect of the B and P codoping in Si-nw, concentrating not only on the structural properties but also on how doping i...

Ngày tải lên: 16/03/2014, 15:15

... models Optical properties of SiNWs and GeNWs In Section of the present paper, we aim to point out the importance of the many-body effects on the optical response of some of the studied nanowires ... [41] Optical gaps in SiNWs and GeNWs: quantum confinement and anisotropy effects In this section, we will describe the electronic properties of hydrogen passivated, free...

Ngày tải lên: 16/03/2014, 15:33

... oxygen and are further oxidized into SnO2 droplets The enhanced absorption and diffusion of tin oxides occurred at SnO2 liquid tip will finally form SnO2 nanowires A typical room-temperature photoluminescence ... of the nanowires follows a self-catalytic VLS process First, SnO2 nanoparticles decomposed into Sn and SnO vapor Sn and SnO vapor subsequently are transported to...

Ngày tải lên: 19/03/2014, 16:48

... arc-lamp, excitation at 275 nm) of the three tungsten oxide nanorod samples of various lengths dissolved in dichloromethane Figure Photoluminescence spectra of tungsten oxide nanorods; 25 ( nm (short), ... micrographs of (a) ( 0.5 nm × 25 ( nm and (b) ( 1.5 nm × 130 ( 30 nm tungsten oxide nanorods Little is known about the photoluminescence of nanostructured tungst...

Ngày tải lên: 20/03/2014, 13:08

Ngày tải lên: 22/03/2014, 11:20

... morphology effects of ZnO pigments on their optical properties The synthesis conditions were according to our previous works [18,19] Typical synthesis conditions of ZnO powders synthesized in this ... concentration of zinc nitrate and potassium hydroxide solutions (Molar) Experimental 2.1 Preparation of pigments ZnO samples were prepared by hydrothermal method and us...

Ngày tải lên: 06/05/2014, 13:23

... and SAED pattern of the sea urchin-like ZnO nanostructures are presented in Fig Fig 2a and b displays the low magnification and high magnification SEM images of the sea urchin-like ZnO nanostructures, ... pattern (a) and UV–visible optical absorption characteristics (b) of the sea urchin-like ZnO nanostructures Fig SEM images (a,b), TEM image (c), HRTEM image (...

Ngày tải lên: 06/05/2014, 13:23