Phosphor (Energy Converter)
Inorganic phosphor materials
“Classical” inorganic phosphors usually consist of a host lattice with activator ions doped into it in small concentrations, typically a few mole percent or less.
Host lattice & Activator ion
1st type : weak interaction (Ln3+)
2nd type: strong interaction ( Mn2+, Eu2+, Ce3+, Pb2+,Sb3+, Ce3+, MoO42-, NbO43-)
Activator (+ Sensit
1. Nanorods
of the reported procedures for rod formation, seedmediated growth has been by far the most efficient and popular approach. The role played by the seed particle is also critical. Furthermore, the presence of small amounts or silver nitrate during the synthesis has a dramatic effect on the final shape and crystalline structure if the particles. Citrate-capped gold nanoparticle, prepare
nanostructure with lengths of several decade microns. The high-magnification images of single ZnO nanostructure in Fig. 1(d) and (e) reveal that they are composed of central axial nanowires surrounded by radially oriented nanorods with 6-fold structural symmetry. Fig. 1(f) shows the side-wall image of hierarchical ZnO nanostructure with widths of 70–-120 nm and average length of around 600
The ZnO and ZnMgO nanostructures were grown on silicon substrates at different temperatures, using gold metal as a catalyst in the presence of argon as a carrier gas in a conventional tube furnace.
The effects of the substrate temperatures, gold catalyst, and source material preparation on the morphological and optical properties of the nanostructures were investigated.
Si substrates were c
∙ ZnO is an good candidate for fabrication of optoelectronic
and electronic device.
∙ 1D ZnO nanostructures have many properties.
∙ It is that a simple two-step thermal evaporation process
to synthesize the hierarchical pure ZnO nanostructures of 6-fold structural symmetry without any metal catalyst.
∙ Pure zinc powder(99.99%)