Anomalous laser deflection phenomenon based on the interaction of electro-optic and graded refractivity effects in Cu-doped KTa1−xNbxO3 crystal

Abstract

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Controllable synthesis and luminescence of YPO4:Ln3+ (Ln = Eu and Sm) nanotubes

“…and YPO 4 :Sm 3? , the strong absorption band peaking at 232 nm corresponds to the charge transfer from the oxygen ligands to the central phosphorus atom inside the PO 4 3-absorption. It also can be seen that the excitation band peaking at 232 nm is broader than that of Eu 3?…”

“…ions will combine with the SDS molecules. After the addition of (NH 4 ) 2 HPO 4 , there will be a competition between the negative groups of SDS molecules and PO 4 3-groups. Under the pH value of 9, YPO 4 is more stable, which induces the formation of the crystalline nuclei of YPO 4 :-Eu 3?…”

“…In the excitation spectrum monitoring emission at 594 nm, there are strong band peaking at 232 nm and several of weak bands in the range of 275-475 nm. The strong band peaking at 232 nm corresponds to the charge transfer (CTB) from the oxygen ligands to the central phosphorus atom inside the PO 4 3-absorption. Other weak bands ranging from 275 to 475 nm originate from the f-f transitions of Eu 3?…”

“…In recent years, inorganic materials play a more and more important role in fields of photocatalysis [1,2], electrooptic devices [3,4], solar cells [5], and so on. And inorganic luminescence materials/phosphors have been used in fields of light-emitting diode (LED), fluorescent tubes, field emission displays, computed tomography, and so on [6].…”

“…Lanthanide compounds have been used widely as phosphors for high-performance luminescent devices, magnets, catalysts, time-resolved fluorescence labels for biological detection, and other functional materials based on the optoelectronic and chemical characteristics resulting from the 4f shell of their ions, such as YPO 4 [18], LaPO 4 [7], TbPO 4 [19]. As one of important lanthanide compounds, YPO 4 is a promising host candidate for rare earth ions activated luminescent materials because of its excellent thermal and chemical stability.…”