Papers by Author: Yu Guang Lv

Abstract: Tb (AUFA)₃2H₂O, a rare earth terbium complex,was synthesized by introducing 4-(11-azobenzene-undecyloxy) ferrocene acid (AUFA) as the ligand. This complex was characterized by elemental analysis, MS, IR, Raman, UV spectroscopy and fluorescence spectrophotometry. The complex exhibited ligand-sensitized green emission, and Tb (AUFA)₃2H₂O had a higher sensitized luminescence efficiency and a longer lifetime than the other terbium complexes (DPC: 2, 6-Pyridinedicarboxylic acid, Aspirin: 2-ethanoylhydroxybenzoic acid). The organic-inorganic thin film of complexe Tb (AUFA)₃2H₂O in nanoTiO₂ was fabricated, and the nanoTiO₂ has been used in the luminescence layer to change the luminescence property of complexes Tb (AUFA)₃2H₂O. It was found that there was an efficient energy transfer process between the ligands and metal ions. Moreover, In an ITO/PVK/Tb (AUFA)₃2H₂O/Al device, Tb³⁺ may be excited by intramolecular energy transfer from the ligand, as observed by electroluminescence. The main emitting peak at 545 nm can be attributed to the ⁵D₄→⁷F₅ transition of the Tb³⁺ ion, and this process results in the enhancement of the green emission from the electroluminescence device.

Abstract: In this paper, a rare earth metal terbium ion as the central metal ion, a nanohydroxyapatite powder of the lanthanum doped terbium was synthesis by precipitation with hydroxyapatite as ligand. The sample was characterized by infrared spectrum, fluorescence spectrum and X ray diffraction instrument, and the thermal properties and fluorescence properties, structure of powderes were discussed. A nanohydroxyapatite powder of the lanthanum doped terbium achieves the maximum luminous intensity, when the La³⁺ doping concentration of Tb³⁺ was HAP 5% (La³⁺ and Tb³⁺ mole fraction ratio) devices. Rare earth powder of the lanthanum doped terbium hydroxyapatite has the stability chemical properties, the luminescence properties and good biological activity, the rare earth powder has good luminescent properties can be used in preparation of a good light emitting device. At the same time a nanohydroxyapatite powder of the lanthanum doped terbium has good antibacterial property, can be used as antibacterial materials.

Abstract: Rare earth metal complexes have special characteristics, such as extremely narrow emission bands and high internal quantum efficiencies, which are suitable to be used as the emission materials, chemistry and biological technology. Ternary nano complex of terbium gatifloxacin phenanthroline was synthesized.The composition and structure of ternary complex were characterized by element analysis, Mass Spectrometry (MS), UltraViolet Absorption Spectrometry (UV) and fluorescence spectra(FS). The influences of solubility, thermal stability and luminescent properties of complex as well as addition of phenanthroline secondary ligands on the fluorescence spectra of the ternary complexes were studied. The results of fluorescence spectra analysis showed that partial energy was transferred from Characterization to terbium ions by intramolecular energy transfer processes, meanwhile, the addition of phenanthroline can effectively increase the luminescence intensity of terbium icons. The complex possessed well luminescence and showed characteristic emission peaks of Tb³⁺ under UV light excitation and emitted strong green fluorescence. Moreover, in an ITO/PVK/Tb(GFLX)₃Phen/Al device, Tb³⁺ ion can be excited by intramolecular ligand-to-metal energy transfer process. The main peak of emission at 545 nm is attributed to ⁵D₀→⁷F₂ transition of the Tb³⁺ ion, and this process results in the enhancing green emission. Biological actrivity properties of the rare earth complex was well studied.

Abstract: A complex of Eu(Ⅲ), HTTA and TPPO was synthesized in alcohol (HTTA= 2-Thenoyltrifluoroacetone and TPPO=Triphenyl phosphine oxide )and its corresponding single crystal was obtained. The complex was characterized by IR,UV, X-ray single crystal diffraction.The photoluminescent and electroluminescent properties of the complex were studied. The results showed that the spectra structure characterization is consistent with that of single-crystal diffraction. The complex exhibited ligand-sensitized red emission, and it has higher sensitized luminescent efficiency and good thermal stability.In device ITO/PVK/ Eu(TTA)3(TPPO)2/Al, Eu3+ may be excited by intramolecular energy transfer from ligand as observed by electroluminescence. The main emitting peak at 614 nm can be attributed to the europium of ⁵D₀→⁷F₂ of Eu ³⁺ ion and this process results in the enhancement of red emission from electroluminescence device. The present study may be important and helpful for the development of red color rare earth display applications.