Study On The Structure And Photoluminescent Properties Of New Rare Earth Complexes

Rare earth complexes have many advantages, such as, high quantum efficiency, sharp emission bands, low excitation energy, high absorption and adjustable molecular structure. Therefore, the rare earth complexes have very large practical value in many fields. At present, we have mastered the basic principles of rare earth complexes luminescence. The factors that affect the luminescent properties of the rare earth complexes are various, but the structure of the ligands and the second ligands are the decisive factors. In this paper takes 1-phenyl-3-methyl-pyrazolone-5(PMP) compound as matrix. Three novel pyrazolone derivatives have been synthesized. In order to ascertain the structure of the complex of the rare earth complexes, we did the H-NMR,Elemental analysis, IR spectroscopy, UV-visible spectroscopy, phosphorescence spectra and fluorescence spectra. And, the luminescent properties of the Dy3+ and Sm3+ complexes were studied. Final, the absorption spectra of the complexes were tested. The intensity parameters(?t t=2,4,6),transition probabilities(Arad),and radiative(srad)have been predicted for Dy3+?Sm3+ ions samples by using Judd-Ofelt theory. The main works were as follows:First, in the first part of the article, the optical properties of rare earth luminescent complexes are described in detail, and the basic principle of the luminescence of rare earth complexes is introduced.Second, Three novel pyrazolone derivatives have been synthesized, Their corresponding complexes with Tb3+?Dy3+?Sm3+?Yb3+?Pr3+ were prepared. The rare earth complexes were tested by FTIR,EA,TG-DTA. At the same time, the fluorescence properties of various complexes were analyzed and studied. These three ligands can transfer energy to rare earth ions, so rare earth complexes showed strong fluorescence properties. In particular, In the synthesis of several rare earth complexes, the strongest fluorescence properties of Terbium Complex. All of these complexes show good fluorescence properties, this shows that the rare earth complexes with excellent luminescent properties, is a potential luminescent material, has a very large practical valueFinally, The photo-luminescent of complexes Dy3+?Sm3+have been studied in detail. The Judd-Ofelt theory was introduced to calculate the oscillator strength parameters ?t(t=2, 4, 6) of Dy3+?Sm3+ ions in these complexes.