611 resultados para EU3
Resumo:
Eu3 + YPO4 YVO4 V5+ 0 3 ,VO4 3 - ;V5+ 0 3 ,VO4 3 -Eu3 + , 61 9nm ,Eu3 + YPO4 YVO4 ,P5+ ,Eu3 + YP0 7V0 3 O4 Eu3 + , ,
Resumo:
Ba Y2 F8 Ce3 + ,Ba Y2 F8 Eu2 + Ba Y2 F8 Ce,Eu, . Ba Y2 F8 Ce F3 Eu F3 Ce3 + Eu2 + Ce3 + Eu3 + . , Ce4 +
Resumo:
5 0 0 0 0cm- 1 ( 2 0 0nm) , 4f 4f ,4f 5d ,4f 6s ,Dorenbos :E(Ln ,A ) =493 40 -D(A) +ELn ,Ce,Sm3+ Ba3BP3O1 2 4f 5d 170nm ME0Ln :E0Ln(Lnn + Ln(n - 1 ) ) =4 2 73 M-7 776(n =3 4) , M J rgensenEct=[X-M] 3 0 0 0 0cm - 1 ,Er3+Eu3+LiYF4 ErLiYF4 Eu3+Er OEu3+ O ,LiYF4 Eu3+ Eu3+ F ,
Resumo:
, YAGYAGRE3+ (RE =Eu ,Dy) (1% , ) ,XRD ,TG DTA YAGYAGEu 80 0 90 0Eu3+ YAG , , ,90 0 10 0 0
Resumo:
(Eu3+ ,Tb3+ )Ca2 Y8(SiO4 ) 6 O2 X (XRD) , (IR) , (SEM) ,XRD 70 0 ,80 0Ca2 Y8(SiO4 ) 6 O2 ,10 0 0Ca2 Y8(SiO4 ) 6 O2 Eu3+ ,Eu3+ 5D0 -7F2 (616nm)Ca2 Y8(SiO4 ) 6 O2 Tb3+ ,5D3-7FJ,5D4 -7FJ(J =6,5 ,4,3 ) ,5D4 -7F5(5 44nm)
Resumo:
BaLaB9O1 6 RE (RE =Eu ,Tb) , 14 7nm , 15 0nm ,Eu3+ 2 5 0nm ,Tb3+ 4f 5d 15 0 2 60nm , ,
Resumo:
Y2 O3:Eu3+ , , - Y2 O3:Eu3+ / . FTIR , ; XPS ,Y3d5 / 2 , . : , .EDS
Resumo:
- ( phen) 2 Eu/MCM-4 1 , X - , . , MCM-4 1 , , , , , , Eu3+ , . , .
Resumo:
(Agkistrodon blomhoffii Ussurensis) A2(PLA2 ) . ,PLA2 , PLA2 , (Trifluoperazine) PLA2 . La3+Eu3+Dy3+Yb3+ PLA2 ,La3+ Eu3+ Dy3+ Yb3+.
Resumo:
A novel macrocyclic compound-water soluble functional calixresorcin[4]arenes-tetra para sulfo-phenylmethyl-calixresorcin[4]are was synthesized for the first time. The photophysical properties of terbium and europium ions encapsulated in the macrocyclic ligand were studied in detail. The triplet state energy of the calixresorcin[4]arene was determined to be 24400 cm(-1) by the low temperature phosphorescence spectrum and it was found that it can sensitize both terbium ion and europium ion. The possible energy transfer process between the functional calixresorcin[4]arene and the encapsulated Tb3+ and Eu3+ was discussed. The luminescence quantum efficiency of Tb3+- calixresorcin[4]arene was calculated.
Resumo:
In-situ synthesis of ternary europium complex with thenoyltrifluoacetone (TTA) and 1,10-phenanthroline (phen) in titania matrix in the presence of dimethylformamide (DMF) by a sol-gel process was described, which was confirmed by the luminescence excitation spectra and infrared spectra. The titania gel that contains europium complex exhibits Eu3+ characteristic emission bands and presents a longer fluorescence lifetime than the pure complexes dissolved in ethanol solution. The concentration effect on the luminescence intensity was also investigated.
Resumo:
The dependence of the structure of the hosts on the M ion radius in MMgAl10O17 (M = Be, Mg, Ca, Sr, Ba, Pb, Eu, Mn, Fe, Co, Ni, Zn, Cd, Sn) system was studied and the luminescence of Eu2+ the mixed phase system was discussed. When M ion radius is less than 0.10 nm, the system MMgAl10O17 constructs by the mixed phases consisting of manegtoplumbite and spinel, alpha-alumina or spinel and alpha-alumina. In the mixed phase of manegtoplumbite and spinel and alpha-alumina, Eu2+ ion preferentially occupies lattice site of the cations in manegtoplumbite well matched with the radius and charge of Eu2+. There exists only d-->f transition emission of Eu2+ and no characteristic emission of Eu3+ occurs in those hosts. In the mixed phase of spinel and alpha-alumina, Eu2+ can enter the lattice site of Mg2+ ion or Al3+ ion and the d-->f and f-->f transition of Eu2+ can been observed respectively. Meanwhile, since the radius and charge of matrix lattice ions substituted by Eu2+ do not match with those of Eu2+, the valence state of Eu2+ is unstable. Eu2+ is partly changed into Eu3+ and the emission of Eu3+ is obviously observed even under the condition of reduction atmosphere. If reaction temperature is more than 1 150 degrees C, Al2O3 forms alpha-Al2O3 structure, the f-->f transition of Eu2+ appears. If reaction temperature is less than 1 150 degrees C, a mixed phase of alpha-Al2O3 and gamma-Al2O3 is formed, the f-->f transition of Eu2+ disappears and a new band emission from d-->f transition of Eu2+ occurs.
Resumo:
Ternary europium complexes with thenoyltrifluoroacetone (TTA) and phenanthroline (phen) were incorporated into SiO2/polymer matrix by a sol-gel method. The gels exhibit the characteristic emission bands of europium ion. In addition, Eu3+ presents a longer fluorescence lifetime in gel than in the corresponding pure complex powder. Concentration effects on the luminescence intensity were investigated. The reasons that are responsible for above results are also discussed in the context.
Resumo:
Ternary europium complex with dibenzoylmethane (DBM) and 1,10-phenanthroline (phen) was in-situ synthesized in thin SiO2/polyvinyl butyral (PVB) hybrid films by a two-step sol-gel process and characterized by;means of fluorescence spectroscopy. The luminescence spectra, fluorescence lifetimes and photostability were all investigated. The results showed that the hybrid films exhibited the characteristic emission bands of the Central rare earth Eu3+. In addition, Eu3+ presented longer fluorescence lifetime than in an ethanol solution and the complex had a higher photostability in the hybrid film than in the PVB film containing the corresponding pure complex.
