VO43-在R2V2O7:Eu3+（R=Sr,Ca,Ba）的宽带发射（英文）

R2V2O7:Eu3+(R=Ca,Sr,Ba)样品由溶胶凝胶法制备。研究了样品的发光性能。随着R离子半径的增加,样品的发射光谱出现了一个450～750nm宽的发射宽带。发射谱在617nm的发射峰来自于Eu3+的5D0-7Fj的跃迁,除此之外,在510nm出现了另一最强发射峰,归因于VO43-离子团的本质的发射。另外,可以改变R离子半径来控制蓝绿光和红光强度的比例,这可能是一个很好的应用。     

Photoluminescence properties and effect of Bi~（3＋） dopant of Eu~（3＋） and Dy~（3＋） co-doped Sr_3V_2O_8

Photoluminescence properties of Sr 2.5 Dy 1/3-x Eu x V 2 O 8(x=0,0.06,0.12,0.18,0.24,0.33) were investigated.The excitation spectra included a broad band in the short wavelength region and several sharp lines in the longer wavelength region,and the spectral origin were discussed.The emission spectra were measured in two different exciting ways,i.e.,exciting the VO 4 group at 270 nm and the Eu 3+ ion at 398 nm,respectively,and the energy transferring process was reasonably suggested.Furthermore,multi-color emission could be achieved in Sr 2.5 Dy 1/3-x Eu x V 2 O 8,indicating that the studied samples had potential applications in the white light emitting diodes.Further investigation showed that reducing the concentration of Eu 3+ and Dy 3+ and introducing Bi 3+ as a sensitizer ion greatly enhanced the emission intensity.     

溶胶-凝胶自燃烧合成法制备SrFe12O19及其磁性能研究

本文采用溶胶-凝胶自燃烧合成法制备了SrFe12 O19.研究了柠檬酸配比对SrFe12O19的物相组成、形貌及磁性能的影响.当柠檬酸与金属离子摩尔比为3:1时,矫顽力为6518 Oe (518.83kA/m),比饱和磁化强度σs为84.45 A·m2/kg.通过对经过预烧和不经过预烧所制备出的两种样品的研究,发现不经...     

Dy3+ activated LaVO4 films synthesized by precursors with different solution concentrations

Using different-solution-concentration precursors with citric acid as chelating agent and polyvinyl alcohol as dispersing media, Dy3+ activated LaVO4 films were deposited on indium tin oxide (ITO) substrates. The scanning electronic microscope (SEM) showed that the compact and crack-free LaVO4:Dy3+ film could be obtained at a suitable solution concentration. The deposited films could absorb the ultra-violet light below 400 nm and were transparent in the visible and infrared region as evidenced by the transmission spectra, and the photolumines-cence spectra exhibited the characteristic emissions of Dy3+ peaking at 484 (blue) and 576 (yellow) nm due to the transitions of 4F9/2→6H15/2 and 4F9/2→6H13/2, respectively. The potential application of LaVO4:Dy3+ film in the dye-sensitized solar cell (DSSC) was also discussed.