【摘 要】
：
YVO4:Yb3+, Er3+ nano-sized upconversion luminescent powder was prepared by sol-gel method in the presence of citric acid. It was characterized by XRD, TEM and e
【机 构】
：
School of Material Science and Engineering
论文部分内容阅读
YVO4:Yb3+, Er3+ nano-sized upconversion luminescent powder was prepared by sol-gel method in the presence of citric acid. It was characterized by XRD, TEM and emission spectrum. The results show that the grain size of YVO4:Yb3+, Er3+ is under 100 nm, and its grain size and upconversion luminescent intensity all increase with roasting temperature raises. Under 980 nm laser diode(LD) excitation, two strong green emissions that centered around 523 and 551 nm were observed with naked eyes at room temperature, corresponding to the 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions of Er3+, respectively. According to the dependence of green upconversion emission intensity on excitation power, it can be concluded that these two kinds of green emissions all belong to two-photon process.
其他文献
The effect of Nb in (La0.5Ce0.5)64-xAl16Ni5Cu15Nbx (x=0-5, mole fraction) bulk metallic glasses was investigated by X-ray diffractometry, differential scanning
In order to evaluate the effect of stoichiometric ratio upon electrochemical properties of AB5-type hydrogen storage alloys, a series of alloys Mm0.8La0.2(Ni4.0
The deformation behavior of squeeze cast ZK60 magnesium alloy was investigated by compressive tests conducted at temperatures of 250-450 ℃ and strain rates of
The effects of reactive gas partial pressure on droplet formation,deposition rate and change of preferred orientation of CrN and Cr2O3 coatings were studied. Fo
Many factors were found to have effects on the conversion coatings for AZ31 alloy, alloy the most important one in producing high quality conversion coatings is
The 7××× aluminum alloys having a microstructure with precipitate free zones (PFZ) nearby the grain boundary, have received a great deal of attention due to
The photoconductive characteristic of the inorganic/organic hybridized polymer system is reported,in which a novel bi-functional photorefractive (PR) poly(N-vin
Intermetallic compounds(IMC) formed at Sn-Ag-Cu solder droplet/pad interface during wetting reaction were investigated.Comparative studies of the IMC evolution
Al-Zn-Mg-Cu-Zr ingots with diameter of 200 mm were made by low frequency electromagnetic casting (LFEC) and conventional direct chill (DC) casting process. The
In view of the higher temperature of large- size Ni/ MH battery in electric vehicle, the effect oftemperature on electrochemical performances of hydrogen storag