【摘 要】
：
The europium-doped LaF3 nanoparticles were prepared by refluxing method in glycerol/water mixture and characterized with X-ray diffraction(XRD), field emission
【机 构】
：
Analytical and Testing Center,State
论文部分内容阅读
The europium-doped LaF3 nanoparticles were prepared by refluxing method in glycerol/water mixture and characterized with X-ray diffraction(XRD), field emission scanning electron microscopy(FE-SEM), UV-vis diffuse reflectance spectrum, and photoluminescence spectra. The results of XRD indicated that the obtained LaF3: Eu3+ nanoparticles were well crystallized with a hexagonal structure. The FE-SEM image illustrated that the LaF3: Eu3+ nanoparticles were spherical with an average size around 30 nm. Under irradiation of UV light, the emission spectrum of LaF3: Eu3+ nanoparticles exhibited the characteristic line emissions arising from the 5D0→7FJ (J=1, 2, 3, 4) transitions of the Eu3+ ions, with the dominating emission centered at 590 nm. In addition, the emissions from the 5D1 level could be clearly observed due to the low phonon energies (-350 cm-1) of LaF3 matrix. The optimum doping concentration for LaF3: Eu3+ nanoparticles was determined to be 20mol.%.
其他文献
In the present study,a semi-implicit finite difference model for non-bydrostatic,free-surface flows is analyzed and discussed.The governing equations are the th
在数控机床发展的最初阶段，其机械结构与通用机床相比没有多大的变化，只是在自动变速、刀架和工作台自动转位和手柄操作等方面作些改变。随着数控技术的发展，考虑到它的控制方式
Stability analysis plays a central role in nonlinear system theory and engineering application.Over the past few yeats,the stability analysis of fuzzy systems h
A new theoretical solution is presented here for the dynamic characteristics of a buoyant jet due to opposing small amplitude waves.The conservation equations o
Silicon carbide (SiC) is highly wear resistant with good mechanical properties, including high temperature strength, excellent chemical resistance, and high the
Sub-micron-structure machining on silicon substrate was studied by direct writing system of femtosecond laser with the central wavelength of 800 nm, pulse durat
吴江庞山湖沈氏堂门赞神歌是存在于江苏省吴江市庞山湖地区的一种民间信仰活动,其保持着吴地神歌的原生态样态,具有鲜明的地方特色。本文就多元文化语境下的沈氏堂门赞神歌保
以50 kW潮流能水平轴水轮机为例进行叶片设计,采用计算流体力学软件Fluent分别模拟全湿流模型和空化流模型的水轮机水动力学性能,数值模拟结果表明水轮机运行过程中存在空化
For the study of the non-linear response of inclined tethers subjected to parametric excitation in submerged floating tunnels,a theoretical model for coupled tu
This work aims to investigate the effects of hydrogen content (in the range of 0%-0.5%, mass fraction) and stress state (tension and compression) on the room-te