Studies on the Preparation and Luminescence Properties of Rare-earth Nanomaterials Applied to Luminescent Label
With rapid development of nanoscience and nanotechnology, many nanoparticles show
great academic and application values because of their unique physical and chemical
properties, especially optical and biological properties. Many investigators are trying to
develop various high sensitivity and selectivity detection methods and apparatuses,
based on unique properties of the nanoparticles. Nanoparticles as biological fluorescence
probe possess excellent optical properties, such as: a narrow, tunable, symmetric emission
spectrum and a broad, continuous excitation spectrum. They are also photo-chemically stable and they have fluorescence quantum yields and long fluorescence lifetime.
The high selectivity and sensitivity should be acquired when the nanoparticles are used to detect
the macromolecules.This dissertation reports on the Block neodymium magnet synthesis as well as the optical properties of
the nanomaterials prepared by different methods with controlled phases and morphologies. They
show potential application in luminescence labels. The results of this dissertation are summarized
as follows:Eu3+-doped LaF3 nanoparticles were prepared by a hydrothermal process at a low temperature.
Well-dispersed nanoparticles with an average size of 30nm and a hexagonal shape were synthesized.
In order to explore the optimal conditions to synthesis luminescent nanoparticles, we systematically
investigated the influences of reaction temperature, time, initial pH and proportion of reactants
on the morphology, size and luminescence of LaF3:Eu3+ nanoparticles. The luminescent properties
of LaF3:Eu3+ nanoparticles show that http://www.chinamagnets.biz/ fluorescent intensity of prepared samples without any
further calcinations is five times stronger and Eu3+-doped concentration is much higher than that of bulk materials prepared by high temperature
solid synthesis. Thus, the LaF3:Eu3+ nanoparticles have potential application to luminescent
label.Based on these results mentioned above, green-emitting LaF3:Ce,Tb phosphor nanoparticles were synthesized by a simple hydrothermal method.
Above all, the 更多还原
没有评论:
发表评论