Preparation method of fluorescent hybrid nanoparticles

Abstract

The invention discloses a preparation method of fluorescent hybrid nanoparticles. The preparation method includes: preparing ternary complexes of rare-earth europium under the alkaline condition (adjustment with a water solution of sodium hydroxide) prior to dispersing via an alkaline solution (adjustment with ammonium hydroxide); subjecting the alkaline solution to further hybrid reaction with silica gel; on the premises of reducing particle size of silicon dioxide, enabling dispersibility of the ternary complexes of the rare-earth europium in silicon dioxide nanoparticles to be improved. The obtained fluorescent hybrid nanoparticles are obviously improved in fluorescence property, fluorescence strength is doubled that of a pure complex, fluorescence decay trend is alleviated, fluorescence life is prolonged, and raw materials good in fluorescence property are provided for photoluminescence materials.

Description

technical field [0001] The invention relates to the technical field of fluorescent materials, in particular to a method for preparing fluorescent nano-hybrid particles. Background technique [0002] The reason why rare earths have excellent luminescent properties is that they have a special energy conversion function (that is, the transition of electrons between different energy levels to generate energy) and a special 4f electron layer structure. However, the light absorption coefficient ε of rare earth ions in the near ultraviolet region is very small, so the luminous efficiency is low. In the 1960s, Weissman discovered the "Antenna Effect", a theory that improves the luminous efficiency of rare earth ions. However, after further research, it was found that the organic complexes of rare earth ions have poor thermal stability, concentration self-quenching phenomenon is prone to occur at high concentrations, and the compatibility mismatch between the preparation method and ...

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Problems solved by technology

In 1997, K. Machida and G. Adachi used the sol-gel method to prepare organo-rare earth complexes of europium and terbium embedded in silica, and obtained that the thermal properties and fluorescence properties of the embedding were improved. conclusion, but did not give an intuitive and effective image on the characterization of the formation of the embedding structure; in 2002, Professor M.Morita also used the sol-gel method to prepare silica-embedded organic rare earth complexes, this time they Expand the types of rare earths to four elements of cerium, samarium, europium and terbium, and mainly study the influence of temperature and annealing on the fluorescence properties of rare earth complexes

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