Fluorescent latex containing rhodamine B and preparing method thereof

Abstract

The invention discloses fluorescent latex containing rhodamine B and a preparing method thereof. The fluorescent latex is prepared from, 0.1-1wt% of rhodamine B, 5-25wt% of methyl methacrylate, 45-65wt% of styrene, 25-45wt% of butyl acrylate, cationic emulsifier and thermal initiator, the cationic emulsifier is one of cetyl trimethyl ammonium bromide, dodecyl ammonium chloride and dodecyl pyridine ammonium chloride, and the thermal initiator is azobis(2-methylpropionamidine) amidine hydrochloride or azobisisobutryamide imidazoline chloride. The relative amount of added water is controlled, and the solid content range of the prepared water-based fluorescent latex polymer is 10-40wt%. According to the prepared fluorescent latex containing rhodamine B, rhodamine B is evenly adsorbed on the surfaces of latex particles through charge attraction so as to be uniformly dispersed during solidification, and the aggregation-induced quenching effect is inhibited.

Description

technical field [0001] The invention relates to the field of fluorescent composite materials, in particular to a fluorescent latex containing rhodamine B and a preparation method thereof. Background technique [0002] Fluorescence, also known as "fluorescence", refers to a cold luminescence phenomenon of photoluminescence. When a substance at room temperature is irradiated by incident light of a certain wavelength (usually ultraviolet or X-ray), it absorbs light energy and enters an excited state, and immediately de-excites and emits outgoing light with a wavelength longer than that of the incident light (usually at a wavelength of Visible light band); and once the incident light is stopped, the luminescent phenomenon will disappear immediately. With the advancement of science and technology, the research and application of fluorescent materials are becoming more and more extensive: in addition to dyes, they are also used in organic pigments, optical brighteners, photooxida...

AI Technical Summary

Problems solved by technology

This is because traditional fluorescent molecules generally have a molecular structure with a large conjugated fair plane, and there is a strong intermolecular force between molecules, that is, π-π stacking (similar to the H-aggregation effect). The phenomenon of electronic transition dipole moment leads to the formation of excited groups between fluorescent molecules when they are in an aggregated state (solid state or dispersed in a poor solvent), which causes the excitation energy to be dissipated in a non-radiative form, and the emitted fluorescent molecules Fluorescence red shifted and decreased in intensity

In addition, devices made by general doping methods are prone to aggregation, crystallization and quenching due to the same reason, which reduces the life of light-emitting devices.

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