Preparation and application of aggregation-induced red-light-emitting material with dual pH response

Abstract

The invention relates to a preparation method and an application method of an aggregation-induced red-light-emitting material with dual pH response. The red-light-emitting material is prepared from 4-(diethylamino)salicylaldehyde and 4-amino-2,1,3-benzothiadiazole through a Schiff base reaction. On the basis of the synergistic effect of distorted intramolecular charge transfer, intramolecular movement limitation and excited-state intramolecular proton transfer, the red-light-emitting material has bright red fluorescence in an aggregation state and has good aggregation-induced emission performance. As two pH-responsive elements are integrated, in the gradual acidification process of the red-light-emitting material and along with the change of the fluorescence color from red to yellow green and then to fluorescence quenching, a rod-like molecular assembly is firstly converted into microspheres under the condition of high water content, and then the microspheres are damaged under the condition of high acidity. In addition, protonation of a diethylamino group also has application value in the aspects of carbon dioxide visual detection, anti-counterfeiting and information encryption. The preparation method is simple in process, preparation cost is low, and yield is high.

Description

technical field [0001] The invention relates to the technical field of organic light-emitting materials and anti-counterfeiting and encryption materials, in particular to the preparation and application of an aggregation-induced red light-emitting material with dual pH responses. Background technique [0002] Due to the characteristics of fast response, convenient detection, high contrast, and low cost, stimuli-responsive fluorescent materials have shown great potential in imaging, anti-counterfeiting, pattern making, and sensors. However, most traditional organic luminescent agents suffer from the aggregation quenching effect, that is, the fluorescence will be weakened or even extinguished in high-concentration solutions or in an aggregated state, which greatly limits their practical use because most application scenarios are in a solid-state state. The phenomenon opposite to the aggregation quenching effect is called aggregation-induced luminescence, which has almost no em...

AI Technical Summary

Problems solved by technology

However, due to the lack of specific molecular design guidelines, most of the reported pH-responsive AIE materials have only one response site or a single function, which is not conducive to the development of multifunctional AIE fluorescent materials.

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