What is the principle of Aggregation Induced Luminescence (AIE)?

In a dilute solution, there are active vibrations and rotations within the AIE molecules, and when these molecules absorb energy, the various vibrations and rotations of the energy "sit on the ground and share the spoils", so the luminescence is less.

When these molecules are gathered together, the mutual restraints limit the internal movement of the molecules, and the various vibrations and rotations of the energy are "unevenly distributed" so that none of them get the benefit of the doubt. The phenomenon of enhanced luminescence.

Since the discovery of the aggregation-induced luminescence (AIE) phenomenon, Academician Tang Benzhong's team has started to look for AIE materials that are diametrically opposed to luminescence bursts, and has developed numerous AIE systems, realizing the application of AIE materials in the fields of optoelectronic devices, smart materials, chemical sensing, biosensing and imaging.

Concluding Abstract

Aggregation-induced luminescence (AIE) materials have the advantages of durability, strong resistance to photobleaching, and resistance to elution, which have been widely used in cellular and tissue imaging. Bio-imaging requires that the light is less damaging to the living organisms and has a strong penetrating power, so the AIE materials with red/near-infrared light have become the preferred choice. On the basis of insisting on the development of a new system of AIE materials, this project takes the above real needs as the core content and achieves a series of results after four years of research.

Taking tetraphenylethylene (TPE) as the AIE chromophore, the orange-red light AIE molecule TPE-IND conjugated with TPE*** and the red light AIE material TPE-TCF conjugated with TPE*** by indole dione and TPE*** through the design of D-A structure; among them, TPE-TCF solid Luminescence peak position at 660 nm, efficiency 24. 8%.

Reference: Baidu Encyclopedia-AIE-type red light nanomaterials for bio-detection and imaging