The invention relates to the design of organic fluorescent materials, in particular to a small molecular fluorescent compound with polymerization-induced emission characteristics, which can display emitted light in a second near-infrared window (1000-1700 nm) and can provide imaging for deep tissues at an ultrahigh signal-to-noise ratio. For example, neutrophils carrying the compounds of the invention can penetrate the brain, and inflammation located deep in brain tissue can be observed through the intact scalp and skull.
Near-infrared two-region aggregation-induced emission molecule and application thereof