# Stimuli‐Responsive Electrospun Fluorescent Fibers Augmented with Aggregation‐Induced Emission (AIE) for Smart Applications

## TL;DR

This review explores how fluorescent fibers made with AIE materials can be used in smart devices like sensors and drug delivery systems.

## Contribution

The paper introduces how AIE materials in electrospun fibers overcome aggregation-caused quenching and enable smart applications.

## Key findings

- AIEgens in electrospun fibers improve photostability and photothermal properties.
- Modified AIEgens like tetraphenylethylene and triphenylamine derivatives enhance device sensitivity.
- Applications span optoelectronics, drug delivery, and chemosensors.

## Abstract

This review addresses the latest advancements in the integration of aggregation‐induced emission (AIE) materials with polymer electrospinning, to accomplish fine‐scale electrospun fibers with tunable photophysical and photochemical properties. Micro‐ and nanoscale fibers augmented with AIE dyes (termed AIEgens) are bespoke composite systems that can overcome the limitation posed by aggregation‐caused quenching, a critical deficiency of conventional luminescent materials. This review comprises three parts. First, the reader is exposed to the basic concepts of AIE and the fundamental mechanisms underpinning the restriction of intermolecular motions. This is followed by an introduction to electrospinning techniques pertinent to AIE‐based fibers, and the core parameters for controlling fiber architecture and resultant properties. Second, exemplars are drawn from latest research to demonstrate how electrospun nanofibers and porous films incorporating modified AIEgens (especially tetraphenylethylene and triphenylamine derivatives) can yield enhanced photostability, photothermal properties, photoefficiency (quantum yield), and improved device sensitivity. Advanced applications are drawn from several promising sectors, encompassing optoelectronics, drug delivery and biology, chemosensors and mechanochromic sensors, and innovative photothermal devices, among others. Finally, the outstanding challenges together with potential opportunities in the nascent field of electrospun AIE‐active fibers are presented, for stimulating frontier research and explorations in this exciting field.

This review gives an overview of the advanced composite fibers engineered from electrospinning of AIE‐active (aggregation‐induced emission) materials, for potential use in photodynamic and photothermal devices, optoelectronics, sensors, biology, and biomedicines. Detailed structure–property relationships are addressed in terms of AIE chemical structures, fiber morphology, and composite microstructures.