1. Highly Stable Anodic Electrochromic Aromatic Materials Containing Triarylamine

The introduction of triphenylamine groups exhibits excellent hole-transporting properties due to the lower oxidation potential of the electroactive nitrogen center. Furthermore, as triarylamine derivatives transition from neutral to radical cation, the molecule has a structural planarization change. Consequently, their conjugated structure undergoes a redshift and significant variations in the UV-Vis absorption spectra. Additionally, the active sites within the triarylamine structures protected with methoxy groups exhibit a reduction in the oxidation potential and energy-saving effects in the context of anodic electrochromism (EC). Moreover, synthesizing multi-triphenylamine groups with electroactive properties results in the InterValence Charge Transfer (IVCT) phenomenon in the first oxidation state, enabling this polymer material to exhibit high absorption in the near-infrared region. Thus, these materials can be employed in electrochromic materials for both visible and near-infrared light, with the expectation of multiple oxidation states and multi-stage electrochromic characteristics. In recent years, we have been dedicated to enhancing the properties of electrochromic materials. By utilizing triphenylamine small molecules with multiple oxidation centers, we have prepared electrochromic device with low oxidation potential and high stability. We have also improved the porous nature of polymer thin films incorporating inorganic metal oxides through sol-gel reactions to reduce the electrochromic response time. Moreover, we have applied triphenylamine-containing polymer films as supercapacitors and the passivation layer of silver nanowires, excellent results were also obtained.

2. Highly Efficient Photoluminescent Aromatic Materials Containing Triarylamine

Incorporating triarylamine groups as the core in polymer luminescent materials demonstrates a high quantum yield. Their excellent charge transport characteristics, film-forming ability, and thin-film morphology stability give them potential applications in organic light-emitting devices. With a focus on the material's properties and judicious chemical structure design, we have successfully synthesized many high-performance luminescent small molecules and polymers containing AIE (Aggregation-Induced Emission) active groups with high quantum efficiency. By employing various polymer synthesis approaches, we can design the introduction of nitrile-functionalized or tetraphenylethene (TPE) containing triarylamine structures, imparting excellent photoluminescent properties to both the derivatives and subsequent polymers. To date, the photoluminescence quantum yield achieved in the wholly aromatic high-performance polyimide films remains the highest on record. Combining the first electrochromic and the second high-quantum efficiency triarylamine-based polymers, we have successfully fabricated electrofluorochromic (EFC) devices that emit fluorescence in their neutral state and remain non-emissive in their oxidized state, demonstrating high-contrast switching capabilities.

3. Application of Triarylamine Containing Polymer on Polymeric Memories

By introducing triarylamine moieties as electron donors in resistive polymer memory devices (ITO/polymer/metal), their memory properties can be investigated under positive and negative electric fields. When a sufficiently high voltage is applied, these devices transition from a low-conductivity state (OFF) to a stable, highly conductive state (ON). After charge transfer, the current ratio between the high-conductivity state and the low-conductivity state exceeds several tens of thousands, and the ON state can be maintained for continuous data reading over several hours, ensuring data reliability and stability. When such polymers are applied to transistor-type memory devices, they not only exhibit electrical writing and erasing behaviors but also possess photo-writing and photo-erasing characteristics. This feature highlights the significant potential of triarylamine-based polymer materials for all-photo-driven organic field-effect transistor memory applications.