Polymer-Stretching Photoluminescent Regulation by Doping a Single Fluorescent Molecule

Abstract

Photoluminescence materials play an inseparable role in the application of polymer systems. However, intrinsic polymer systems have rarely been intuitively interpreted based on photoluminescence regulation. A novel photoluminescence mechanism called vibration-induced emission (VIE) has recently drawn great attention due to its multicolor fluorescence from a single molecular entity. Based on the unique fluorescent properties of VIE molecules, we have doped 9,14-diphenyl-9,14-dihydrodibenzo[a,c]-phenazine (DPAC) and its derivative DPAC-CN in two stretchable polymers, poly(ε-caprolactone) and ethylene vinyl acetate (EVA) copolymer, to explore the important relationship between luminophores and polymer systems. This research focuses on the multicolor photoluminescence of the obtained blend films that resulted from stretching exertions and temperature responses. The successive conformational alterations of VIE molecules endow continuous photoluminescent changes. Meanwhile, the multicolor variations also provide specific visual evidence regarding the amplified tensile stresses and microstructural changes in the polymer. This demonstration therefore provides advantageous insights into the development of functional optical materials.

Aggregation‐Induced Emission Boosting the Study of Polymer Science

“…Conformation‐responsive multicolor solid emitters based on 9,14‐diphenyl‐9,14‐dihydrodibenzo[a,c]‐phenazine (DPAC) were blended with PCL and ethylene vinyl acetate polymer (EVA) for indicating the microsmos of these polymers under tensile stress. [ 129 ] The polymer blends exhibited different fluorescence colors at different stretching ratios. High stretching degree would induce bluer fluorescence owing to more serious conformation twisting.…”

C3-Symmetric Propeller-like Phenanthridine Derivative with Multiple Write-In Modes for Programmable Anti-Counterfeiting

“…have drawn tremendous attention in materials science and chemistry. SRCMs have shown huge potentials in display, sensors, , bioimaging, , rewritable paper, , data encryption, , and anti-counterfeiting. ,,, However, the existing SRMCs systems suffer from the following drawbacks. First, a lot of SRCMs generally only respond to one stimulus, leading to monotonic outputs and limited applications.…”

“…Inspired by this, stimuli-responsive chromic materials (SRCMs) presenting variable appearances or emission colors in response to various external stimuli ( e.g. , light, − heat, − electricity, pH, − humidity, , mechanical force, , environmental polarity and rigidity, , etc. ) have drawn tremendous attention in materials science and chemistry.…”

“…have drawn tremendous attention in materials science and chemistry. SRCMs have shown huge potentials in display, 10 sensors, 17,18 bioimaging, 20,21 rewritable paper, 14,15 data encryption, 8,19 and anticounterfeiting. 5,9,22,23 However, the existing SRMCs systems suffer from the following drawbacks.…”

“…1−3 These visual signals triggered by the stimulus can be directly discerned with naked eyes, offering a simple and straightforward approach for information collection. Inspired by this, stimuli-responsive chromic materials (SRCMs) presenting variable appearances or emission colors in response to various external stimuli (e.g., light, 4−6 heat, 7−9 electricity, 10 pH, 11−13 humidity, 14,15 mechanical force, 16,17 environmental polarity and rigidity, 18,19 etc.) have drawn tremendous attention in materials science and chemistry.…”