Polymer-Stretching-Regulated Microscopic Photoluminescence of Vibration-Induced Emission (VIE) Molecules
2021
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 doped
9,14-diphenyl-9,14-dihydrodibenzo[a,c]-phenazine (DPAC) and its derivative
DPAC-CN in two stretchable polymers, poly(e-caprolactone) and ethylene
vinyl acetate (EVA) copolymer, to explore the important relationship between luminophores and polymer systems. This
research focused on the multicolor photoluminescence of the obtained blend
films that resulted from stretching exertions and temperature responses.
The successive conformational alterations of VIE molecules endowed
continuous photoluminescent changes. Meanwhile, the multicolor variations also provided
specific visual evidence regarding the amplified tensile stresses and
microstructural changes in the
polymer. This demonstration
will therefore provide advantageous insights into the development of
functional optical materials.
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