Effect of photo-oxidation on the emissive properties of truxene

Huang, Jiang; Lai, Ningshan; Tang, Jing; Tian, Xiaobo; Wei, Fangfang; Bai, Weibin; Xu, Yanlian

doi:10.1016/j.jphotochem.2018.09.028

Cited by 6 publications

(10 citation statements)

References 12 publications

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“…These graphs show that the peak emission wavelength lengthens when exposed to UV-C irradiation. Photo-oxidation causes the red-shifted maximum excitation wavelength from 410 to 455 nm [33]. However, the 3D fluorescence image of the PA6/CF Fig.…”

Section: Resultsmentioning

confidence: 97%

The effect of UV irradiation on polyamide 6/carbon-fiber composites based on three-dimensional printing

2020

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In this research, we demonstrate the effect of ultraviolet-C (UV-C) irradiation of Polyamide 6/carbon-fiber (PA6/CF) composites. The PA6 and PA6/CF composites were fabricated using a fused deposition modeling type 3D printer with a single spool. These specimens were exposed for 0, 1, 3, 5, and 7 days under UV-C light irradiation. After exposure, the specimens were observed and characterized with contact angle measurements, Fourier transform infrared analysis, 3D fluorescence spectroscopy analysis, tensile tests, and scanning electron microscopy. As a result, PA6 was found to be more photo-oxidative degraded than PA6/CF. Furthermore, the 3D fluorescence images and emission spectra were shown to successfully coincide with the results of the photo-oxidative degradation reactions of PA6 and PA6/CF. In addition, the tensile test results showed a dramatic decrease in PA6 while PA6/CF did not decrease much, indicating that CF is useful not only as a reinforcement of the composite but also for UV protection.

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Section: Resultsmentioning

confidence: 97%

The effect of UV irradiation on polyamide 6/carbon-fiber composites based on three-dimensional printing

2020

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“…48 Recent studies indicate that in the presence of light and O 2 , 4 can be oxidized to a monocarbonyl derivative, namely truxene-5-on. 49 Unsubstituted truxenes display low solubility, which is a direct consequence of their strong p-stacking interactions. Thus, to reduce this intermolecular effect, alkyl substituents are introduced in the 5, 10, and 15 positions.…”

Section: Justyna Mech-piskorzmentioning

confidence: 99%

“…48 Recent studies indicate that in the presence of light and O 2 , 4 can be oxidized to a monocarbonyl derivative, namely truxene-5-on. 49…”

Section: H-symmetric Truxenesmentioning

confidence: 99%

From truxenes to heterotruxenes: playing with heteroatoms and the symmetry of molecules

2022

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“…As a result of the proximity between two molecules of the truxene dimer (2.44 Å), they are strongly coupled and interacted with each other, giving rise to an energy gap that is smaller than that of the monomer. Therefore, a broad emission at the long wavelength (520 nm) is observed to be irradiated by a 355 nm laser, in addition to the almost negligible emission of the monomer at ∼370 nm (Figure b) . The ultraviolet–visible (UV–vis) absorption edge is at ∼337 nm.…”

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confidence: 97%

“…Therefore, a broad emission at the long wavelength (520 nm) is observed to be irradiated by a 355 nm laser, in addition to the almost negligible emission of the monomer at ∼370 nm (Figure 1b). 33 The ultraviolet−visible (UV−vis) absorption edge is at ∼337 nm. The weak green emission has a photoluminescence quantum yield (PLQY) of 1.78% (Figure 1c and Figure S2).…”

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confidence: 99%

Pressure-Induced Restricting Intermolecular Vibration of a Herringbone Dimer for Significantly Enhanced Multicolor Emission in Rotor-Free Truxene Crystals

Liu

et al. 2022

J. Phys. Chem. Lett.

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Organic solid-state luminescent materials exhibit numerous exciting photoelectric properties that are central to emergent organic light-emitting diodes, smart sensors, and data encryption. However, the luminescence of pure organic rotor-free materials has been afflicted with strong intermolecular π−π stacking interactions. Herein, an unprecedented pressureinduced emission enhancement (PIEE) is realized in a system of rigid planar pure polycyclic aromatics, i.e., truxene crystals. The emission intensity is enhanced 7-fold below 3.0 GPa with a photoluminescence quantum yield increased to 10.17% compared with the initial value of 1.78%, and the emission colors change from green (520 nm) to red (640 nm) within 11.8 GPa. Spectral characterizations and first-principles calculations reveal that the PIEE and piezochromism can mainly be attributed to the restricted intermolecular vibration and the decreased energy gap. Our findings enrich the PIEE mechanism and provide a new guideline for designing pressureresponsive luminescent materials in advancing their photoelectric applications.

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Effect of photo-oxidation on the emissive properties of truxene

Cited by 6 publications

References 12 publications

The effect of UV irradiation on polyamide 6/carbon-fiber composites based on three-dimensional printing

The effect of UV irradiation on polyamide 6/carbon-fiber composites based on three-dimensional printing

From truxenes to heterotruxenes: playing with heteroatoms and the symmetry of molecules

Pressure-Induced Restricting Intermolecular Vibration of a Herringbone Dimer for Significantly Enhanced Multicolor Emission in Rotor-Free Truxene Crystals

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