Fast photoluminescence quenching in thin films of 4,4′-bis(2,2-diphenylvinyl)-1,1′-biphenyl exposed to air

Tomović, Aleksandar Ž.; Jovanović, V. D.; Đurišić, Ivana; Cerovski, Viktor Z.; Nastasijević, Branislav; Veličković, Suzana; Radulović, K.; Žikić, Radomir

doi:10.1016/j.jlumin.2015.06.036

Cited by 5 publications

(3 citation statements)

References 44 publications

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“…27,28 Lignin is a highly conjugated aromatic component, making it an efficient UV absorbent. 29,30 UV-absorbing properties are desired in many applications, such as contact lenses 31 and in optoelectronics (e.g., solar cells 32 and organic light-emitting diodes 33 ). By introducing biobased UV absorbents to electronic devices, malfunctions caused by overexposure of UV radiation could be reduced.…”

Section: ■ Introductionmentioning

confidence: 99%

Highly Transparent Nanocomposites Based on Poly(vinyl alcohol) and Sulfated UV-Absorbing Wood Nanofibers

Sirviö

Visanko

2019

Biomacromolecules

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Unbleached lignocellulose fibers were studied for the fabrication of wood-based UV-absorbing nanofibers and were used to produce transparent nanocomposites. Groundwood pulp (GWP) and sawdust were selected as raw materials thanks to their low processing degree of fibers and abundant availability as a low-value industrial side stream. Both materials were first sulfated using a reactive deep eutectic solvent. The sulfated wood and sawdust nanofibers (SWNFs and SSDNFs, respectively) were fabricated using a mild mechanical disintegration approach. As a reference material, sulfated cellulose nanofibers (SCNFs) were obtained from bleached cellulose pulp. Our results showed that both GWP and sawdust exhibited similar reactivity compared with bleached cellulose pulp, whereas the yields of sulfated lignin-containing pulps were notably higher. The diameters of both SWNFs and SSDNFs were approximately 3 nm, which was similar to those of the SCNFs. When 10 wt % of lignin-containing nanofibers were mixed together with poly(vinyl alcohol), the fabrication of nanocomposites with only a minimal decrease in transparency in the visible light spectrum was achieved. Transmission in the UV region, on the other hand, was significantly reduced by SWNFs and SSDNFs, whereas SCNFs had only a minor UV-absorbing property. Although the reinforcing effect of lignin-containing nanofibers was lower compared with that of SCNFs, it was comparable with those of other UV-absorbing additives reported in the literature. Overall, the wood-based UV-absorbing nanofibers could have a valuable use in optical applications such as lenses and optoelectronics.

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Section: ■ Introductionmentioning

confidence: 99%

Highly Transparent Nanocomposites Based on Poly(vinyl alcohol) and Sulfated UV-Absorbing Wood Nanofibers

Sirviö

Visanko

2019

Biomacromolecules

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“…The rapid fluorescence decline indicates the generation of radical cation species in the photooxidative process, which can act as electron acceptors to quench the singlet state even at low concentrations through an effective charge transfer. [30][31][32] The color of the amorphous films after 2 h sunlight irradiation varies from white to a distinct red, and the corresponding thin-layer chromatographic (TLC) analysis confirms that SFDBAO (red dots) is already formed at that point (Figure S4a). The emission spectra of microcrystal films are almost unchanged during the 8 h irradiation by sunlight, still exhibiting an obvious blue light centered at 429 nm, as displayed in Figure 3c.…”

Section: Resultsmentioning

confidence: 79%

“Steric armor” strategy of blue fluorescent emitters to against photooxidation-induced degradation

Wang,

Zhang,

Wang

et al. 2024

Preprint

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Stability against oxygen is an important factor affecting the performance of organic semiconductor devices. Improving photooxidation stability can prolong the service life of the device and maintain the mechanical and photoelectric properties of the device. Generally, various encapsulation methods from molecular structure to macroscopic device level are used to improve photooxidation stability. Here, we adopted a crystallization strategy to allow 14H-spiro[dibenzo[c,h]a-cridine-7,9′-uorene] (SFDBA) to pack tightly to resist fluo-rescence decay caused by oxidation. In this case, the inert group of SFDBA acts as a “steric armor”, protecting the photosensitive group from being attacked by oxygen. Therefore, compared with the fluorescence quenching of SFDBA powder under two hours of sunlight, SFDBA crystal can maintain its fluorescence emission for more than eight hours under the same conditions. Furthermore, the photolu-minescence quantum yields (PLQYs) of the crystalline film is 327.37 % higher than that of the amorphous film. It shows that the crystal-lization strategy is an effective method to resist oxidation.

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“…The rapid fluorescence decline indicates the generation of radical cation species in the photooxidative process, which can act as electron acceptors to quench the singlet state even at low concentrations through an effective charge transfer. [ 34‐36 ] The color of the amorphous films after 2 h sunlight irradiation varies from white to a distinct red, and the corresponding thin‐layer chromatographic (TLC) analysis confirms that the oxidation products are mixtures of SFDBAO (red dots) and SFDBA (blue dots), as shown in Figure S4, and some possible intermediates may also exist. The emission spectra of microcrystal films are almost unchanged during the 8 h irradiation by sunlight, still exhibiting an obvious blue light centered at 429 nm, as displayed in Figure 3c.…”

Section: Resultsmentioning

confidence: 83%

“Steric Armor” Strategy of Blue Fluorescent Emitters against Photooxidation‐Induced Degradation

Wang,

Zhang,

Wang

et al. 2024

Chin. J. Chem.

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Comprehensive SummaryStability against oxygen is an important factor affecting the performance of organic semiconductor devices. Improving photooxidation stability can prolong the service life of the device and maintain the mechanical and photoelectric properties of the device. Generally, various encapsulation methods from molecular structure to macroscopic device level are used to improve photooxidation stability. Here, we adopted a crystallization strategy to allow 14H‐spiro[dibenzo[c,h]acridine‐7,9′‐uorene] (SFDBA) to pack tightly to resist fluorescence decay caused by oxidation. In this case, the inert group of SFDBA acts as a “steric armor”, protecting the photosensitive group from being attacked by oxygen. Therefore, compared with the fluorescence quenching of SFDBA powder under 2 h of sunlight, SFDBA crystal can maintain its fluorescence emission for more than 8 h under the same conditions. Furthermore, the photoluminescence quantum yields (PLQYs) of the crystalline film is 327% higher than that of the amorphous film. It shows that the crystallization strategy is an effective method to resist oxidation.

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Fast photoluminescence quenching in thin films of 4,4′-bis(2,2-diphenylvinyl)-1,1′-biphenyl exposed to air

Cited by 5 publications

References 44 publications

Highly Transparent Nanocomposites Based on Poly(vinyl alcohol) and Sulfated UV-Absorbing Wood Nanofibers

Highly Transparent Nanocomposites Based on Poly(vinyl alcohol) and Sulfated UV-Absorbing Wood Nanofibers

“Steric armor” strategy of blue fluorescent emitters to against photooxidation-induced degradation

“Steric Armor” Strategy of Blue Fluorescent Emitters against Photooxidation‐Induced Degradation

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