Highly transparent, writable and photoluminescent foldable polymer film: When fluorescent dyes or pigments join cellulose-based microgel

Yao, Yijun; Zhou, Dan; Shen, Yanqin; Wu, Hailiang; Wang, Hongru

doi:10.1016/j.carbpol.2021.117977

Cited by 19 publications

(7 citation statements)

References 46 publications

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“…Interestingly, HPMC-FITC@NH 2 -CAO fluorescent films still emitted cyan long afterglow in the dark environment after being irradiated by 365 nm UV light for 10 min and then removing the light source, and the brightness of the long afterglow gradually increased with the NH 2 -CAO content (Figure e). The long afterglow mechanism of the fluorescent film is that the dopant Eu 2+ acts as a trap to generate ions, which can greatly prolong the photon depletion process Figure f shows the emission spectra of HPMC-FITC@NH 2 -CAO fluorescent films with different NH 2 -CAO contents (irradiated at 359 nm).…”

Section: Resultsmentioning

confidence: 99%

“…The long afterglow mechanism of the fluorescent film is that the dopant Eu 2+ acts as a trap to generate ions, which can greatly prolong the photon depletion process. 47 Figure 3f shows the emission spectra of HPMC-FITC@NH 2 -CAO fluorescent films with different NH 2 -CAO contents (irradiated at 359 nm). As can be seen from the local enlarged drawing, the HPMC-FITC@NH 2 -CAO fluorescent films exhibited integrated spectra including the two species of FITC and NH 2 -CAO, and the two emission peaks at Em = 480 and 535 nm enhanced with the increase of NH 2 -CAO content.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Alkaline earth calcium aluminate doped with rare-earth elements europium and dysprosium (CaAl 2 O 4 :Eu 2+ ,Dy 3+ ), with the maximum excitation and emission wavelengths of 359 and 480 nm, respectively, is a kind of long-afterglow inorganic luminescent material . In our previous work, CaAl 2 O 4 :Eu 2+ ,Dy 3+ was loaded onto the cellulose-based microgel matrix to obtain a highly transparent, foldable, and long-afterglow cellulose film . Previous studies found that the emission wavelength of CaAl 2 O 4 :Eu 2+ ,Dy 3+ and the excitation wavelength of FITC have a partial overlap region, so it can be considered to introduce these two particles onto the cellulose skeleton simultaneously to construct a pH-responsive dual-emitting fluorescent film.…”

Section: Introductionmentioning

confidence: 99%

“…46 In our previous work, CaAl 2 O 4 :Eu 2+ ,Dy 3+ was loaded onto the cellulose-based microgel matrix to obtain a highly transparent, foldable, and long-afterglow cellulose film. 47 Previous studies found that the emission wavelength of CaAl 2 O 4 :Eu 2+ ,Dy 3+ and the excitation wavelength of FITC have a partial overlap region, so it can be considered to introduce these two particles onto the cellulose skeleton simultaneously to construct a pH-responsive dualemitting fluorescent film.…”

Section: ■ Introductionmentioning

confidence: 99%

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pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl₂O₄:Eu²⁺,Dy³⁺ Phosphors

Yao

Zhu

Shen

et al. 2021

ACS Appl. Mater. Interfaces

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Herein, we prepared a dual-emitting cellulose film with pH response, which offers high transparency, good flexibility, and intense thermal stability. The color of the fluorescent film that changes from green to blue-green to cyan was achieved by covalently attaching organic dye fluorescein isothiocyanate (FITC), inorganic pigment NH2-CaAl2O4:Eu2+,Dy3+ (NH2-CAO), and organic–inorganic fluorescence species onto hydroxypropyl methylcellulose (HMPC) chains, respectively. Benefiting from the “anchoring” and “dilution” effects of the HMPC skeleton, HPMC-FITC and HPMC@NH2-CAO fluorescent solutions and solid-state films emit green and blue-green fluorescence at 535 and 480 nm, respectively. The obtained pH-responsive cellulose-based dual-emitting film can continuously emit cyan light at the two emission peaks of 480 and 535 nm for a long time and exhibits strong fluorescence intensity under exceedingly alkaline conditions. Moreover, the HPMC-based fluorescent solution coated on glass and fabric substrate shows strong fluorescence under 365 nm UV light stimulation. Compared with the existing cellulose-based fluorescent films, this work expands the emission wavelength range of cellulose-based fluorescent films and prolongs the luminescent time of environment-responsive fluorescent films. This provides a new way to prepare intelligent color-changing fabric-coating materials and sensitive pH sensors based on biomass.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl₂O₄:Eu²⁺,Dy³⁺ Phosphors

Yao

Zhu

Shen

et al. 2021

ACS Appl. Mater. Interfaces

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“…Adding absorbers can improve the difficulty of forming precise cavities with light-transmitting materials, because the latter layer of light easily irradiates the previous layer, and each layer can easily solidify the extra area of the edge. [54][55][56][57][58] However, absorbers cause uneven formation along the z-axis. 29,55 The light-receiving surface of the slice will receive strong light, and the backlit surface will be weakened, resulting in an uneven slice formation.…”

Section: Evaluation Of Z-axis Printing Accuracymentioning

confidence: 99%

Adjusting the accuracy of PEGDA-GelMA vascular network by dark pigments via digital light processing printing

Sheng

Zheng

et al. 2021

J Biomater Appl

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Vascularization is one of the most important factors greatly influencing scaffold regeneration. In this study, a precise network of hollow vessels was printed by digital light processing (DLP) with poly(ethylene glycol) diacrylate (PEGDA)/gelatin-methacryloyl (GelMA), and dark pigmentation absorbers were added to ensure printing accuracy. First, the compound bio-inks of the PEGDA-GelMA hydrogel were prepared for direct vascular printing, and a high-precision DLP system was established. Second, the printing effects of three dark absorbers, namely, nigrosin, brilliant black, and brilliant blue, on the x-, y-, and z-axes were studied. By printing models with different densities, it was determined that 0.2% nigrosin, 0.1% brilliant black, and 0.3% brilliant blue had better effects on the x- and y-axes accuracy, and the absorbance of the absorbers played a decisive role in adjusting the accuracy. Additionally, to solve the problem of uneven curing on the upper and lower surfaces caused by the addition of an absorber with high absorbance, a model of the difference in curing width between the upper and lower surfaces of a unit-layer slice based on high-absorbance absorbers was established, and the reference value for the slice thickness was calculated. Third, the biological and mechanical properties of the bio-inks were verified with scanning electron microscopy and Fourier transform infrared, and by tensile, swelling, degradation, and cytotoxicity tests on different concentrations of PEGDA-GelMA hydrogel and absorbers. The results showed that 30% PEGDA-7% GelMA/0.1% brilliant black was the optimal preparation to print a hollow vascular network. The error of the printing tube wall and cavity was between 1% and 3%, which demonstrates the high precision of the method. Human umbilical vein endothelial cells were planted in the lumen, and the survival rate achieved 107% on the seventh day, demonstrating the good biocompatibility of the composite hydrogel.

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Double‐Key Optical Information Encryption Enabled by Multi‐State Excitation–Emission of Mn‐Doped Metal Chlorides

Zhao,

et al. 2023

Advanced Optical Materials

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Given the paramount importance of information security and confidentiality, various optical information encryption (OIE) strategies are developed based on luminescence. However, the protected information usually can be decrypted, and there is a lack of high‐level security because only one protection key can be applied. Herein, a double‐key OIE strategy is developed based on multi‐state excitation–emission of Mn‐doped metal chlorides (MMCs). The information delivered by different MMCs can be encrypted based on the similar orange luminescence of Mn d–d transition. The distinguishable excitation conditions, switchable luminescence, and unique afterglow in MMCs enable new encryption mechanisms with a great potential for high confidentiality multi‐key encryption. It is demonstrated that four information channels can be encrypted into a single luminescent pattern, concealing the true information by three interference messages, which greatly increases the security. As a demo, an encrypted quick response (QR) code is created, which can only be decrypted with both the “excitation wavelength key” and “capture time key.” The double‐key mechanism enhances the level of security and confidentiality without using expensive equipment or external stimuli.

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Highly transparent, writable and photoluminescent foldable polymer film: When fluorescent dyes or pigments join cellulose-based microgel

Cited by 19 publications

References 46 publications

pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl₂O₄:Eu²⁺,Dy³⁺ Phosphors

pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl₂O₄:Eu²⁺,Dy³⁺ Phosphors

Adjusting the accuracy of PEGDA-GelMA vascular network by dark pigments via digital light processing printing

Double‐Key Optical Information Encryption Enabled by Multi‐State Excitation–Emission of Mn‐Doped Metal Chlorides

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Highly transparent, writable and photoluminescent foldable polymer film: When fluorescent dyes or pigments join cellulose-based microgel

Cited by 19 publications

References 46 publications

pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl2O4:Eu2+,Dy3+ Phosphors

pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl2O4:Eu2+,Dy3+ Phosphors

Adjusting the accuracy of PEGDA-GelMA vascular network by dark pigments via digital light processing printing

Double‐Key Optical Information Encryption Enabled by Multi‐State Excitation–Emission of Mn‐Doped Metal Chlorides

Contact Info

Product

Resources

About

pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl₂O₄:Eu²⁺,Dy³⁺ Phosphors

pH-Responsive Dual-Emitting Hydroxypropyl Methylcellulose-Based Material Containing Fluorescein Isothiocyanate and CaAl₂O₄:Eu²⁺,Dy³⁺ Phosphors