Fluorescent Polyimide Films Produced with Diatomite and Mesoporous Silica as Promising High-Tech Material

Khalid, Mohamed Ali; Zhao, Yue; Yang, Yuxiang; Liu, Xiangnong; Garrone, E.; Akase, Dai; Diao, Guangxiang; Carlini, Riccardo

doi:10.1007/s10904-021-01943-0

Cited by 1 publication

(2 citation statements)

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“…The CNDs show homogeneous size distributions (approximately 3.0 nm), and the clear lattice spacing indicates the good crystallinity of the CNDs, as shown in Figure a and b. Pure PVA and g-films with different CND concentrations were characterized by SEM, as shown in Figure c to f. Compared with pure PVA, particles with a size of about 800 nm can be observed in g-films (0.5 and 1 mg/mL), due to the self-assembly in the phosphorescence films forming process . The self-assembly CNDs within the film are isolated by PVA at low concentration, while the self-assembly CNDs were further aggregated when the concentration increased to 3 mg/mL.…”

Section: Results and Discussionmentioning

confidence: 94%

“…Pure PVA and g-films with different CND concentrations were characterized by SEM, as shown in Figure 3c to f. Compared with pure PVA, particles with a size of about 800 nm can be observed in g-films (0.5 and 1 mg/mL), due to the self-assembly in the phosphorescence films forming process. 52 The self-assembly CNDs within the film are isolated by PVA at low concentration, while the self-assembly CNDs were further aggregated when the concentration increased to 3 mg/mL. The phosphorescence performance of the film with a high concentration degraded to some extent, due to possible electron/energy transfer between adjacent CNDs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Brighten Triplet Excitons of Carbon Nanodots for Multicolor Phosphorescence Films

et al. 2022

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Triplet excitons usually do not emit light under ambient conditions due to the spin-forbidden transition rule, thus they are called dark excitons. Herein, triplet excitons in carbon nanodots (CNDs) are brightened by embedding the CNDs into poly(vinyl alcohol) (PVA) films; flexible multicolor phosphorescence films are thus demonstrated. PVA chains can isolate the CNDs, and excited state electron or energy transfer induced triplet exciton quenching is thus reduced; while the formed hydrogen bonds between the CNDs and PVA can restrict vibration/rotation of the CNDs, thus further protecting the triplet excitons from nonradiative recombination. The lifetimes of the flexible multicolor phosphorescence films can reach 567, 1387, 726, and 311 ms, and the longest-lasting phosphorescence film can be observed by naked eyes for nearly 15 s even after bending 5000 times. The phosphorescence films can be processed into various patterns, and a dynamic optical signature concept has been proposed and demonstrated based on the phosphorescence films.

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Section: Results and Discussionmentioning

confidence: 94%

Section: ■ Results and Discussionmentioning

confidence: 99%