Photo-writing self-erasable phosphorescent images using poly(<i>N</i>-vinyl-2-pyrrolidone) as a photochemically deoxygenating matrix

Lin, Jinxiong; Wan, Shigang; Liu, Wenfeng; Lu, Wei

doi:10.1039/c9cc01388a

Cited by 17 publications

(15 citation statements)

References 38 publications

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“…3d, evident NIR emission was detected from the CDs solution under 400 nm irradiation. The emission intensity, however, dramatically decreased in the presence of PVP, indicating the consumption of the generated singlet oxygen by the PVP macromolecules 13 .…”

Section: Veri Cation Of the Oxygen-mediated Mechanismmentioning

confidence: 97%

“…Importantly, as a bio-compatible hydrophilic polymer, PVP features excellent oxygen permeability 45 , which fundamentally enables the PIOM design. Furthermore, PVP is reductive and capable of scavenging the generated singlet oxygen 13 , thereby enabling rapid removal of molecular oxygen and a fast responding rate.…”

Section: Materials Design and Fabricationmentioning

confidence: 99%

“…Such phenomena have found practical applications in various elds, such as data recording 6,7 and display. [3][4][5]7 In particular, PIOM materials capable of "write-read-erase" cycling are of most interest for their capability of reversible edition [7][8][9][10][11][12][13][14][15][16][17] . Utilizing these materials, programmable graphic data edition has been achieved and applied in various elds including optical storage 7,8,12 , anti-counterfeiting 14 , bio-imaging 15 , and patterning 9,11,13,16,17 .…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5]7 In particular, PIOM materials capable of "write-read-erase" cycling are of most interest for their capability of reversible edition [7][8][9][10][11][12][13][14][15][16][17] . Utilizing these materials, programmable graphic data edition has been achieved and applied in various elds including optical storage 7,8,12 , anti-counterfeiting 14 , bio-imaging 15 , and patterning 9,11,13,16,17 . Typically, the visualization of recorded optical data involves the regional change of photophysical properties including absorption [7][8][9][10] , re ection 9,10 , or photoluminescence (PL) 8,[11][12][13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

“…Utilizing these materials, programmable graphic data edition has been achieved and applied in various elds including optical storage 7,8,12 , anti-counterfeiting 14 , bio-imaging 15 , and patterning 9,11,13,16,17 . Typically, the visualization of recorded optical data involves the regional change of photophysical properties including absorption [7][8][9][10] , re ection 9,10 , or photoluminescence (PL) 8,[11][12][13][14][15][16][17] . Unlike others, the PL signal requires speci c excitation, which therefore guarantees advanced data con dentiality in anti-counterfeit and optical encryption applications.…”

Section: Introductionmentioning

confidence: 99%

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Photo-induced Afterglow of Carbon Dots for Dynamic Patterning

Liu¹,

Huang²,

Niu³

et al. 2020

Preprint

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Flexible materials with afterglow feature have received considerable attention in the field of flexible electronics. To date, it is still a formidable challenge to develop flexible materials with dynamic long afterglow for practical applications. Herein, we report for the first time photo-induced long afterglow in a flexible solid composite film made of luminescent carbon dots (CDs) and the oxygen-permeable poly pyrrolidone (PVP). The phosphorescent afterglow of the film can be reversibly activated by photo-irradiation and de-activated by thermal treatment. Impressively, the photo-activation leads to a significant luminescence lifetime enhancement with a factor of over 3900, and editable afterglow patterns with fine resolution exceeding 1280 dpi are readily achieved by masking and lithography. Furthermore, the retention time of such memorized optical patterns can be tuned from minutes to days by varying temperature, enabling the unique time-temperature indicating function. These findings not only enrich both the library of the afterglow materials vastly, but also extend the scope of the potiential applications of CDs materials.

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Section: Veri Cation Of the Oxygen-mediated Mechanismmentioning

confidence: 97%

Section: Materials Design and Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Photo-induced Afterglow of Carbon Dots for Dynamic Patterning

Liu¹,

Huang²,

Niu³

et al. 2020

Preprint

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show abstract

Room‐Temperature Phosphorescence Enabled through Nacre‐Mimetic Nanocomposite Design

et al. 2020

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A generic, facile, and waterborne strategy is introduced to fabricate flexible, low‐cost nanocomposite films with room‐temperature phosphorescence (RTP) by incorporating waterborne RTP polymers into self‐assembled bioinspired polymer/nanoclay nanocomposites. The excellent oxygen barrier of the lamellar nanoclay structure suppresses the quenching effect from ambient oxygen (kq) and broadens the choice of polymer matrices towards lower glass transition temperature (Tg), while providing better mechanical properties and processability. Moreover, the oxygen permeation and diffusion inside the films can be fine‐tuned by varying the polymer/nanoclay ratio, enabling programmable retention times of the RTP signals, which is exploited for transient information storage and anti‐counterfeiting materials. Additionally, anti‐interception materials are showcased by tracing the interception‐induced oxygen history that interferes with the preset self‐erasing time. Merging bioinspired nanocomposite design with RTP materials contributes to overcoming the inherent limitations of molecular design of organic RTP compounds, and allows programmable temporal features to be added into RTP materials by controlled mesostructures. This will assist in paving the way for practical applications of RTP materials as novel anti‐counterfeiting materials.

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Enhancement of Solid‐State Reversible Photochromism by Incorporation of Rigid Steric Hindrance Groups

Yang

et al. 2020

Advanced Optical Materials

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which have attracted considerable research attention. Spiropyran can change from its closed form to the merocyanine (MC) structure under ultraviolet (UV) light, and recover its original form by visible light or heat treatment. [7] Other external stimuli, such as acids or bases, [8] metal ions, and redox potentials [7a,c] can also achieve this reversible isomerization. Unfortunately, most of these stimulus-induced conversions can only occur in solution or soft materials and are hampered in the solid state. As a result, one of the main tasks in the development of solid-state photoresponsive materials for practical applications is achieving an effective stimulus-induced conversion in the solid state. The reason for the limited cis−trans isomerization in the solid state is the lack of intrinsic structural flexibility, which is required to release stress and strain during the stimulus-induced transformation. The main problem lies in the photo-switching of SP compounds, because of their strong molecular packing in the aggregated state. Such close molecular packing mainly hinders the cis−trans isomerization, which occurs during photochemical reactions between the SP and MC isomers. Hence, an effective way to solve the current challenges in solid-state photoswitching is to create large free volumes during the isomerization. There are two common methods to achieve this goal. One involves the copolymerization of spiropyran with polymer monomers. [9] For example, Li et al. fabricated a reversible photochromic nanofiber membrane by copolymerizing spiropyran with octadecyl acrylate and blending it with polyvinyl alcohol (PVA)/polyethylenimine (PEI). [9a] However, polymerization is relatively complex and involves rather harsh reaction conditions. Another approach involves the modification of spiropyran with large steric organic molecules. In a previous study, the main goal was to introduce long flexible chains in spiropyran, to increase the free volume. [10] However, long chains always led to a decrease in the thermal stability, and the photochromic properties did not show an obvious enhancement. Currently, researchers are mainly focusing on introducing rigid steric hindrance groups to improve the photochromic properties and the thermal stability. [11] The Xu and Yin's groups reported that the solid-state photochromism of spiropyran was improved by introducing aggregation-induced emission (AIE) molecules, owing to their highly twisted structures, which induced loose packing and provided a larger free volume in the aggregated state. [12] In addition, the Yin group reported that the introduction of naphthalimide provided sufficient free Solid-state materials with reversible properties are highly attractive, owing to versatile applications in security, sensors, bioimaging, and information storage. Unfortunately, obtaining these materials in the solid state remains a huge challenge. Efficient isomerization usually requires sufficient conformational freedom and cannot be achieved without solvents or matrices. In this study, four st...

show abstract

Photo-writing self-erasable phosphorescent images using poly(N-vinyl-2-pyrrolidone) as a photochemically deoxygenating matrix

Abstract: Light and oxygen dancing the rhumba: phosphorescent images could be written in PVP by photo-activation and be competitively erased by diffusional oxygen quenching.

Cited by 17 publications

References 38 publications

Photo-induced Afterglow of Carbon Dots for Dynamic Patterning

Photo-induced Afterglow of Carbon Dots for Dynamic Patterning

Room‐Temperature Phosphorescence Enabled through Nacre‐Mimetic Nanocomposite Design

Enhancement of Solid‐State Reversible Photochromism by Incorporation of Rigid Steric Hindrance Groups

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