Ultralong-lived room temperature phosphorescence from N and P codoped self-protective carbonized polymer dots for confidential information encryption and decryption

Wang, Zifei; Shen, Jian; Sun, Jiazhen; Xu, Bin; Gao, Zhenhua; Wang, Xue; Yan, Liting; Zhu, Chaofeng; Meng, Xianwei

doi:10.1039/d0tc05845a

Cited by 55 publications

(50 citation statements)

References 47 publications

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“…The encryption patterns of “O” and “V” are formed by spraying G‐CPDs, while the reference patterns of “L” and “E” are generated by using our previously prepared RTP emitting CPDs (Figure S31, Supporting Information). [ 38 ] The encrypted patterns of “O” and “V” are indistinguishable until the sample is further thermally annealed. The above demonstrations suggest that multicolor RTP emitting CPDs developed herein offers advanced platforms for anti‐counterfeiting applications.…”

Section: Resultsmentioning

confidence: 99%

Thermally Driven Amorphous‐Crystalline Phase Transition of Carbonized Polymer Dots for Multicolor Room‐Temperature Phosphorescence

Wang

Shen

et al. 2021

Advanced Optical Materials

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Multicolor carbon dot (CD)‐based nanomaterials offer a variety of opportunities for potential applications in bioimaging, optoelectronic devices, and information security. However, it still remains a challenge to modulate the conjugated π‐structure of CDs to achieve multicolor room‐temperature phosphorescence (RTP). Herein, the authors present a strategy based on thermally driven amorphous−crystalline phase transition to achieve multicolor carbonized polymer dots (CPDs) with the emission color tunable from green to orange‐red. This is the first report on multicolor RTP emission from CDs by means of thermal stimulus. Further investigations reveal that the formation of self‐protective covalently crosslinked frameworks and codoping of multiple heteroatoms play a crucial role in the production of RTP. RTP color tunability can be attributed to different crystalline contents of the conjugated π‐domain within CPDs. Potential application of the developed CPDs as printable and writable security inks for advanced multilevel anti‐counterfeiting and encryption is demonstrated. This work paves a path for the development of multicolor RTP materials and suggests great potential of CDs in exploiting novel optical materials toward intriguing applications.

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Section: Resultsmentioning

confidence: 99%

Thermally Driven Amorphous‐Crystalline Phase Transition of Carbonized Polymer Dots for Multicolor Room‐Temperature Phosphorescence

Wang

Shen

et al. 2021

Advanced Optical Materials

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“…These results demonstrate that a lattice spacing of 0.21 nm is in agreement with the in-plane lattice spacing of graphene (100 facets) and the spacing between graphite layers (100 facets). 18 What is more, as shown in Figure 2c, it is the corresponding particle size distribution histogram of Figure 2a, which revealed that the diameter of the as-prepared CPDs is in the range from 2.3 to 8.2 nm with an average size of 3.5 nm. The AFM image in Figure 2b,d shows the topographic height of the CPDs, which is similar to that of the TEM image.…”

Section: Resultsmentioning

confidence: 71%

“…From the top inset of Figure a, we can see that the CPDs have a polymer structure with a lower carbonization degree, while the CPDs at the bottom of the inset of Figure a have a polymer/carbon hybrid structure. These results demonstrate that a lattice spacing of 0.21 nm is in agreement with the in-plane lattice spacing of graphene (100 facets) and the spacing between graphite layers (100 facets) . What is more, as shown in Figure c, it is the corresponding particle size distribution histogram of Figure a, which revealed that the diameter of the as-prepared CPDs is in the range from 2.3 to 8.2 nm with an average size of 3.5 nm.…”

Section: Resultsmentioning

confidence: 99%

Simple and Green Synthesis of Carbonized Polymer dots from Nylon 66 Waste Fibers and its Potential Application

Wang

Liu

et al. 2021

ACS Omega

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Carbonized polymer dots (CPDs) have attracted widespread attention owing to their unique properties and are usually prepared from monomers of polymers or polymers. To reduce the waste of high-value petropolymers and environmental pollution, a simple and green method for the preparation of CPDs using a hydrothermal technique based on the cross-linking enhanced emission effect was proposed, in which nylon 66 waste fibers were used as a precursor and glutaraldehyde as a crosslinking agent. The as-prepared CPDs possessed polymer/carbon hybrid structures with a 3.5 nm average diameter, and hydroxyl (−OH), carboxyl (−COOH), and amino (−NH 2 ) groups were present on the surface of CPDs. It can be found that the asprepared CPDs display excitation-dependent photoluminescence emission, which is mainly attributed to the molecular state luminescence center. Because the molecular state fluorescence of CPDs could be affected by the presence of Fe 3+ and the change of pH values, the as-prepared CPDs can be used as a probe for the detection of the concentration of Fe 3+ and the pH variations of solution. The fluorescence intensity of CPDs was selectively quenched by Fe 3+ in the range from 1 to 145 μM. In virtue of the static quenching of CPDs by Fe 3+ , a sensing system was fabricated for the quantitative detection of Fe 3+ , and its limit of detection was 0.1 μM. Based on the electrostatic doping/charging of CPDs, a pH sensor was fabricated. It showed that the fluorescence intensity of CPDs decreased along with the increase of pH from 2.60 to 12.6. What is more, the CPDs were found to be an alternative to traditional fluorescent inks for encryption and information storage.

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“…These characters show fluorescence under 365 nm UV light irradiation and display green phosphorescence after the 365 nm UV light is turned off. The Cl-CNDs may find applications in different fields such as fluorescent sensors, phosphorescent glow-in-the-dark materials, and security encryption ( Long et al, 2018 ; Wang et al, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

Room Temperature Phosphorescence of Chlorine Doped Carbon Nitride Dots

Patir

Gogoi

2022

Front. Chem.

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Metal free room temperature phosphorescent materials have been the subject of considerable attention due to their potential applications in optoelectronic devices sensing, and security and safety signage. This study discusses how efficient fluorescent and phosphorescent chlorine doped carbon nitride dots (Cl-CNDs) were prepared by thermal treatment of guanidine hydrochloride. The Cl-CNDs prepared were characterized by field emission scanning electron microscope, dynamic light scattering, PXRD, EDX, Thermo gravimetric analysis, FT-IR, and UV-Visible spectroscopy. The Cl-CNDs exhibit a long phosphorescence lifetime of 657 ms and the phosphorescence quantum yield was found to be 2.32% upon being excited at 360 nm in ambient conditions. Formation of compact coreparticles via condensation along with hydrogen bonding of Cl-CNDs by its functional groups facilitate intersystem crossing and stabilizes the triplet states, favoring room temperature phosphorescence. The cost effective preparation and tunable optical properties of Cl-CNDs may find applications in security encryption and optoelectronic devices.

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Ultralong-lived room temperature phosphorescence from N and P codoped self-protective carbonized polymer dots for confidential information encryption and decryption

Abstract: Room-temperature phosphorescent (RTP) carbon dots offer unique opportunities in information security applications, but the delay time of such materials reported thus far is typically shorter than 10 s and thus...

Cited by 55 publications

References 47 publications

Thermally Driven Amorphous‐Crystalline Phase Transition of Carbonized Polymer Dots for Multicolor Room‐Temperature Phosphorescence

Thermally Driven Amorphous‐Crystalline Phase Transition of Carbonized Polymer Dots for Multicolor Room‐Temperature Phosphorescence

Simple and Green Synthesis of Carbonized Polymer dots from Nylon 66 Waste Fibers and its Potential Application

Room Temperature Phosphorescence of Chlorine Doped Carbon Nitride Dots

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