Photo‐Stimulated Polychromatic Room Temperature Phosphorescence of Carbon Dots

Jiang, Kai; Hu, Sizhe; Wang, Yuci; Li, Zhongjun; Lin, Hengwei

doi:10.1002/smll.202001909

Cited by 160 publications

(81 citation statements)

References 73 publications

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“…Another interesting phenomenon, RTP, can also be observed when some kind of CPDs aggregate. [71,[115][116][117][118][119][120][121][122][123][124][125] Generally, phosphorescence is more difficult to achieve than fluorescence because it usually undergoes triplet exciton transi-tions with spin-forbidden nature. [126,127] The long lifetime of triplet exciton is easy to be dissipated by nonradiative decay process at room temperature.…”

Section: Aggregation-induced Room Temperature Phosphorescencementioning

confidence: 99%

Aggregation and luminescence in carbonized polymer dots

et al. 2022

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The aggregate luminescence behavior of organic luminescent materials has been studied extensively. As a new kind of luminescent nanomaterials, carbonized polymer dots (CPDs) not only inherit the stability and biocompatibility of carbon materials, but also possess the luminescence tunability, water solubility, and high photoluminescence quantum yield of organic luminescent materials, rendering them a strong candidate for the next generation of light-emitting materials. Previously, people mainly understood its luminescence from the perspective of carbon materials, but some luminescence mechanisms are still unclear. In this review, we discuss the luminescence mechanism by referring to organic luminescent materials with emphasis on their aggregation behavior. Firstly, three representative aggregate luminescence phenomena of organic luminescent materials are briefly introduced. Chromophores present in CPDs are elaborated to further discuss the potential interactions between them, with emphasis on the role of crosslinked polymer networks. On this basis, some special luminescence phenomena of CPDs in the aggregate state are summarized, and relevant mechanisms are discussed in detail to consolidate relevant statements.

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Section: Aggregation-induced Room Temperature Phosphorescencementioning

confidence: 99%

Aggregation and luminescence in carbonized polymer dots

et al. 2022

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“…So far, solid CDs‐based RTP has made great progress in long lifetime, multicolor emission, and dynamic changes, [ 7–13 ] but the interruption of phosphorescence or poor dispersion of the materials in water still limits their practical application in anti‐counterfeiting and biological imaging. [ 14 ] Therefore, developing CDs‐based RTP materials with good dispersion and maintaining intensive phosphorescence in aqueous environment, remains a challenging task, which has aroused great interest among researchers.…”

Section: Introductionmentioning

confidence: 99%

Cascade Resonance Energy Transfer for the Construction of Nanoparticles with Multicolor Long Afterglow in Aqueous Solutions for Information Encryption and Bioimaging

Líu

Liu

et al. 2022

Advanced Optical Materials

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There are still huge challenges in the development of carbon dots (CDs) based long afterglow materials with multicolor emissions, especially in aqueous solutions. This work reports a novel strategy of achieving of multicolor long afterglow in aqueous solution by incorporating phosphorescent CDs and fluorescent dyes into sub‐20 nm monodispersed silica nanoparticles. The silica matrix not only stabilizes the triplet excitons of CDs but also facilitates the efficient cascade Förster resonance energy transfer between the phosphorescent donor (CDs) and the energy acceptor (fluorescent dyes), which enables intensive multicolor long afterglow with adjustable wavelength from 510 to 610 nm and the largest Stokes shift of 255 nm. Based on these multicolor long afterglow nanoparticles, some time‐resolved, color multiple information encryptions are designed. By eliminating background noise, the signal‐to‐noise ratio of in vivo afterglow imaging is as high as 155.1 in the in vivo imaging system. Interestingly, the afterglow signal in mice can be easily and conveniently collected by the camera of cell phones, which may make in vivo bioimaging portable and inexpensive. This study will provide new ideas for the synthesis of multicolor CDs‐based long afterglow materials in solutions.

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“…In both of the above cases, hydrogen bonding interactions between the emissive units of CDs and matrices/CDs' frameworks usually play a critical role to stabilize the excited triplet states and so as to activate their afterglows [21,22,25,26]. Although afterglow emission wavelengths from CDs-based materials have been successfully regulated from green to red region [27][28][29][30][31], NIR afterglow from CDs has not yet been reported so far, not to mention the NIR-containing dual-/multi-mode afterglows.…”

Section: Introductionmentioning

confidence: 99%

Green and Near-Infrared Dual-Mode Afterglow of Carbon Dots and Their Applications for Confidential Information Readout

Wang

Jiang

et al. 2021

Nano-Micro Lett.

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Near-infrared (NIR), particularly NIR-containing dual-/multi-mode afterglow, is very attractive in many fields of application, but it is still a great challenge to achieve such property of materials. Herein, we report a facile method to prepare green and NIR dual-mode afterglow of carbon dots (CDs) through in situ embedding o-CDs (being prepared from o-phenylenediamine) into cyanuric acid (CA) matrix (named o-CDs@CA). Further studies reveal that the green and NIR afterglows of o-CDs@CA originate from thermal activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) of o-CDs, respectively. In addition, the formation of covalent bonds between o-CDs and CA, and the presence of multiple fixation and rigid effects to the triplet states of o-CDs are confirmed to be critical for activating the observed dual-mode afterglow. Due to the shorter lifetime and insensitiveness to human vision of the NIR RTP of o-CDs@CA, it is completely covered by the green TADF during directly observing. The NIR RTP signal, however, can be readily captured if an optical filter (cut-off wavelength of 600 nm) being used. By utilizing these unique features, the applications of o-CDs@CA in anti-counterfeiting and information encryption have been demonstrated with great confidentiality. Finally, the as-developed method was confirmed to be applicable to many other kinds of CDs for achieving or enhancing their afterglow performances.

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Photo‐Stimulated Polychromatic Room Temperature Phosphorescence of Carbon Dots

Cited by 160 publications

References 73 publications

Aggregation and luminescence in carbonized polymer dots

Aggregation and luminescence in carbonized polymer dots

Cascade Resonance Energy Transfer for the Construction of Nanoparticles with Multicolor Long Afterglow in Aqueous Solutions for Information Encryption and Bioimaging

Green and Near-Infrared Dual-Mode Afterglow of Carbon Dots and Their Applications for Confidential Information Readout

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