Color tunable room temperature phosphorescent carbon dot based nanocomposites obtainable from multiple carbon sources <i>via</i> a molten salt method

Wang, Chan; Chen, Yueyue; Hu, Tantan; Chang, Yong Keun; Ran, Guoxia; Wang, Mei; Song, Qijun

doi:10.1039/c9nr03038g

Cited by 82 publications

(91 citation statements)

References 43 publications

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“…Due to the inefficient intersystem crossing (ISC) based on weak spin-orbit coupling and the high nonradiative decay rate of the triplet excitons as well as quenching factors like oxygen, different strategies to achieve RTP have been developed in recent years. Among those, host-guest doping, [20][21][22][23] H-aggregation, [10,[24][25][26][27][28] supramolecular frameworks, [24] polymers, [29][30][31][32][33][34][35][36][37][38] carbon dots, [39][40][41][42][43] and small molecules [44] can be found. In any case, the emitting molecules must be embedded in a rigid environment, be it a crystalline structure or a polymer host, causing a confinement of molecular motion.…”

Section: Doi: 101002/adma202000880mentioning

confidence: 99%

Aromatic Phosphonates: A Novel Group of Emitters Showing Blue Ultralong Room Temperature Phosphorescence

et al. 2020

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In recent years, there has been a growing interest in purely organic materials showing ultralong room‐temperature phosphorescence with lifetimes in the range of seconds. Still, the longest known phosphorescence lifetimes are only achieved with crystalline systems so far. Here, a rational design of a completely new family of halogen‐free organic luminescent derivatives in amorphous matrices, displaying both conventional fluorescence and phosphorescence is reported. Hydrogen bonding between the newly developed emitters and an ethylene‐vinyl alcohol copolymer (Exceval) matrix, which efficiently suppresses vibrational dissipation, enables bright long‐lived phosphorescence with lifetimes up to 2.6 s at around 480 nm. The importance of the chosen matrix is shown as well as the implementation in an organic programmable luminescent tag.

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Section: Doi: 101002/adma202000880mentioning

confidence: 99%

Aromatic Phosphonates: A Novel Group of Emitters Showing Blue Ultralong Room Temperature Phosphorescence

et al. 2020

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“…After completely dry, the blue color number “8888” under a hand‐held UV lamp (λ=365 nm). Once the UV lamp is switched off, the yellow‐green color number “0172” are visible owing to the delayed RTP of the C‐dots . The feasibility of the application of the RTP C‐dots in information encryption and decryption is successfully demonstrated.…”

Section: Figurementioning

confidence: 99%

Matrix‐Free and Highly Efficient Room‐Temperature Phosphorescence Carbon Dots towards Information Encryption and Decryption

Zhang

et al. 2020

Chemistry An Asian Journal

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Designing efficient room-temperature phosphorescence (RTP) carbon dots (C-dots) without the need of an additional matrix is important for various applications. Herein, matrix-free and highly efficient C-dots with yellowgreen RTP emission have been successfully synthesized towards information encryption and decryption. Phytic acid (PA) and triethylenetetramine are used as molecular precursors, and a facile microwave-assisted heating method is selected as synthesis method. The obtained C-dots exhibit a maximum phosphorescence emission at around 535 nm under an excitation wavelength of 365 nm and a long average lifetime up to 750 ms (more than 9 s to the naked eye). PA containing six phosphate groups and serving as P source plays a significant role in producing the RTP C-dots. Furthermore, potential applications of the RTP C-dots in the field of information encryption and decryption are successfully demonstrated.[a] Dr.

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“…[13,[16][17][18][19][20][21][22][23][24]. Interestingly, RTP phenomena of CDs have been discovered recently by embedding or immobilizing in a variety of matrices, including poly (vinyl alcohol), polyurethane, layered double hydroxides, urea/biuret, zeolites and so on [25][26][27][28][29][30][31][32][33][34][35][36]. Although the introduction of matrices could realize RTP of CDs, the inherent chemical and physical properties of matrices would hinder applications of the RTP properties of CDs.…”

Section: Introductionmentioning

confidence: 99%

Visible-Light-Excited Room Temperature Phosphorescent Carbon Dots

Jiang

Wang

et al. 2020

Nanomaterials

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Carbon dots (CDs) with a room temperature phosphorescent (RTP) feature have attracted considerable interest in recent years due to their fundamental importance and promising applications. However, the reported matrix-free RTP CDs only show short-wavelength (green to yellow) emissions and have to be triggered by ultraviolet (UV) light (below 400 nm), limiting their applications in certain fields. Herein, visible-light-excited matrix-free RTP CDs (named AA-CDs) with a long-wavelength (orange) emission are reported for the first time. The AA-CDs can be facilely prepared via a microwave heating treatment of L-aspartic acid (AA) in the presence of ammonia and they emit unique orange RTP in the solid state with visible light (420 nm) excitation just being switched off. Through the studies of the carbonization process, the C=O and C=N containing moieties in the AA-CDs are confirmed to be responsible for the observed RTP emission. Finally, the applications of AA-CDs in information encryption and anti-counterfeiting were preliminarily demonstrated.

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Color tunable room temperature phosphorescent carbon dot based nanocomposites obtainable from multiple carbon sources via a molten salt method

Abstract: The structural confinement and charge density engineering of molten salt endorsed CD-based room temperature phosphorescent (RTP) nanocomposites with long-lifetime, long-wavelength and excitation-dependent RTP.

Cited by 82 publications

References 43 publications

Aromatic Phosphonates: A Novel Group of Emitters Showing Blue Ultralong Room Temperature Phosphorescence

Aromatic Phosphonates: A Novel Group of Emitters Showing Blue Ultralong Room Temperature Phosphorescence

Matrix‐Free and Highly Efficient Room‐Temperature Phosphorescence Carbon Dots towards Information Encryption and Decryption

Visible-Light-Excited Room Temperature Phosphorescent Carbon Dots

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