Nanomaterials
·
2020
·Vol. 10
·期 3
·464
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IF 4.324
Sizhe Hu,Kai Jiang,Yuci Wang,Sui Wang,Zhongjun Li,Hengwei Lin
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.Keywords:carbon dots;room temperature phosphorescence;visible-light-excitation;anti-counterfeiting
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zhuoyu Wang,Jiajia Shan,Kunpeng Yu,Lang Huang,Qiong Wu
In response to the critical challenges of high toxicity, complex synthesis, and poor environmental stability in conventional room-temperature phosphorescent materials, this study presents a sustainable biomass-derived strategy through the development of lignin-based carbon dot/inorganic salt composites (CDSL X -T). By employing a one-step molten salt approach, we construct a hierarchical architecture featuring lignin-derived sp 2 -hybridized carbon cores and a rigid crystalline shell comprising multi-component inorganic salts (MgO/Mg 3 (PO 4 ) 2 /KCl/KNO 3 ). The inherent conjugated moieties of lignin facilitate efficient intersystem crossing, while nitrogen doping optimizes (n, π*) electronic configurations to enhance spin-orbit coupling effects. In situ characterization elucidates the synergistic mechanism of high-temperature-induced carbon core aromatization and salt matrix crystallization. A dual confinement strategy-combining covalent bonding (C-K/C-Cl/C-Mg) and spatial restriction-effectively suppresses carbon dot vibrations and non-radiative triplet exciton transitions, enabling stable phosphorescence emission in aqueous environments. Leveraging time-resolved luminescence characteristics with tunable lifetimes, the material demonstrates unique potential in fingerprint visualization and multilevel information encryption. This work establishes an eco-friendly synthetic paradigm for high-performance bio-based optical materials, bridging sustainable chemistry with advanced photonic applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3388
·
IF 4.6
Shuai Meng,Dengke Cheng,Hailing Gu,Yuchen Li,Yukun Qin,Jing Tan,Qijun Li
Mechano-luminescent materials that exhibit distinct luminescence responses to force stimuli are urgently anticipated in view of application needs in the fields of sensing, anti-counterfeiting, optoelectronic devices, etc. However, most of the reported materials normally exhibit force-induced changes in luminescent intensity, whereas materials that possess force-induced color-variable luminescence remain rarely reported. Herein, for the first time, a novel mechanical force-induced color-variable luminescence material from carbon dots (CDs) in boric acid (CD@BA) is reported. At low CDs concentration, the luminescence of CD@BA exhibits a grinding-induced color variable from white to blue. This grinding-induced color variable can be switched to yellow-to-white changing by increasing the CDs concentration in BA. The grinding-induced color-variable luminescence originates from dynamic variation in emission ratio of fluorescence and room temperature phosphorescence, due to the influence of oxygen and water vapor in the air. At high CDs concentration, short-wavelength fluorescence undergoes more severe reabsorption compared to room temperature phosphorescence, leading to grinding-induced color-variable switching from white-to-blue to yellow-to-white. Based on the unique properties of CD@BA powder, the applications of recognizing and visualizing fingerprints on the surfaces of various of materials are demonstrated.Keywords:carbon dots;force-induced color-variable luminescence;fluorescence;room temperature phosphorescence
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhijian Song,Yingliang Liu,Xiaomin Lin,Zhishan Zhou,Xuejie Zhang,Jianle Zhuang,Bingfu Lei,Chaofan Hu
Room-temperature phosphorescence (RTP) with carbon dots (CDs) can be exploited further if the mechanism of trap-state-mediated triplet-state energy transfer is understood and controlled. Herein, we developed an in situ calcination method for the preparation of a CDs@ZnAl2O4 composite material that exhibits unique UV and visible light-excitable ultra-broad-band RTP. The ZnAl2O4 matrix can protect the triplet emissions of CDs by the confinement effect and spin–orbit coupling. In addition, benefitting from the efficient energy transfer between the inorganic trap state and the triplet state of CDs, the special yellow to red RTP of CDs@ZnAl2O4 composites can be realized. A slow-decaying phosphorescence at 570 nm with a lifetime of 1.05 s and a fast-decaying phosphorescence at 400 nm with a lifetime of 0.41 s were observed with UV irradiation of 290 nm, which originated from the surface and core triplet states of CDs, respectively. Based on the unique RTP performance, anti-counterfeiting and information encryption were successfully realized using the CDs@ZnAl2O4 composites with LED light or UV light.
研究领域:
材料科学
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光电技术
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纳米技术
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2024
·
IF 7.9
Wei-Ming Yin,Ben Dang,Yuanyuan Miao,Shujun Li,Jian Li,Shouxin Liu,Tony D. James,Zhijun Chen
Producing room temperature phosphorescent materials from natural sources is essential for sustainability. However, either toxic chemical reagents or complicated processing is still required to produce such phosphorescent materials derived from natural resources. Here, we produce sustainable room temperature phosphorescence (RTP) materials from wood and sugar. Specifically, sugar is introduced into a wood matrix, which confines the lignin in the wood matrix in situ . As a result, the treated wood (sucrose wood [S-wood]) exhibited RTP emissions with a lifetime of ∼284.4 ms. Life cycle carbon analysis indicates that ∼8.1–11.2 kg CO 2 is produced during the preparation of S-wood, which is lower than for other similar materials. Moreover, the S-wood could be naturally degraded in the soil over 40 days. As a demonstration of the practical potential, S-wood is used for visual decorations and anti-counterfeiting applications.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shenghui Han,Gang Lian,Xu Zhang,Zhaozhen Cao,Qilong Wang,Deliang Cui,Ching-Ping Wong
Developing metal-free room-temperature phosphorescence (RTP) materials with ultralong lifetimes in dry and wet states simultaneously has been widely concerned due to their potential applications, which is also a tough challenge up to now. Herein, a smart construction strategy is proposed to in-situ embed boron nitride dots (BNDs) into an isogenous B 2 O 3 matrix. The BND-based materials exhibit unexpected bluish-green RTP in solid and various wet conditions (water, oxidants, organic solvents, strong acids and bases). The RTP lifetime of them in powder is as long as ~ 1.7 s, lasting over 10 s to naked eye. B 2 O 3 matrix can not only uniformly disperse the BNDs in it, but also provide a rigid environment via forming hydrogen-bonded and covalently bonded interactions between them to strongly stabilize the triplet states excitions on the dots from nonradiative deactivation. More interestingly, RTP quenching of the BND-based powder in various solutions is effectively suppressed because the B 2 O 3 matrix is not collapsed in them. For instance, the RTP lifetime in water is as long as ~ 0.9 s. Based on the distinctive RTP properties in dry and various harsh wet states, the applications of the BND-based RTP materials in multi-level anti-counterfeiting and information encryption are demonstrated.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 13
·2210
·
IF 5.719
Huiyong Wang,Hongmei Yu,Ayman AL-Zubi,Xiuhui Zhu,Guochao Nie,Shaoyan Wang,Wei Chen
The synthesis of room temperature phosphorescent carbon dots (RTP-CDs) without any matrix is important in various applications. In particular, RTP-CDs with dual modes of excitation are more interesting. Here, we successfully synthesized matrix-free carbonized polymer dots (CPDs) that can generate green RTP under visible and ultraviolet light dual-mode excitation. Using acrylic acid (AA) and ammonium oxalate as precursors, a simple one-pot hydrothermal method was selected to prepare AA-CPDs. Here, acrylic acid is easy to polymerize under high temperature and high pressure, which makes AA-CPDs form a dense cross-linked internal structure. Ammonium oxalate as a nitrogen source can form amino groups during the reaction, which reacts with a large number of pendant carboxyl groups on the polymer chains to further form a cross-linked structure. The carboxyl and amino groups on the surface of AA-CPDs are connected by intermolecular hydrogen bonds. These hydrogen bonds can provide space protection (isolation of oxygen) around the AA-CPDs phosphor, which can stably excite the triplet state. This self-matrix structure effectively inhibits the non-radiative transition by blocking the intramolecular motion of CPDs. Under the excitation of WLED and 365 nm ultraviolet light, AA-CPDs exhibit the phosphorescence emission at 464 nm and 476 nm, respectively. The naked-eye observation exceeds 5 s and 10 s, respectively, and the average lifetime at 365 nm excitation wavelength is as long as 412.03 ms. In addition, it successfully proved the potential application of AA-CPDs in image anti-counterfeiting.Keywords:carbon dots;room temperature phosphorescence;visible/ultraviolet light excitation;anti-counterfeiting
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Advances
·
2022
·Vol. 8
·期 8
·
IF 14.957
Dan Li,Jie Yang,Manman Fang,Ben Zhong Tang,Zhen Li
Achieving stimulus-responsive ultralong room temperature phosphorescence (RTP) in organic materials especially with full-color tunable emissions is attractive and important but rarely reported. Here, a strategy was reported to realize stimulus-responsive RTP effect with color-tunable emissions by using water as solvent in the preparation process without any organic solvent through covalent linkage of arylboronic acids with different π conjugations and polymer matrix of polyvinyl alcohol. The yielded polymer films exhibit outstanding RTP performance (2.43 s). Furthermore, an excitation-dependent RTP film was obtained, and the afterglow color changes from blue to green, then to red as the excitation wavelength increases. The RTP property of all the above materials is sensitive to water and heat stimuli, because the rigidity of the system could be broken by water. Last, they were successfully applied in a multilevel information encryption and multicolor paper and ink.
研究领域:
材料科学
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光学材料
·
高分子科学
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刺激响应材料
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磷光
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信息安全
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2024
·
IF 10.4
Liu Yao,Chen Jinzheng,Miao Yiling,Zhang Kaimin,Lin Faxu,Huang Huahua,Zhang Lina,Yang Zhan,Zhang Yi,Chi Zhenguo,Yang Zhiyong
Despite great achievements obtained for polymer-based room-temperature phosphorescence (RTP) materials, the limited efficiencies of persistent RTP still hinder their development. Herein, a simple and universal strategy of using the dual-functional additive of Cs + was presented, which could simultaneously enhance the efficiency ( Φ p ) and maintain the long lifetime ( τ p ) of RTP in existing polymer-based systems with various phosphors and polymers. Among them, the commercial emitter (TpB)-doped polyvinyl alcohol (PVA)/Cs 2 CO 3 system possessed an extremely high Φ p up to 75.5% and still maintained a long τ p of 2.13 s, by introducing the heavy-atom effect and an extra network of ionic bonding through the Cs + additive. Additionally, the temperature resistance of RTP in TpB@PVA/Cs + film could also be improved to 85 °C. More satisfactorily, the efficiency of Förster resonance energy transfer (FRET) from RTP to near-infrared (NIR) was also remarkably enhanced in the multi-component systems. This work provides a simple and universal strategy for developing polymer systems with high RTP performance.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Yifang Gao,Huilin Zhang,Yuan Jiao,Wenjing Lu,Yang Liu,Hui Han,Xiaojuan Gong,Shaomin Shuang,Chuan Dong
Activating room-temperature phosphorescence (RTP) emission in aqueous environments is a challenging feat because of the releasing of nonradiative decay pathways. Here, a design strategy was presented that effectively promotes the presence of RTP of carbon dots (CDs) in aqueous solutions by utilizing CDs and melamine to construct hydrogen-bonded networks to form a polymer (M-CDs). The obtained M-CDs not only enjoy an ultralong phosphorescence lifetime of 664 ms, but also relatively high quantum yield of 25% in an aqueous environment at 468 nm excitation. This is also a rare example of achieving RTP of CDs with a solid state in an aqueous environment. Further investigations reveal that the hydrogen-bonded networks are critical to the implementation of RTP in an aqueous environment. The existence of covalent bonds in CDs and melamine further stabilizes the hydrogen-bond skeleton and triplet state. Furthermore, the bound water formed inside the M-CDs also plays an indispensable role in stabilizing the RTP in the aqueous solution. Given the feature, the M-CDs are used to effectively implement double data encryption and decryption. In addition, this strategy is universal for most phosphorescence materials. This result will pave the way toward expanding RTP materials and their applications in aqueous environments.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 17
·6333-6340
·
IF 5.7
Ziguo He,Mukfung Yuen,Cheng Zhang,Jian Zhang,Zhicai Wang,Caibo Yue,Mingfu Ye,Kui Zhang
Coal-derived carbon dots inherit the rich functional groups of raw coal, which makes them easy to be modified, and have important applications in chemical analysis, biomedicine, optoelectronic devices and other fields due to their excellent properties. In this work, we achieved room-temperature phosphorescence (RTP) emission of coal-based humic acid-derived carbon dots (HACDs) in boric acid for the first time. The results show that the boron–carbon bonds are prone to generate between HACDs and boric acid under heating conditions. Besides, the surface of the prepared HACDs contains numerous phenolic hydroxyl groups, which are easily oxidized by hydrogen peroxide into carbonyl groups, improving the phosphorescence lifetime. The resultant RTP materials exhibit an ultra-long phosphorescence lifetime of 632.20 ms with an outstanding afterglow as long as 9.0 s, and the phosphorescence quantum yield is 7.6%. This work provides guidance for finding earth-abundant and cost-effective carbon sources and a novel means to modulate the emission mechanism of coal-derived carbon dots.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yifang Gao,Shaogang Lei,Chuan Dong
The phenomenon of long afterglow of carbon dots has recently attracted great interest. It is still challenging to fabricate a matrix-free and simultaneously long-lived afterglow material, especially a room-temperature phosphorescent (RTP) material, through a simple and effective way. Herein, we propose a simple and rapid one-step hydrothermal method for synthesizing matrix-free ultralong-lifetime room-temperature phosphorescent (URTP) boron and nitrogen co-doped CDs (B, N-CDs) using ethylenediaminetetraacetic acid disodium salt and boric acid. The as-prepared material exhibited blue fluorescence emission at 408 nm with excitation at 319 nm. Furthermore, B, N-CDs displayed URTP with a lifetime of 1.261 s. B and N elements promote the n–π* transition and intersystem crossing (ISC) and can effectively reduce the energy gap, and the formation of long-chain polymers based on the carbon core surface and the existence of hydrogen-bonded skeletons also play a crucial role in the generation of URTP. The facile preparation and unique optical features of these B, N-CDs make them promising candidates for information encryption and anticounterfeiting applications.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）