Nanomaterials
·
2020
·Vol. 10
·期 3
·464
·
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
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2022
·
IF 1.097
Ruiji Li,Dong Wang,Xiaoyun Li,Zehui Zhang,Wei Li
Visible-light-excited fluorescent probes with excellent water solubility are of significant research importance in the biomedical field. In this work, a series of visible-light-responsive carbocyanine fluorescent compounds [DiSCn(3)] are synthesized from 2-methylbenzothiazole and are employed as fluorescent probes for detecting tin(II) ions. Upon addition of tin(II) ions to an aqueous solution of compounds DiSCn(3)-3 and 4, both exhibit considerable changes in their absorption and fluorescent intensity, respectively. These spectral changes may correspond to the binding between tin(II) ions and the sulfur atom in the benzothiazole unit to form a metal complex. This indicates that DiSCn(3)-3 and 4 can be used as promising fluorescent chemical sensors for detecting tin(II) ions in aqueous solution via visible-light excitation.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 31
·2207046
·
IF 13.3
Dong Lu,Ke Lu,Hong-Tao Wen,Zhan Wei,Alberto Bianco,Gui-Gen Wang,Hua-Yu Zhang
The preparation of room temperature phosphorescent carbon dots still faces great challenges, especially in the case of carbon dots endowed of visible-light excitable room temperature phosphorescence (RTP). To date, a limited number of substrates have been exploited to synthesize room temperature phosphorescent carbon dots, and most of them can emit RTP only in solid state. Here, the synthesis of a composite obtained from the calcination of green carbon dots (g-CDs) blended with aluminum hydroxide (Al(OH) 3 ) is reported. The resultant hybrid material g-CDs@Al 2 O 3 exhibits blue fluorescence and green RTP emissions in an on/off switch process at 365 nm. Notably, this composite manifests strong resistance to extreme acid and basic conditions up to 30 days of treatment. The dense structure of Al 2 O 3 formed by calcination contributes to the phosphorescent emission of g-CDs. Surprisingly, g-CDs@Al 2 O 3 can also emit yellow RTP under irradiation with white light. The multicolor emissions can be employed for anti-counterfeiting and information encryption. This work provides a straightforward approach to produce room temperature phosphorescent carbon dots for a wide range of applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2014
·
IF 5.825
Qiaoling Liu,Huizhi Du,Xiaoze Ren,Wei Bian,Li Fan,Shaomin Shuang,Chuan Dong,Qin Hu,Martin M. F. Choi
An organic salt as a fluorescent probe based on intramolecular charge transfer for Ca2+ determination is developed. Ca2+ can be detected by ratiometric emission at 490 and 594 nm with an excitation wavelength of 405 nm. This probe is highly selective for Ca2+ over other divalent metal cations and displays a large Stokes shift of 189 nm that can avoid interference of the excitation light beam and autofluorescence of biological samples. The dissociation constant for Ca2+ is 2.25 ± 0.47 μM and pertinent to Ca2+ detection in cellular resting and dynamic states. The probe demonstrates its application in monitoring Ca2+ in living cells under confocal microscopic imaging.
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Advances
·
2023
·
IF 10
Huiyong Wang,Bowen Shi,Hongmei Yu,Shu Yang,Guochao Nie,Shaoyan Wang,Wei Chen
Carbon dots-based phosphorescent composites have excellent room-temperature phosphorescent properties. However, the development of carbon dots-based phosphorescent materials that are excited by visible light and have adjustable colors remains a challenge. Here, we report on phosphorescent composites based on multicolored fluorescent carbon dots (CDs) and polyacrylamide (PAM) with four phosphorescent colors (blue, green, yellow and red). The phosphorescence of CDs@PAM composites is mainly derived from the C=O bonds of CDs. Electron transition of n-π* in the C=O bonds facilitates the intersystem crossover that are necessary to generate phosphorescence. In addition, the hydrogen bond actions between the amide groups of PAM polymer and the functional groups on CDs surface also promote the intersystem crossover and inhibit the non-radiative relaxation of triple states (T 1 ) in CDs@PAM. Meanwhile, the PAM matrix provides a rigid protective environment (hydrogen bond mesh structure) that inhibits vibrations, rotations and collisions of the CDs' luminescent clusters (C=O), avoiding the rapid decay of phosphorescence. Four kinds of CDs based phosphorescence materials can produce brilliant phosphorescence under the excitation of visible light (flashlight). Finally, their colorful phosphorescent colors were used to achieve a naked-eye observable anti-counterfeit pattern, demonstrating the potential application of these materials.
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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Min Cai,Zhaoshuang Li,Rongkang Chen,Yin He,Xu Xu,Xu-Min Cai,Wei Yuanfeng,Zhenfei Yang,Chuntao Kuang,Guoen Yang,Yan Qing,Xingong Li,Yiqiang Wu
Room-temperature phosphorescent (RTP) materials based on carbon dots (CDs) have received much attention due to their potential applications in anti-counterfeiting in recent years. However, it remains a considerable challenge to prepare CDs-based RTP materials with sunlight excitation and excellent stability. This work provides a straightforward method for one-step calcination of rosin-based carbon quantum dots (R-CDs) with aluminum hydroxide (Al(OH) 3 ) to create ecologically sustainable room-temperature phosphorescent materials (CDs@Al 2 O 3 ). CDs@Al 2 O 3 exhibit excitation dependence, emitting green phosphorescence under 365 nm excitation, yellow phosphorescence under visible light excitation, and blue-green phosphorescence under sunlight excitation. Surprisingly, CDs@Al 2 O 3 display time-dependent afterglow, switching from blue to green phosphorescence when excited at 285 nm. Furthermore, after being submerged in polar and acid-base solutions for 21 days, the phosphorescence of CDs@Al 2 O 3 is still visible to the unaided eye. At last, CDs@Al 2 O 3 composites are utilized in applications including smart flashing traffic signals, multi-level information, and anti-counterfeiting. This work expands creative application opportunities by offering a straightforward and adaptable approach to generating ecologically friendly RTP materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 7
·1901557
·
IF 8.286
Yifang Gao,Huilin Zhang,Shaomin Shuang,Chuan Dong
Visible light is ubiquitous and safer than ultraviolet light; however, synthesizing ultralong-lifetime room temperature phosphorescent (URTP) carbon dots (CDs) with visible-light excitation remains a formidable challenge. Herein, an easy and fast method for synthesizing visible-light-excited URTP CDs is devised. The synthesized CDs have URTP lifetime of 1.51 s which is a relatively long life RTP lifetime ever reported. Furthermore, it is revealed that the dense core of CDs, the formation of long-chain polymers on the surface, and the presence of hydrogen bond skeleton play a crucial role in the production of URTP. Also, the introduction of the N element is a critical factor in the URTP synthesis as it promotes the n–π* transition and facilitates intersystem crossing (ISC) such that the triplet state is filled with effective excitons. Notably, the CDs demonstrate URTP properties under the excitation of 365 UV light and exhibit URTP under the excitation of visible light. This is a rare report of visible-light-excited URTP based on CDs. Considering this excellent property, URTP CDs may be applied in the field of anticounterfeiting. These findings may broaden the path for the development of visible-light-excited URTP materials and their applications.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 3
·1324-1332
·
IF 2.371
Jia Lei,Zhou Tao,Xu Jun,Xu Zhouqing,Zhang Mingming,Wang Yuan,Li Zhongyue,Zhu Taofeng
Lanthanide complexes have attracted increased attention in recent years for their unique photophysical properties such as large Stokes shifts, narrow bandwidth, long radiative lifetimes, and high luminescence quantum yield. However, low photochemical stability and poor mechanical properties limit the technological applicability of lanthanide complexes. Two natural clay minerals, fibrillar palygorskite (Pal) and tubular halloysite nanotubes (HNTs), are known for their extreme stabilities and high surface area and show promise as new carriers of luminescent lanthanide complexes for further applications. In this report, clay-based lanthanide polymer nanocomposites clay–polyethyleneimine (PEI)–MPTP–Eu(DBM) 3 have been fabricated by attaching a lanthanide complex onto the surface of PEI-modified Pal or HNTs. The formed nanocomposites display visible light-excitable features with a wide excitation wavelength range from UV to visible light, a long luminescence lifetime, and improved photoluminescence stability. Their excellent luminescence, high suspension stability, and low cytotoxicity in cell studies result in the potential applications of the as-prepared nanocomposites for cell imaging in biological systems.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2013
·
IF 3.498
Lin Zhang,Lu Tian,Zhiqiang Ye,Bo Song,Jingli Yuan
By using a visible-light-excited ternary Eu 3+ complex, BHHBCB-Eu 3+ -BPT (BHHBCB: 1,2-bis[4′-(1“,1“,1“,2“,2“,3“,3“-heptafluoro-4″,6″-hexanedion-6″-yl)-benzyl]-4-chlorosulfobenzene; BPT: 2-( N , N -diethylanilin-4-yl)-4,6-bis(pyrazol-1-yl)-1,3,5-triazine), as a luminophore, two kinds of novel visible-light-excited europium materials, the silica-encapsulated BHHBCB-Eu 3+ -BPT (Eu@SiO 2 ) nanoparticles and BHHBCB-Eu 3+ -BPT-conjugated bovine serum albumin (BSA–BHHBCB-Eu 3+ -BPT), were prepared for biolabeling and time-resolved luminescence cell imaging applications. The Eu@SiO 2 nanoparticles, prepared by the copolymerization of 3-aminopropyl(triethoxy)silane–BHHBCB-Eu 3+ -BPT conjugate, free 3-aminopropyl(triethoxy) silane and tetraethyl orthosilicate in a water-in-oil reverse microemulsion , are monodispersed, spherical and uniform in size, and strongly luminescent with an excitation peak at ∼400 nm and a long luminescence lifetime of 346 μs. The BSA–BHHBCB-Eu 3+ -BPT, prepared by covalent binding of BHHBCB-Eu 3+ -BPT to BSA, shows also strong visible-light-excited luminescence with a excitation peak at ∼400 nm and a long luminescence lifetime of 402 μs. The two materials were used for labeling transferrin and folic acid . Using the time-resolved luminescence imaging of living HeLa cells, the cell-surface receptors of transferrin and folic acid were successfully visualized by the prepared biolabels based on the ligand–receptor affinity binding interaction. The results demonstrated the feasibility of the new materials as visible-light-excited biolabels for the time-resolved luminescence cell imaging.
研究领域:
生物化学
·
材料科学
·
医学影像
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 54
·28481-28489
·
IF 3.708
Lining Sun,Zhijuan Wang,Jin Z. Zhang,Jing Feng,Jinliang Liu,Yin Zhao,Liyi Shi
A new type of monodisperse mesoporous titania microspheres possessing visible (Eu3+, Sm3+) and near-infrared (Sm3+, Yb3+, Nd3+) luminescence were synthesized with covalent linking to Ln(dbm)3bpdc complexes (Ln = Eu, Sm, Yb, Nd, dbm = dibenzoylmethanate, bpdc = 2,2′-bipyridine-4,4′-dicarboxylic acid). These lanthanide complex-functionalized titania microspheres can be excited with visible light to extend the practical application in lighting devices and biomedical analysis. The materials were characterized using Fourier-transform infrared (FT-IR) spectroscopy, wide-angle X-ray powder diffraction (WAXD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), nitrogen adsorption/desorption, diffuse reflectance (DR) spectroscopy, fluorescence spectroscopy, and thermogravimetric analysis. The results show that the microsphere morphology composed of single anatase crystallites and mesoporous structure is retained after linking to the lanthanide complexes. To the best of our knowledge, this is the first successful attempt to graft lanthanide complexes onto mesoporous anatase titania microspheres with high crystallinity. The novel combination of lanthanide complexes with NIR luminescence under visible light excitation and mesoporous titania microspheres with high thermal and chemical stabilities as well as anatase crystallinity affords potential applications in the fields of energy conversion, photocatalysis, and biomaterials.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Lining Sun,Yannan Qiu,Tao Liu,Jin Z. Zhang,Song Dang,Jing Feng,Zhijuan Wang,Hongjie Zhang,Liyi Shi
A series of ternary lanthanide β-diketonate derivatives covalently bonded to xerogels (named as Ln-DP-xerogel, Ln = Sm, Yb, Nd, Er, Pr, Ho) by doubly functionalized alkoxysilane (dbm-Si) was synthesized in situ via a sol-gel process. The properties of these xerogel materials were investigated by Fourier-transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (FE-SEM), diffuse reflectance (DR) spectroscopy, thermogravimetric analyses, and fluorescence spectroscopy. The data and analyses suggest that the lanthanide derivatives have been covalently grafted to the corresponding xerogels successfully. Of importance here is that, after excitation with visible light (400–410 nm), the xerogels all show characteristic visible (Sm3+) as well as near-infrared (NIR; Sm3+, Yb3+, Nd3+, Er3+, Pr3+, Ho3+) luminescence of the corresponding Ln3+ ions, which is attributed to the energy transfer from the ligands to the Ln3+ ions via an antenna effect. Exciting with visible light is advantageous over UV excitation. Furthermore, to the best of our knowledge, it is the first observation of NIR luminescence with visible light excitation from xerogels covalently bonded with the Sm3+, Pr3+, and Ho3+ derivatives. Compared to lanthanide complexes (Ln = Er, Nd, Yb) functionalized periodic mesoporous organosilica (PMO) materials that exhibit similar optical properties reported in our previous work, the Ln-DP-xerogel (Ln = Sm, Yb, Nd, Er, Pr, Ho) in this case offer advantages in terms of ease of synthesis and handling and potentially low cost for emerging technological applications. Development of near-infrared luminescence of the lanthanide materials with visible light excitation is of strong interest to emerging applications such as chemosensors, laser systems, and optical amplifiers.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2015
·
IF 3.966
Jintai Lin,Xuan Xu,Wohua Zhou,Liudan Yu,Qianming Wang
Reaction of quinolone type antibiotics (enrofloxacin, ciprofloxacin, norfloxacin and ofloxacin) with lanthanide ions (Eu 3+ and Tb 3+ ) afforded eight kinds of complexes that can be dissolved in water. These compounds possess not only the advantages of long excited state lifetimes, but also allow excitation in the visible light range depending on the concentration variation. Especially the excitation wavelength of the terbium complexes can be extended into 405 nm. Theoretical studies demonstrated that the calculated energy gaps between HOMO and LUMO+1 orbital could be reduced and a dimeric structure was formed during the concentration experiments. Moreover, uniform and long rod-like structures (diameter: 100 nm; length: 10 μm) were achieved and concentration dependence has been investigated. The strategy of combining lanthanide characteristic emission nature and longer wavelength excitations can be applicable to the development of luminescent devices with controllable shapes.
研究领域:
化学
·
材料科学
·
药学
✓ 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）