- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
New pyrene-based butterfly-shaped blue AIEgens: Synthesis, structure, aggregation-induced emission and their nondoped blue OLEDs
摘要： Developing the blue emitters with excellent electroluminescence (EL) performance is crucial for full-color displays and solid-state lighting. Based on the synthetic strategy for exploring highly efficient luminescent solids by constructing aggregation-induced emission (AIE) systems, two new pyrene-based butterfly-shaped blue AIEgens, Py(5,9)BTPE and Py(5,9)BTriPE, have been successfully designed and synthesized by integrating two tetraphenylethylene (TPE) or triphenylethylene (TriPE) groups into pyrene ring. The adoption of the pyrene unit with a large optical bandgap, the use of the TPE or TriPE group with AIE characteristic, the integration of the TPE or TriPE group into pyrene ring at 5,9-positions, and the highly twisted molecular conformations of present AIE systems endow the two compounds with bright blue emission in the solid state. These foregoing features ensure that the new pyrene-based compounds can serve as excellent blue-emitting materials in OLEDs. A non-doped OLED based on Py(5,9)BTPE exhibited a sky-blue emission (Von: 3.2 V) with a CIE coordinates of (0.19, 0.28), a maximum external quantum efficiency (EQEmax) of 3.35%, a current efficiency (CE) of 6.51 cd A-1 with a low efficiency roll-off that represents one of the highest value reported for sky-blue AIE-based OLEDs. An analogous device with Py(5,9)BTriPE as an emitting layer displayed a pure-blue emission (CIE: 0.16, 0.17) with a moderate EQEmax of 1.27% and a CE of 1.63 cd A-1 with a low efficiency roll-off. Furthermore, the EL emissions of the two devices display almost no change with the increasing of the current density, indicating their good color stability.
关键词： nondoped OLED,blue AIEgens,aggregation-induced emission (AIE),phenylethylene,pyrene
更新于2025-09-11 14:15:04
-
An AIEgen-based luminescent photo-responsive system used as concealed anti-counterfeit material
摘要： Photo-responsive materials with good luminescence performance in solid state have received widespread attention. However, the reported luminescent photo-responsive systems exhibit either only color change or both color and luminescence changes in solid state upon UV light irradiation. Developing photo-responsive materials with only tunable luminescence signals in solid state remains a great challenge for constructing concealed anti-counterfeit materials. In this work, a novel luminescent photo-responsive molecule (TPE-TS) was developed, which exhibited intense ?uorescence emission due to the aggregation-induced emission (AIE) characteristic from its tetraphenylethene moiety. After irradiated by UV light, an isomerization from thio-keto form to thio-enol form took place in the thiosemicarbazide group, accompanied with obvious ?uorescence quenching. Interestingly, there was no visible color variation before and after UV light irradiation owing to the small conjugated structure of TPE-TS. Taking this unique photo-responsive property, a concealed anti-counterfeit paper was successfully prepared. Letters could be recorded by UV light on this paper, hided under daylight and only visible again by UV light, demonstrating an excellent concealed performance as an anti-counterfeit material.
关键词： Anti-counterfeit,Luminescence,Photo-responsive,Aggregation-induced emission
更新于2025-09-11 14:15:04
-
An ultrafast molecular rotor based fluorescent turn-on sensor for perrhenate anion in aqueous solution
摘要： Devising sensors for perrhenate anion in aqueous media is extremely challenging, and is seldom reported in literature. Herein, we report a fluorescence turn-on sensor for perrhenate anion in aqueous medium based on the aggregation induced emission of a popular ultrafast molecular rotor dye, Thioflavin-T. The selective response towards perrhenate anion has been rationalized in terms of matching water affinity, where the weakly hydrated perrhenate anion spontaneously forms a contact ion-pair with the weakly hydrated ultrafast molecule rotor based organic cation, Thioflavin-T, which in turn leads to an aggregate assembly that provides a fluorescence turn-on response towards perrhenate. The sensing response of Thioflavin-T is found to be quite selective towards perrhenate anion, when tested against the anions which are ubiquitously present in the environment such as chloride, nitrate, sulphate etc. The formation of self-assembled Thioflavin-T aggregates has been also investigated by time-resolved emission and temperature dependent measurements.
关键词： Aggregation induced emission,Turn-on sensor,Fluorescence sensor,Thioflavin-T,Perrhenate anion
更新于2025-09-10 09:29:36
-
A simple turn-on fluorescent chemosensor for CO2 based on aggregation-induced emission: Application as a CO2 absorbent screening method
摘要： An a-cyanostilbene-based fluorescent chemosensor, which includes a primary amine, was developed for the quantitative analysis of CO2 in solution. (Z)-3-(4-(3-Aminopropoxy)phenyl)-2-(4-nitrophenyl)acrylonitrile (1) reacts with CO2 and enables a turn-on type CO2 chemosensor with increased fluorescence due to aggregation-induced emission. More importantly, 1 required no additives such as an amine media for detecting CO2, and the limit of detection was estimated to be ~26 ppm. This system was successfully applied to determine the relative efficiency of CO2 absorbents dependent on the fluorescence change in 1. The use of this chemosensor as a CO2 absorbent screening method suggests that 1 may be used to develop a high-throughput screening method for the evaluation of high-performance CO2 absorbents.
关键词： High throughput screening,Aggregation-induced emission,CO2 absorbent screening,Fluorescent chemosensor,CO2
更新于2025-09-10 09:29:36
-
Highly Fluorescent Liquid Crystals from Excited-State Intramolecular Proton Transfer Molecules
摘要： Fluorescence via excited-state intramolecular proton transfer (ESIPT) provides strong light emission with a large Stokes shift and environment-sensitive unique spectral patterns. Particular systems including 2-(2-hydroxyphenyl) benzothiazole (HBT) serve as efficient solid-state emitters with the ESIPT mechanism and aggregation-induced emission enhancement (AIEE) property, but have not been used for liquid crystalline (LC) materials. Here, rod-shaped fluorescent LCs with ESIPT characters are newly developed based on the HBT motif. The design of the targeted molecules is in line with a simple design principle: a molecule with an alkyl tail, rigid ring, and active HBT core. The LC C6Ph-HBT is highly luminescent in the solid state with an absolute fluorescence quantum yield (ΦFL) up to 0.39 and exhibits anisotropic fluorescence in its nematic LC phase. C6Ph-HBT is miscible up to 6 wt% with a conventional room-temperature (r.t.) nematic LC 4-cyano-4′-pentylbiphenyl (5CB), allowing homogeneous fluorescent r.t. LCs. The LC mixture 5CB/C6Ph-HBT shows ΦFL of 0.26 even in the nonaggregated state, and responds to an electric field with dynamic modulation of not only the optical transparency but also polarized fluorescence. The interplay of highly efficient fluorescence from ESIPT cores and their visible transparency is encouraging for future optical applications of the present molecular systems.
关键词： fluorescence,excited-state intramolecular proton transfer,calamitic mesogens,aggregation-induced emission,liquid crystals
更新于2025-09-10 09:29:36
-
Silver doping induced luminescence enhancement and red shift of gold nanoclusters with aggregation-induced emission
摘要： Deep understanding on the luminescence property of aggregation-induced emission (AIE) featured metal nanoclusters (NCs) is highly desired. This paper reports an systematic study on enhancing the luminescence of AIE-featured Au NCs, which is achieved by Ag doping to engineer the size/structure and aggregation states of the Au(I)-thiolate motifs in the NC shell. Moreover, by prolonging reaction time, the luminescence of the as-synthesized AuAg NCs could be further tailored from orange to red, which is also due to the variation of the Au(I)-thiolate motifs of NCs. This study can facilitate the better understanding of this AIE-featured luminescent probe and the design of other synthetic routes for this rising family of functional materials.
关键词： bimetallic,aggregation-induced emission,luminescence enhancement,nanoclusters,red shift
更新于2025-09-10 09:29:36
-
Effect of substituents on photophysical and aggregation behaviour in quinoline based bis-terpyridine Zn(II) complexes
摘要： Synthesis of the terpyridine based novel Zn(II) complexes (C1-C3) have been described. Characterization of these complexes has been achieved by spectroscopic studies (IR, 1H, 13C, 19F, HRMS, UV/Vis and fluorescence) and structure of C1 determined by X-ray single crystal analyses. Cautious tuning by incorporating appropriate substituents (–H; C1, –CH3; C2 and –OCH3; C3) enabled the complexes to exhibit solvent dependent emission indicative of more polarized excited state probably due to enhanced intramolecular charge transfer (ICT). Occurrence of aggregation induced emission (AIE) in C3 has been validated by solid state emission and vital role of RIR in inducing AIE upon aggregation by fluorescence lifetime experiments. The role of solvent and substituents on photophysical behaviour and morphology of the complexes has been investigated by UV/Vis, emission and scanning electron microscopy (SEM). As well, lowering of the energy gap between HOMO and LUMO by electron donating substituents –CH3 (C2) and –OCH3 (C3) has been supported by DFT studies.
关键词： Zn(II) complexes,photophysical properties,DFT studies,aggregation induced emission,terpyridine
更新于2025-09-10 09:29:36
-
Aggregation-induced emission (AIE) fluorophores as imaging tools to trace the biological fate of nano-based drug delivery systems
摘要： The vigorous development of nanotechnology has been accompanied by an equally strong interest and research efforts in nano-based drug delivery systems (NDDSs). However, only a few NDDSs have been translated into clinic thus far. One of the important hurdles is the lack of tools to comprehensively and directly trace the biological fate of NDDSs. Recently, aggregation-induced emission (AIE) fluorophores have emerged as attractive bioimaging tools due to flexible controllability, negligible toxicity and superior photostability. Herein, we recapitulate the current advances in the application of AIE fluorophores to monitor NDDSs both in vitro and in vivo. Particularly, we discuss the cellular fates of self- indicating and stimuli-responsive NDDSs with AIE fluorophores. Moreover, we highlight the in vivo application of AIE agents on the long-term tracking of therapeutics and the multi- modal monitoring of diagnostics in NDDSs. Challenges and opportunities in AIE-guided exploration of NDDSs are also discussed in detail.
关键词： aggregation-induced emission,bioimaging tools,nano-based drug delivery system,in vitro and in vivo
更新于2025-09-10 09:29:36
-
AIE-active luminogen for highly sensitive and selective detection of picric acid in water samples: Pyridyl as an effective recognition group
摘要： Detection of nitroaromatic explosives especially picric acid (PA) is considerably worth concern on human safety and homeland security. Herein, we developed an effective probe (APPTPEP) for PA detection in aqueous medium by combination of 1,4-dihydropyrrolo[3,2-b]pyrrole with tetraphenylethylene and pyridine units. The incorporation of tetraphenylethylene unit in the backbone endows the APPTPEP a significant aggregation induced emission (AIE) behavior. Pyridyl group was proved as recognition site for PA and their strong interaction was confirmed by 1H NMR titration and supported by theoretical calculation. Owing to this strong affinity, APPTPEP exhibited high selectivity and sensitivity (limit of detection 31.5 nM) to PA over other nitroaromatic compounds. This research provides new insights into the rational design of AIE-active materials for effective sensing application.
关键词： 1,4-dihydropyrrolo[3,2-b]pyrrole,Picric acid,Aggregation-induced emission,Pyridyl group
更新于2025-09-10 09:29:36
-
Synthesis of luminescent gold nanoclusters embedded goose feathers for facile preparation of Au(I) complexes with aggregation-induced emission
摘要： A new kind of luminescent hybrid materials based on ultra-small nanomaterials, i.e., gold nanoclusters (AuNCs) and goose feathers, precious gifts from nature, has been successfully synthesized. Goose feathers possess high specific surface area due to their hierarchical structure and are mainly composed of thiol-rich proteins, e.g., keratin, which can reduce Au(III) and encapsulate the formed AuNCs in a large scale. The resultant golden feathers exhibit bright red luminescence under UV light, of which the substructures, i.e., barbs and barbules, have been sufficiently stained with red-emitting AuNCs. Furthermore, the AuNC-stained feathers maintain almost unchanged structure (solid and hierarchical) and intact chemical composition. The features of such AuNC/feather hybrids, e.g., bulk, high specific surface, inspired us to develop a facile method to prepare various valuable debris from AuNC-based etching, i.e., Au(I) complexes with aggregation-induced emission (AIE). We selected tris(2-carboxyethyl)phosphine and cysteamine as etchants, respectively, which have been previously reported to be able to synthesize AIE-featured Au(I) complexes through etching AuNCs protected by soluble protein. Conveniently, in this approach, the protein-free Au(I) complexes in solution can be attained simply by taking out with bare hand. After adding cation aggregation inducer, e.g., Cd2+, the non-emitting solution can generate bright luminescence, demonstrating the feasibility to synthesize the precious AIE-type Au(I) complexes. This study not only boosts the development of luminescent gold materials through rational use of natural product, enriching the library of gold nanomaterials, but also definitely provides a new view of nanoclusters as reagents to prepare other noble materials.
关键词： Aggregation induced emission,Gold nanoclusters,Chemical etching,Gold(I) complexes,Goose feathers
更新于2025-09-10 09:29:36