Fluorescence Aggregation-Caused Quenching versus Aggregation-Induced Emission: A Visual Teaching Technology for Undergraduate Chemistry Students

Ma, Xiaofeng; Sun, Rui; Cheng, Jinghui; Liu, Jiaoyan; Gou, Fei; Xiang, Haifeng; Zhou, Xiangge

doi:10.1021/acs.jchemed.5b00483

Cited by 292 publications

(185 citation statements)

References 23 publications

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“…Fluorescence quenching in the solid and aggregated states or at high concentration of the fluorophores, also known as aggregation caused quenching (ACQ), is a common phenomenon for organic luminescent materials . The ACQ effect is more harmful and challenging during practical applications in organic light emitting diodes (OLEDs), light‐emitting electrochemical cell applications and development of optoelectronic devices . However, fluorophores with solid state/aggregated emission have more advantages in above mentioned applications .…”

Section: Introductionmentioning

confidence: 99%

“…The ACQ effect is more harmful and challenging during practical applications in organic light emitting diodes (OLEDs), light‐emitting electrochemical cell applications and development of optoelectronic devices . However, fluorophores with solid state/aggregated emission have more advantages in above mentioned applications . Although a plenty of research articles and excellent organic fluorophores have been reported, most of the reported systems are highly emissive in the solution and weakly or non‐emissive in the solid state .…”

Section: Introductionmentioning

confidence: 99%

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AIE Active Carbazole-Benzothiazole Based ESIPT Motifs: Positional Isomers Directing the Optical and Electronic Properties

et al. 2017

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Three positional isomers based on carbazole (Cz) and hydroxy benzothiazole (HBT) were synthesized targeting solid state organic emitters by Suzuki coupling reaction and their optical, structural and electronic properties were compared. The changing of position of HBT unit on 9‐phenyl‐9H‐carbazole alters the optical and structural properties significantly. The synthesized compounds are highly emissive in solid and aggregated state (Φf=∼ 40 %) and weakly emissive in solvents of different polarities (Φf=2.6‐17 %). The difference in the fluorescence quantum efficiency among the positional isomers can be assigned to conformational differences which were further supported by geometrical parameters computed by DFT computations. The present Cz‐HBT based ESIPT motifs are endowed with aggregation induced emission (AIE), solid state and polarity sensitive emission with large Stokes shift.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

AIE Active Carbazole-Benzothiazole Based ESIPT Motifs: Positional Isomers Directing the Optical and Electronic Properties

et al. 2017

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“…We also investigated the aggregation effects on III in THF (good solvent) and deionized water (poor solvent) at different ratios (Figure S8, Supporting Information). The fluorescence intensity decreases as the water content increases, which is consistent with the aggregation‐caused quenching (ACQ) effect of the fluorescence …”

Section: Resultsmentioning

confidence: 99%

Enhanced Fluorescence Properties of Stilbene‐Containing Alternating Copolymers

Huang

Geng

Peng

et al. 2017

Macromol. Rapid Commun.

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In recent years, nonconjugated, fluorophore-free organic polymers have emerged as potentially useful light-emitting materials. The fluorescence properties of a novel class of nonconjugated, tert-butyl carboxylate functionalized stilbene-containing alternating copolymers are investigated in this work. These sterically crowded, semi-rigid copolymers exhibit very strong blue fluorescence in organic solvents upon irradiation. The origin of the fluorescent band with high quantum yield is attributed to the "through space" π-π interactions between the phenyl rings from the stilbene and CO groups from the anhydride groups. To the best of our knowledge, the di-tert-butyl group-containing stilbene and maleic anhydride alternating copolymer showed one of the highest fluorescent intensities among all fluorophore-free polymers. The excellent linearity of the luminescence property of this copolymer is an important attribute for future potential quantitative applications. The fluorescence is maintained when the tert-butyl groups are removed and the resulting carboxylic acid-functionalized copolymer is dissolved in water at neutral pH, which can render these copolymers as attractive candidates for diagnostic and therapeutic applications.

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“…Adding water to the THF solution of a molecule will cause the aggregates and result in an enhancement of the emission. This typical process is called the AIE effect …”

Section: Resultsmentioning

confidence: 99%

AIE Nanodots Obtained from a Pyrene Schiff Base and Their Applications

et al. 2017

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Developing the aggregation indcued emission (AIE) nanodots as alternates to the conventional inorganic quantum dots is a contemporary research interest towards assorted applications. Herein, we have designed and synthesized a tripodal structured pyrene Schiff base (PS) and it is characterized by 1H NMR, 13C NMR and ESI‐MS techniques. The developed PS exhibit an excellent AIE property in THF:water (10:90) ratio. The formed PS aggregates were meticulously characterized by HR‐SEM, HR‐TEM and AFM measurements. The results reveal that the PS aggregates are spherical in shape with an average diameter of ∼ 1 nm. Hence, the PS aggregates are expressed as AIE nanodots. Intriguingly, the AIE nanodots has high fluorescence lifetime (4 ns) and quantum yield of 54 %, which are adequate to compete with the commercial fluorophores. In addition, molecular structure dependent nano shapes have also been investigated. The PS based AIE nanodots were successfully utilized as a fluorescent probe for several applications such as in‐vitro bioimaging, detection of picric acid and photoinduced electron transfer studies. The confocal fluorescence images of nanodots in HeLa and HEK live cells exhibit higher fluorescence signal which clearly reveal that AIE nanodots can be used as a promising probe for in‐vitro bio‐imaging application. Moreover, the AIE nanodots are employed to detect the picric acid through fluorescence quenching method. Towards the commercial application, the low‐cost fluorescent test strips have also been developed for the detection of picric acid. We have also investigated the electron transfer nature of AIE nanodots with benzyl viologen towards the energy related applications.

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Fluorescence Aggregation-Caused Quenching versus Aggregation-Induced Emission: A Visual Teaching Technology for Undergraduate Chemistry Students

Cited by 292 publications

References 23 publications

AIE Active Carbazole-Benzothiazole Based ESIPT Motifs: Positional Isomers Directing the Optical and Electronic Properties

AIE Active Carbazole-Benzothiazole Based ESIPT Motifs: Positional Isomers Directing the Optical and Electronic Properties

Enhanced Fluorescence Properties of Stilbene‐Containing Alternating Copolymers

AIE Nanodots Obtained from a Pyrene Schiff Base and Their Applications

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