Fluorescence and fluorescent dyes

Langhals, Heinz

doi:10.1515/psr-2019-0100

Cited by 8 publications

(7 citation statements)

References 108 publications

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“…Organic dyes [33] possessing planar, rigid aromatic rings with conjugated structures can be divided into several types, including boron-dipyrromethene (BODIPY), [34,35] rhodamine derivatives, [36,37] coumarins [38] and fluorescein, [39] according to the differences in their chemical structures. Organic dyes can be introduced into gel systems through physical doping or chemical bonding.…”

Section: Chemical Color Based On Organic Dyesmentioning

confidence: 99%

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Sun

Zhou³

et al. 2022

Advanced Materials

197

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decryption processes. Furthermore, these traditional anti-counterfeiting strategies are easily duplicated and are unable to counter the growing number of forgery techniques because they are widely recognized. Therefore, there is an urgent need to develop new anti-counterfeiting materials and innovative encryption/decryption approaches to endow stored information with higher security.In recent decades, polymeric gels have been developed as novel materials with programmable 3D network structures that are adaptable and inclusive, showing great potential for applications in various fields such as soft robotics, tissue engineering and information storage. [12][13][14][15][16][17][18][19] Among these, smart gels that exhibit shape morphing or color changes when exposed to external stimuli (e.g., light, heat, electricity, magnetism, mechanical force, or chemicals) have gained much attention. [20][21][22][23] Owing to its unique stimulus-responsiveness, a smart polymeric gel has been proven to be an excellent candidate for information encryption/decryption, exhibiting dynamic information output and a much higher security level. In general, an anti-counterfeiting process consists of three steps: coding, encryption, and decryption. For smart gel-based information storage devices, the external stimulus is the key to the decryption, and the tunable optical properties of the gel are utilized for coding. In other words, the information loaded on the gel is invisible or fake under normal circumstances, and the recipient can obtain the desired message only when the encrypted message is exposed to a particular external stimulus.Although polymeric gel-based information storage devices (PGISDs) are still in their infancy, there has been strong worldwide interest in this field. However, no related review has provided an in-depth overview of gel-based information storage for anti-counterfeiting. This review provides a tutorial overview that summarizes the recent progress in PGISDs, focusing on the preparation methods for gels with adjustable optical properties, their encryption/decryption mechanisms, and how to improve the security level using their dimensions and colors. As depicted in Figure 1, anti-counterfeiting materials based on elaborate gel systems show excellent encryption/decryption behaviors by adjusting either their chemical colors in the presence or absence of UV irradiation or physical colors under visible light (absorption/transmittance, refraction/scattering, and interference/diffraction). Endowing gels that display polychromic colors with stored information can achieve multilevel Information security protection has a tremendous impact on human life, social stability and national security, leading to the rapid development of anti-counterfeiting materials and related techniques. However, the traditional stored information on hard or dry media is often static and lacks functions, which makes it challenging to deal with increasing and powerful counterfeiting technologies. Modified intelligent polymeric gels exhibit color...

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Section: Chemical Color Based On Organic Dyesmentioning

confidence: 99%

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Sun

Zhou³

et al. 2022

Advanced Materials

197

View full text Add to dashboard Cite

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“…All spectra are presented in TDM representation. , The relatively good absorption–emission mirror image symmetry for both D and A confirms the vibronic origin of the spectral progressions. Small deviations in spacing and relative peak magnitudes between absorption and emission spectra can be explained by slight anharmonicities of vibrational potentials. ,− The absorption spectrum of D–A, shown as the light-blue line in Figure c, corresponds almost exactly to the sum of the uncoupled molecules D and A, requiring only a minor red-shift of ∼50 cm –1 of A in order to achieve essentially perfect agreement. The small spectral shift demonstrates that the D–A electronic coupling is weak, suggesting that the assumptions underlying Förster theory for excitation transport are satisfied.…”

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confidence: 99%

Isolating Pure Donor and Acceptor Signals by Polarization-Controlled Transient Absorption Spectroscopy

Mewes

Thyrhaug

et al. 2023

J. Phys. Chem. Lett.

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The optical spectra of molecules are often highly congested, inhibiting definite assignment of features and dynamics. In this work, we demonstrate and apply a polarization-based strategy for the decomposition of time-resolved optical spectra to analyze the electronic structure and energy transfer in a molecular donor–acceptor (D–A) dyad. We choose a dyad with orthogonal transition dipole moments for D and A and high fluorescence quantum yield to show that polarization-controlled ultrafast transient absorption spectra can isolate the pure D and A parts of the total signal. This provides a strategy to greatly reduce spectral congestion in complex systems and thus allows for detailed studies of electronic structure and electronic energy transfer.

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“…for aggregation. [17] The iodine atoms in 6 and 7 for linking were not attached to simple phenyl groups because of preventing a competting of FRET by electron transfer [11b] from the comparably electron-rich linkers in the the target comopunds; pyridine groups instead cause a sufficient electron depletion because of the electronegative nitrogen atoms.…”

Section: Resultsmentioning

confidence: 99%

FRET in Orthogonal, Increasingly Strain‐Rigidified Systems

Langhals

Dietl

Mayer

2021

Israel Journal of Chemistry

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The influence of the geometry factor κ on the efficiency of energy transfer by FRET (Förster resonance energy transfer) was studied by means of dyads of benzoperylene and perylene interlinked by a spacer of the cage bicyclo‐[2.2.2]octane. The electronic transition moments were arranged orthogonally for extinguishing the energy transfer according to Förster's theory. In contrast to the theory energy transfer proceeded unrestrictedly attributed to molecular vibrations. A further rigidifying of the spacer by means of annellation with benzo groups until the very rigid triptycene as a spacer could not hinder the energy transfer so that general strongly coupled molecular framework vibrations seem to be dominant in the energy transfer whereas molecular flexibility seems to be of minor importance. Application such as molecular mirrors are discussed.

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Fluorescence and fluorescent dyes

Cited by 8 publications

References 108 publications

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Isolating Pure Donor and Acceptor Signals by Polarization-Controlled Transient Absorption Spectroscopy

FRET in Orthogonal, Increasingly Strain‐Rigidified Systems

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