Fluorescence Quantum Yields of Laser Dyes Determined by On-Line Computer Evaluation

Gauglitz, Günter; Lorch, A. E.; Oelkrug, D.

doi:10.1515/zna-1982-0303

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…A Spex fluorolog with a CCD detector was used to determine the photoluminescence intensity spectrum of both films on glass and of (−)PPP solutions in cuvettes. The quantum yield of (−)PPP was estimated on the basis of a comparison of the normalized solution photoluminescence of (−)PPP with dilute solutions of stilbene 420 (aka stilbene 3) and coumarin 440 (aka coumarin 120) which have reported theoretical quantum yields in methanol of 71 and 72%, respectively . Both of these laser dyes absorb and fluoresce in the same spectral region as (−)PPP.…”

Section: Methodsmentioning

confidence: 99%

Förster Energy Transfer Studies of Polyelectrolyte Heterostructures Containing Conjugated Polymers: A Means To Estimate Layer Interpenetration

et al. 1999

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Using a sequential adsorption process, thin film multilayer assemblies of polymers which photophysically interact via the Förster energy transfer mechanism have been fabricated and characterized in order to determine the level of interpenetration between layers. The assemblies consisted of layers of poly(phenylene vinylene) (PPV) which were separated from layers of a sulfonatopropoxy anion derivatized poly(p-phenylene) [(-)PPP] by nonconjugated polyelectrolyte spacer bilayers. The spacer bilayers were composed of poly(allylamine hydrochloride) (PAH) with a polyanion of either poly(acrylic acid) (PAA), poly(methacrylic acid) (PMA), or poly(styrenesulfonate) (PSS). An estimate of the level of interpenetration of the layers was made for each type of spacer bilayer by correlating the relative amount of quenching of the (-)PPP photoluminescence with the measured total thickness of the spacer bilayer(s) utilizing a diffuse layer model which assumed a Gaussian distribution of polymer segments. Using this approach, the level of interpenetration for the assemblies with the PMA/PAH spacer bilayers was estimated to be between 15 and 53 Å (1-2.5 bilayers). The heterostructure assembly which used spacer bilayers of PAA/PAH demonstrated that one sufficiently thick bilayer (g57 Å) could prevent the energy transfer from the (-)PPP to the PPV. The failure of the (-)PPP photoluminescence to be fully restored even with eight spacer bilayers (>53 Å) for the assemblies containing PSS/PAH spacer bilayers indicated that, for the processing conditions used, significant layer mixing was obtained. Overall, this work demonstrated that nonradiative energy transfer offers a valuable tool for probing the internal structure of sequentially adsorbed polyelectrolyte films and that the level of interpenetration appears to be dependent upon the system being examined.

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Section: Methodsmentioning

confidence: 99%

Förster Energy Transfer Studies of Polyelectrolyte Heterostructures Containing Conjugated Polymers: A Means To Estimate Layer Interpenetration

et al. 1999

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“…Fluorescence quantum yields Φ Fl were recorded in toluene as well as PhCN and versus Coumarin 2 (Φ Fl =0.77 [22] ) and Rhodamin B in EtOH (Φ Fl =0.7 [23] ) as references for NDIs and PDIs, respectively (Table 1).…”

Section: Resultsmentioning

confidence: 99%

A Functional Hexaphenylbenzene Library Comprising of One, Three, and Six Peripheral Rylene‐Diimide Substituents

Dusold

Platzer

Haines

et al. 2020

Chemistry A European J

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Synthesis and characterization of a series of rylene‐diimide substituted hexaphenylbenzenes (HPBs) is presented. The direct connection of the rylene‐diimide units to the HPBs via the imide‐N‐position without any linkers as well as the use of naphthalene‐diimides (NDIs) next to perylene‐diimides (PDIs) is unprecedented. While mono‐substituted products were obtained by imidization reactions with amino‐HPB and the respective rylene‐monoimides, key step for the formation of tri‐ and hexa‐substituted HPBs is the Co‐catalysed cyclotrimerization. Particular emphasis for physic‐chemical characterization was on to the number of NDIs/PDIs per HPB and the overall substitution patterns. Lastly, Scholl oxidation conditions were applied to all HPB systems to generate the corresponding hexa‐peri‐hexabenzocoronenes (HBCs). Importantly, the efficiency of the transformation strongly depends on the number of NDIs/PDIs. While three rylene‐diimide units already hinder the Scholl reaction, the successful synthesis of mono‐substituted HBCs is possible.

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Optische Aufheller als Laserfarbstoffe

Rinke

Güsten

1986

Ber Bunsenges Phys Chem

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The singlet absorption, triplet absorption and the absolute fluorescence spectra together with the fluorescence quantum yields and fluorescence decay times as well as the laser performance (tuning range, conversion efficiency, photochemical stability) of nine fluorescent brightening agents have been measured in ethanol at room temperature. High fluorescence quantum yields of over 0.75 with short fluorescence decay times of well under one nanosecond have been obtained. With the exception of two fluorescent brightening agents the tuning ranges are in the violet‐blue region between 415 and 447 nm. The conversion efficiencies range from 1 to 15%. The photochemical stability of the optical brighteners in solution with energy half‐life values between 2 × 104 and 105 J/l, corresponding to average lifetimes of 75 to 200 photons per molecule, is poor in comparison to their known photochemical stability in the adsorbed state.

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Fluorescence Quantum Yields of Laser Dyes Determined by On-Line Computer Evaluation

Cited by 7 publications

References 11 publications

Förster Energy Transfer Studies of Polyelectrolyte Heterostructures Containing Conjugated Polymers: A Means To Estimate Layer Interpenetration

Förster Energy Transfer Studies of Polyelectrolyte Heterostructures Containing Conjugated Polymers: A Means To Estimate Layer Interpenetration

A Functional Hexaphenylbenzene Library Comprising of One, Three, and Six Peripheral Rylene‐Diimide Substituents

Optische Aufheller als Laserfarbstoffe

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