Suppression of the excimer photoluminescence in a poly(arylene–ethynylene) co-polymer

Pizzoferrato, R.; Ziller, T.; Micozzi, A.; Ricci, Antonella; Sterzo, Claudio Lo; Ustione, Alessandro; Oliva, C.; Cricenti, A.

doi:10.1016/j.cplett.2005.08.074

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…It exhibits an emission peak at 520 nm with a maximum brightness of 449 cd/cm 2 at ∼15 V. The device performance is, however, still superior to that of 3 , which displays a maximum luminance of merely 219 cd/cm 2 at 21 V. Among the devices of the three dyes, the device of 3 displays an emission spectrum in the longest wavelength region, with two emission maximums at 556 and 580 nm. The poor device performance of this conventional, non-AIE dye is probably due to the formation of the excimeric species, which have served as energy traps in its electroluminescence process 8 (A) Electroluminescence spectrum of 1 , 2 , and 3 at 16, 12, and 16 V, respectively.…”

Section: Resultsmentioning

confidence: 99%

Aggregation-Induced Emission: Effects of Molecular Structure, Solid-State Conformation, and Morphological Packing Arrangement on Light-Emitting Behaviors of Diphenyldibenzofulvene Derivatives

et al. 2007

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Propeller-shaped molecules diphenyldibenzofulvene (1) and (4-methoxyphenyl)phenyldibenzofulvene (2) were nonemissive when dissolved in good solvents but became luminescent when aggregated in poor solvents or in the solid state, showing a novel phenomenon of aggregation-induced emission (AIE). 8-Phenylbenzo[e]-acephenanthrylene (3), a ring-closed form of 1 with one of its phenyl blades locked, was emissive in the solutions, suggesting that the AIE effects of 1 and 2 are caused by the restrictions of intramolecular rotations of their aromatic blades in the aggregation state. The crystals of 1 and 2 emitted stronger, bluer lights than their amorphous powders, possibly due to the structural rigidification and conformational twisting of the dye molecules in the crystalline phase. The light-emitting diodes with a device configuration of ITO/NPB/dye/ BCP/Alq 3 /LiF/Al were fabricated, which emitted bluish-green and yellow lights with maximum luminance and current efficiency up to 5000 Cd/m 2 and 1.90 Cd/A, respectively.

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Section: Resultsmentioning

confidence: 99%

Aggregation-Induced Emission: Effects of Molecular Structure, Solid-State Conformation, and Morphological Packing Arrangement on Light-Emitting Behaviors of Diphenyldibenzofulvene Derivatives

et al. 2007

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“…UV–vis absorption spectra were recorded with a Cary 50 spectrophotometer (Varian Inc., Palo Alto, CA, USA, USA) by using fused silica cuvettes with 10 mm optical path. Photoluminescence (PL) spectra were acquired on a laboratory set-up [ 38 ] equipped with an emission 25 cm monochromator (Cornerstone 260, Oriel Instruments, Stratford, CT, USA), specific excitation-rejection filters, and a R3896 photomultiplier (Hamamatsu Photonics Corporation, Bridgewater, NJ, USA), by using an optical length of 10 mm in a standard 90° geometry to reduce the effective sample length experienced by both the excitation and the emission light to 0.5 mm, approximately. In this way, it was possible to reduce artefacts in the PL quenching due to inner filter effects and transmittance variations [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

Discriminating between Different Heavy Metal Ions with Fullerene-Derived Nanoparticles

Ciotta

Prosposito

Tagliatesta

et al. 2018

Sensors

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A novel type of graphene-like nanoparticle, synthesized by oxidation and unfolding of C60 buckminsterfullerene fullerene, showed multiple and reproducible sensitivity to Cu2+, Pb2+, Cd2+, and As(III) through different degrees of fluorescence quenching or, in the case of Cd2+, through a remarkable fluorescence enhancement. Most importantly, only for Cu2+ and Pb2+, the fluorescence intensity variations came with distinct modifications of the optical absorption spectrum. Time-resolved fluorescence study confirmed that the common origin of these diverse behaviors lies in complexation of the metal ions by fullerene-derived carbon layers, even though further studies are required for a complete explanation of the involved processes. Nonetheless, the different response of fluorescence and optical absorbance towards distinct cationic species makes it possible to discriminate between the presence of Cu2+, Pb2+, Cd2+, and As(III), through two simple optical measurements. To this end, the use of a three-dimensional calibration plot is discussed. This property makes fullerene-derived nanoparticles a promising material in view of the implementation of a selective, colorimetric/fluorescent detection system.

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“…UV‐vis spectra were acquired by a Varian Cary 50 Scan spectrophotometer in DMF or CH 2 Cl 2 solution. Photoluminescence (PL) emission spectra were obtained by using a specific laboratory set‐up equipped with a continuous‐wave 200‐W Hg(Xe) discharge lamp (Oriel Corp.) monochromatized with an excitation 25‐cm monochromator (PMI), an emission 25‐cm monochromator (Oriel Cornerstone 260) and a Hamamatsu R3896 photomultiplier as emission light detector. Diluted solution in spectroscopic DMF, with an absorbance <0.1 OD in the range 250–400 nm, were prepared for the PL spectra and characterized by using conventional 90° geometry on fused‐silica cuvettes with an optical path‐length of 10 mm.…”

Section: Methodsmentioning

confidence: 99%

Functionalization of Carbon Spheres with a Porphyrin−Ferrocene Dyad

et al. 2018

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Meso-tetraphenylporphyrin connected with a ferrocene molecule in the beta-position of the macrocycle through a triple carbon-carbon bond has been bound to carbon spheres using the Prato-Maggini reaction. The ethynyl or/and phenylene ethynylene subunits were chosen as a linking bridge to give a high conjugation degree between the donor (i. e., ferrocene), the photoactive compound (i. e., porphyrin), and the acceptor (i. e., carbon spheres). The molecular bridges have been directly linked to the beta-pyrrole positions of the porphyrin ring, generating a new example of a long-range donor-acceptor system. Steady-state fluorescence studies together with Raman and XPS measurements helped understanding the chemical and physical properties of the porphyrin ring in the new adduct. The spectroscopic characteristics were also compared with those obtained from a similar compound bearing fullerene instead of carbon spheres.

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Suppression of the excimer photoluminescence in a poly(arylene–ethynylene) co-polymer

Cited by 15 publications

References 32 publications

Aggregation-Induced Emission: Effects of Molecular Structure, Solid-State Conformation, and Morphological Packing Arrangement on Light-Emitting Behaviors of Diphenyldibenzofulvene Derivatives

Aggregation-Induced Emission: Effects of Molecular Structure, Solid-State Conformation, and Morphological Packing Arrangement on Light-Emitting Behaviors of Diphenyldibenzofulvene Derivatives

Discriminating between Different Heavy Metal Ions with Fullerene-Derived Nanoparticles

Functionalization of Carbon Spheres with a Porphyrin−Ferrocene Dyad

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