Organic fluorescent dyes trapped in silica and silica-titania thin films by the sol-gel method. Photophysical, film and cage properties

Avnir, David; Kaufman, Vered R.; Reisfeld, R.

doi:10.1016/0022-3093(85)90081-x

Cited by 405 publications

(169 citation statements)

References 21 publications

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“…This so-called "solvent shift" leads to a shift of the emission wavelength of each pyrene molecule depending on its environment. 33 We suppose that different chain lengths are probably responsible for the shoulder shape of the electroluminescence spectrum. Thus, one can explain the wide band of emitted frequencies.…”

mentioning

confidence: 90%

Novel Electroluminescent Polymer Derived from Pyrene-Functionalized Polyaniline

Amarnath¹,

Kim²,

Yi³

et al. 2011

Bulletin of the Korean Chemical Society

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A solution processable polymer was synthesized, by incorporating pyrene groups into the backbone of the polyaniline chain, and used as an emissive layer in an organic light emitting diode. The polyaniline base was reacted with acid chloride of pyrene butyric acid to form pyrene-functionalized polyaniline chains. The source of pyrene moiety was acid chloride of pyrene butyric acid. The formation of polymer from acid chloride of pyrene butyric acid and polyaniline was confirmed by the FTIR and 1 H-NMR spectroscopy. Differential scanning calorimetry revealed high glass transition temperature of 210 o C. Due to the presence of pyrene moieties in the backbone, the polyaniline synthesized in the present study is solution processable with light emitting property. The photoluminescence spectrum of the polymer revealed that emission lies in the blue region, with a peak at 475 nm. The light emitting device of this polymer exhibits the turn-on voltage of 15 V.

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mentioning

confidence: 90%

Novel Electroluminescent Polymer Derived from Pyrene-Functionalized Polyaniline

Amarnath¹,

Kim²,

Yi³

et al. 2011

Bulletin of the Korean Chemical Society

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“…[25]. Dag and co-workers have fabricated mesoporous TiO 2 using Ti(OEt) 4 as precursor and non-ionic surfactant CH 3 (CH 2 ) n (OCH 2 CH 2 ) m OH [26], which is similar to Triton X-100.…”

Section: Films Fabricationmentioning

confidence: 99%

“…1). The surfactant decreases the capillary stresses and avoids a destroying of the layered structure during drying process [25]. As a consequence the layer structure is more modified and its surface is more rough.…”

Section: Sample Characterizationmentioning

confidence: 99%

Nano-sized blue spectral shift in sol–gel derived mesoporous titania films

Karasiński

Gondek

Drewniak

et al. 2011

J Sol-Gel Sci Technol

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Following the spectral energy shift of the energy gap (blue shift) of the TiO 2 sol-gel derived films we have evaluated diameters of the nanocrystallites. The TiO 2 films were deposited by dip-coating technique. Two types of mesoporous films were studied: films with porosity *16% and refractive index (2.15 at wavelength 633 nm) and films with porosity *46% and refractive index (1.61 at wavelength 633 nm). High porosity and consequently low refractive index was achieved by adding the non-ionic surfactant Triton X-100 to the starting solution as template. The principal goal of the work is to establish the influence of the Triton X-100 on the morphology as well as to establish a possible correlation between the morphology and optical features of the titania films. The surface morphology was explored using AFM method. And the energy gap was determined from the transmission spectra. Analysis of the blue energy spectral shift is performed following the excitonic model.

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“…This method also enables the preparation of organic-inorganic composite materials, 2,3 where metal alkoxide solutions containing functional organic molecules are used as the starting materials. The most widely used are alkoxysilanes such as tetraethoxysilane (TEOS).…”

Section: Introductionmentioning

confidence: 99%

Excited-state Intramolecular Proton Transfer of 1,5- and 1,8-Dihydroxyanthraquinones Chemically Adsorpted onto SiO₂, SiO₂-Al₂O₃, and Al₂O₃Matrices

Cho¹,

Song²,

Park

et al. 2007

Bulletin of the Korean Chemical Society

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In order to investigate the excited-state intramolecular proton transfer (ESIPT) process of dihydroxyanthraquinones (DHAQ; 1,5-DHAQ and 1,8-DHAQ) in organic-inorganic hybrid matrices, transparent SiO2, SiO2-Al2O3, and Al2O3 matrices chemically bonded with DHAQ were prepared using a sol-gel technique. The absorption maxima of 1,5-and 1,8-DHAQ in SiO2 matrices are observed at around 420 nm, whereas those of DHAQ in both SiO2-Al2O3 and Al2O3 matrices are markedly shifted to longer wavelength compared with those in SiO2 matrix. This indicates that DAHQ forms a chemical bond with an Al atom of Al2O3. The DHAQ in SiO2 matrix shows a markedly Stokes-shifted emission which is originated from the ESIPT in DHAQ. Based on the emission lifetimes of DHAQ, the ESIPT of DHAQ was found to be strongly affected by the chemical interaction with Al atom in the Al2O3-related matrices.

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Organic fluorescent dyes trapped in silica and silica-titania thin films by the sol-gel method. Photophysical, film and cage properties

Cited by 405 publications

References 21 publications

Novel Electroluminescent Polymer Derived from Pyrene-Functionalized Polyaniline

Novel Electroluminescent Polymer Derived from Pyrene-Functionalized Polyaniline

Nano-sized blue spectral shift in sol–gel derived mesoporous titania films

Excited-state Intramolecular Proton Transfer of 1,5- and 1,8-Dihydroxyanthraquinones Chemically Adsorpted onto SiO₂, SiO₂-Al₂O₃, and Al₂O₃Matrices

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Organic fluorescent dyes trapped in silica and silica-titania thin films by the sol-gel method. Photophysical, film and cage properties

Cited by 405 publications

References 21 publications

Novel Electroluminescent Polymer Derived from Pyrene-Functionalized Polyaniline

Novel Electroluminescent Polymer Derived from Pyrene-Functionalized Polyaniline

Nano-sized blue spectral shift in sol–gel derived mesoporous titania films

Excited-state Intramolecular Proton Transfer of 1,5- and 1,8-Dihydroxyanthraquinones Chemically Adsorpted onto SiO2, SiO2-Al2O3, and Al2O3Matrices

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Excited-state Intramolecular Proton Transfer of 1,5- and 1,8-Dihydroxyanthraquinones Chemically Adsorpted onto SiO₂, SiO₂-Al₂O₃, and Al₂O₃Matrices