Fluorescence study of 9, 10 diphenyl anthracene in mixed Langmuir-Blodgett films with stearic acid

doi:10.1016/0925-3467(94)90026-4

Optical Materials

Volume 3, Issue 1, February 1994, Pages 35-40

https://doi.org/10.1016/0925-3467(94)90026-4 Get rights and content

Abstract

9, 10 diphenyl anthracene is non amphiphilic and does not form stable films at the air-water interface. However, with stearic acid they form highly stable monolayers which may be transferred on to solid substrates with transfer ratio close to unity to form mono and multilayer assemblies. The Langmuir-Blodgett films obtained are highly fluorescent. Spectroscopic studies reveal a two-dimensional structure of the film.

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Cited by (8)

Langmuir-Blodgett films of 9-phenyl anthracene molecules incorporated into different matrices
2005, Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
This communication reports the surface pressure (π) versus area per molecule (A) isotherm characteristics of the mixed films of 9-phenyl anthracene (PA) in stearic acid (SA) and polymethyl methacrylate (PMMA) matrices, at the air–water interface. The mixed Langmuir films at the air–water interface have been observed to be easily transferred onto solid substrates to form uniform Langmuir–Blodgett films. By changing various parameters, namely molefraction, surface pressure of lifting and number of layers, the mixed Langmuir–Blodgett (LB) films of various types have been fabricated successfully and their spectroscopic characteristics have been reported. From the isotherm characteristics and the area per molecule versus molefraction plot, it is evident that the PA molecules are successfully incorporated into mixed Langmuir–Blodgett films. UV–vis absorption spectroscopic study of the mixed LB films at various molefractions of PA in two different matrices reveal that formation of I-type aggregate in PMMA matrix whereas both I- and H-type aggregates are playing their dominant role in SA matrix. Moreover, fluorescence spectroscopic study reveals reabsorption effect. Molecular movement persists in the freshly prepared LB films, as is evident from the time dependent changes in both UV–vis absorption and fluorescence spectra of the mixed LB films in both matrices. From our observation it is evident that about 200 h is required to get the LB films in a stable condition. Dimers and higher order n-mers are formed at a higher surface pressure of 30 mN m⁻¹.
Spectroscopic study of non-amphiphilic 9-phenylanthracene assembled in Langmuir-Blodgett films mixed with stearic acid
1999, Journal of Physics and Chemistry of Solids
This paper reports the incorporation of a non-amphiphilic aromatic hydrocarbon, 9-phenylanthracene (PA), in Langmuir–Blodgett (LB) films mixed with stearic acid (SA), and their spectroscopic properties. The surface pressure–area per molecule isotherms mixed with SA were measured at different molar ratios. From the investigation of absorption and emission spectra and scanning electron microscopy, PA is found to form aggregates. A broad emission was found in both LB films and ethanol–water mixtures, with a maximum at ∼475 nm at room temperature, which is probably aggregation induced. At 77 K, the emission maximum was found to be at ∼508 nm. Emission shift as a result of temperature is explained in terms of exciton–phonon coupling.
Distance-dependent energy transfer between indole and anthracene moieties in Langmuir-Blodgett films
1998, Optical Materials
1,2-Diphenyl indole (DPI) and 9,10-diphenyl anthracene (DPA) are non-amphiphilic molecules but form excellent LB films when mixed with stearic acid (SA). Spectroscopic investigations of these films indicate formation of aggregates of DPI and DPA in the mixed LB films. DPA has been used as the quencher of the fluorescence of the DPI donor. Distance-dependent energy transfer between donor and acceptor monolayers in the LB film, where they can be precisely separated by inert spacers of stearic acid layers of varied thickness, is shown to satisfy Khun's quadratic equation. This suggests that the donor excitations are delocalized. The large critical transfer distance estimated from the experimental results has been attributed to the formation of aggregates of the molecules in a LB monolayer.
A fluorescence study of naphthalene tagged polyvinylalcohol assembled in Langmuir-Blodgett films mixed with stearic acid
1995, Optical Materials
Naphthalene labelled polyvinylalcohol (NAPVA) was synthesised and Langmuir-Blodgett (LB) films of NAPVA mixed with stearic acid (SA) were deposited on glass slides. Excellent uniform and homogeneous films with very high transfer ratios were obtained. A comparative study of the absorption spectra of NAPVA in ethanol, cast film and LB films revealed that the NA chromophores in LB films were preferentially oriented. Emission spectra of NAPVA in ethanol and in cast film show a broad band at 370 nm which corresponds to the second excimer emission of naphthalene which arises due to partial overlap of the NA chromophores. In LB films the NA monomer fluorescence emission as well as the partial excimer emission is observed. Normal sandwich excimer is observed in a turbid ethanol solution and in the bulk material. Our results suggest a uniform distribution of monomeric and partial excimeric NA fluorophores in such LB films.
Orientation effect on distance dependent energy transfer from 1-hexadecyl pyrene to anthracene and perylene Langmuir-Blodgett layers
1994, Solid State Communications
Absorption and emission spectra of 1-hexadecylpyrene (HDP), 9, 10 diphenylanthracene (DPA) and perylene (PE) in stearic acid (SA) mixed Langmuir-Blodgett films have been studied and compared with that in solution. The results indicate the formation of aggregates. The energy transfer from HDP donor to DPA and PE acceptors, where the donor and acceptor could be precisely separated by inert spacers is shown to satisfy Kuhn's quadratic equation. This suggests delocalisation of donor excitation energy. This work further suggests that apart from the formation of donor aggregates, the orientation between the donor and acceptor affect the energy transfer process appreciably.
Photophysics and dynamics of surface plasmon polaritons-mediated energy transfer in the presence of an applied electric field
2012, Journal of the American Chemical Society

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Fluorescence study of 9, 10 diphenyl anthracene in mixed Langmuir-Blodgett films with stearic acid

Abstract

Thin Solid Films

Thin Solid Films

J. Colloid Interface Sci.

J. Photochem.

Langmuir

Electron crystallography of organic molecules

J. Am. Chem. Soc.

Thin Solid Films

Thin Solid Films