Visible fluorescence on IR excitation of polar dimethylaminobenzylidene 1,3‐indandione crystals

Valkūnas, Leonas; Juodžbalis, D.; Urbas, Antanas; Gruodis, Alytis; Durandin, Alexander; Silinsh, E. A.; Klimkāns, Agris; Larsson, Sven

doi:10.1002/amo.860020503

Cited by 18 publications

(23 citation statements)

References 5 publications

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“…1 There is a hypothesis that DMABI molecule can change it molecular geometry after irradiation in PIET spectral region. In this case a photoinduced twisting between two equally stable states of the molecule takes place (see Fig.1, b), which may lead to redistribution of molecules in polymer matrix [3]. The photoreorientation of DMABI molecules in polymer matrix is confirmed by studies of the second harmonic generation effect after all-optical poling of the samples [4].…”

Section: Introductionmentioning

confidence: 78%

Light induced processes in thin films of indandione type organic molecules

et al. 2007

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The optically induced switching of material properties is important for investigations of opto-electronic effects and optomechanical properties. Investigated organic materials contain chromophore dipole consisting of acceptor and donor groups bridged by a delocalized π-electron system. Both calculations and experimental data show a reversible highly dipolar photoinduced intra molecular charge transfer in indandione type molecules (DMABI) accompanied by change of the sign and the value of the dipole moment. Investigations of optical properties of thin host-guest polymer films show that the photoinduced process of DMABI is related to the photoinduced switching between two equally stable states of the molecule. In this work first results of formation of the surface relief in polymer films incorporated with DMABI derivatives will be presented. The refractive index gratings of DMABI host-guest films show that red light is less diffracted than blue one. The reversible surface potential changes on irradiation in photoinduced intramolecular electron transfer band in polymer host-guest films is observed. The DMABI molecules in solid state have nonlinear optical properties, which can be used and investigated in host-guest polymer matrix. The influence of concentration of DMABI molecules on photoinduced processes is discussed.

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Section: Introductionmentioning

confidence: 78%

Light induced processes in thin films of indandione type organic molecules

et al. 2007

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“…5 The visible band (M) (maximum at 2.54 eV) corresponds to the intramolecular absorption of the entire DMABI molecule.5 Strong dependence of the absorption spectrum on the solvent polarity (the maximum shifts from 2.71 eV in heptane to 2.51 eV in dimethylsufoxide), indicating the dipolar character of the Ðrst singlet intramolecular transition, was also observed. 4 Owing to intermolecular interaction in the crystal structure the molecular spectrum broadens and splits into several exciton bands. The main crystal-phase absorption band (C) of the Ðlms deposited in vacuum is located below the molecular band (M), i.e.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopy of self-trapped charge-transfer excitons in polar films and crystals of N,N-dimethylaminobenzylidene 1,3-indandione (DMABI)

Juršėnas¹,

Gulbinas²,

Gruodis³

et al. 1999

Phys. Chem. Chem. Phys.

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The origin of exciton states in crystals built up by dipolar N,N-dimethylaminobenzylidene 1,3-indandione (DMABI) molecules has been investigated by means of absorption and luminescence spectroscopy. The exciton spectral and dynamical properties in the solid state are compared to those of the excitation of separated DMABI molecules embedded in a rigid polymer matrix. The luminescence excitation spectra and the luminescence decay kinetics are discussed on the basis of the speciÐc adiabatic potential-energy scheme of the self-trapped excitons.

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“…IΡB and DMABI are excellent photoconductors [1,3,14,15] and promising for non-linear optics [14,16].…”

Section: ιNdandione-13 Pyridinium Belaine (Ipb) and Dimethylamińobenmentioning

confidence: 99%

Investigation of Local Trapping States in Organic Molecular Crystals by Method of Thermally Modulated Space-Charge Limited Current

Muzikante

Silinsh

1995

Acta Phys. Pol. A

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The method of thermally modulated space-charge limited current has been used for studying local charge carrier trapping state energy spectra in vacuum evaporated thin films and Langmuir-Blodgett multilayers of different organic molecular crystals. In case of evaporated thin polycrystalline layers of pentacene four sets of local trapping states in energy range from Et = 0.35 to 0.06 eV were observed. In evaporated thin layers of dimethylaminobenzylidene indandione-1,3 five sets of trapping states from Ε, = 0.59 to 0.28 eV were detected. In the evaporated 1ayers of indandione-1,3 pyridinium betaine only a single set of very shallow trapping states close to the conductivity level was observed. In the Langmuir-Blodgett multilayers of vanadyl phthalocyanine and indandione-1,3 pyridinium betaine the activation energy Ea dependence on applied voltage U, Ea(U), for bulk conductivity is not step-like as in case of evaporated layers, but of rather complicated, oscillatory shape. Such character of the Ea (U) dependence may be explained by the specific quantum well structure of the Langmuir-Biodgett multilayers and spatially nonuniform trap distribution. However, for in-plane conductivity of indandione-1,3 pyridinium betaine films the Ea(U) dependence is step-like and two sets of trapping states at Ε, = 0.45 ± 0.03 eV and E, = 0.18 ± 0.03 eV were obtained. In case of bulk conductivity of the Langmuir-Blodgett layers the activation energy E a at sufficiently high electric fields drops down to zero and the charge carrier transport switches to a "trap-free" regime.

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Visible fluorescence on IR excitation of polar dimethylaminobenzylidene 1,3‐indandione crystals

Cited by 18 publications

References 5 publications

Light induced processes in thin films of indandione type organic molecules

Light induced processes in thin films of indandione type organic molecules

Spectroscopy of self-trapped charge-transfer excitons in polar films and crystals of N,N-dimethylaminobenzylidene 1,3-indandione (DMABI)

Investigation of Local Trapping States in Organic Molecular Crystals by Method of Thermally Modulated Space-Charge Limited Current

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