Growth and characterisation of centimetre-sized single crystals of molecular organic materials

Campione, Marcello; Ruggerone, Riccardo; Tavazzi, Silvia; Moret, Massimo

doi:10.1039/b415912h

Cited by 49 publications

(51 citation statements)

References 17 publications

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“…Single crystals were grown either i) by placing the purified powder in a glass crucible and heating it at 150 8C in a system for the crystal growth by the physical vapor transport method using nitrogen as gas carrier or ii) in solution of anisole by the floating-drop technique [36] using deionized water as liquid substrate. The thickness of the grown samples is of the order of few micrometers.…”

Section: Methodsmentioning

confidence: 99%

Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

et al. 2010

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Blue amplified spontaneous emission at room temperature is demonstrated from the exposed face of the strongly emitting organic semiconductor 1,1,4,4-tetraphenyl-1,3-butadiene in single crystal form. The symmetry of the crystal and calculation of lattice sums indicate the J-type organization of the molecular transition moments. The minimum in the lowest exciton dispersion branch, from which emission takes place, is found at the edge of the Brillouin zone leading to a dominant vibronic emission since the zero-phonon line is forbidden. The observed gain narrowed line is attributed to the vibronic replica which becomes amplified with increased pumping. The reported emission is along the normal to the exposed crystal face, important for the development of vertical cavity geometry lasers based on organic single crystals. The threshold excitation fluence of 400 microJ cm(-2) is comparable to other organic crystalline systems, even if the amplification path is much reduced as a consequence of the vertical geometry. Considering these relevant aspects, the optical characterization of this material is provided. The polarized absorption spectra are reported and the properties of the lowest-energy excitonic state investigated. Calculation of the electronic transitions for the isolated molecule, lattice sums for the transition at lowest energy, and the symmetry of the crystal allow attributing the largest face of the samples and the observed optical bands in the spectra. Polarized time-resolved spectra are also reported allowing to identify the intrinsic excitonic emission.

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Section: Methodsmentioning

confidence: 99%

Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

et al. 2010

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“…10. Single crystals of the lowtemperature polymorph of ␣-4T ͑␣-4T / LT͒ have been grown from solution by the floating-drop method, 11 obtaining crystals with size up to a few cm 2 and controlled thickness. A few micron thick crystals, as measured by a Digital Instrument Dektak 8 profilometer, have been selected for the optical and morphological characterization and placed on fused silica or on a high value refractive index glass substrate.…”

Section: Methodsmentioning

confidence: 99%

Reflectance anisotropy spectroscopy: A probe to explore organic epitaxial growth

Bussetti

Cirilli

Violante

et al. 2009

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Reflectance anisotropy spectroscopy ͑RAS͒ is demonstrated to be particularly suitable for studying the deposition of organic epitaxial layers in ultrahigh vacuum by organic molecular beam epitaxy, thanks to its high sensitivity and applicability in situ. In the case of ␣-quaterthiophene, both homoepitaxy and heteroepitaxy have been monitored, demonstrating the crystallinity of the films up to tens of monolayers and the epitaxial relation to the substrate. In both cases, optical RAS data are compared to the results of ex situ characterization of the same samples by atomic force microscopy.

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“…To further reduce the nucleation, often induced by the vessel walls, the solution can be left on the surface of a denser and immiscible liquid. This method has been described elsewhere and called floating-drop technique (Adachi et al 2003;Campione et al 2005). For example, single crystals of DBTDT were obtained by such a floating-drop technique.…”

Section: Floating-drop Growthmentioning

confidence: 99%

Optical Properties of Molecular Crystals: The Effect of Molecular Packing and Polymorphism

Tavazzi¹,

Silvestri²,

Spearman³

2012

Crystallization and Materials Science of Modern Artificial and Natural Crystals

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Growth and characterisation of centimetre-sized single crystals of molecular organic materials

Cited by 49 publications

References 17 publications

Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

Reflectance anisotropy spectroscopy: A probe to explore organic epitaxial growth

Optical Properties of Molecular Crystals: The Effect of Molecular Packing and Polymorphism

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