Large Area Free-Standing Single Crystalline Films of p-Quinquephenyl: Growth, Structure and Photoluminescence Properties

Abstract

Studies of the growth of large-area free-standing single-crystalline films of p-quinquephenyl are presented. High-quality crystals were grown by slow cooling of a hot chlorobenzene solution. Worse quality large-area free-standing single crystals of p-quinquephenyl were also grown by using physical vapor transport and used for comparison. The crystal structure of p-quinquephenyl at 293 K and 85 K was refined by single-crystal X-ray diffraction. The optical absorption and photoluminescence spectra of solutions and crystalline films were obtained and analyzed; a positive solvatochromic effect was detected.

A new linear phenyloxazole–benzothiadiazole luminophore: crystal growth, structure and fluorescence properties

“…The contribution of these molecules to the absorption spectrum is small, since the concentration of dislocations in crystals obtained by sublimation is usually small (Lisovenko et al, 1975). Similar phenomena were observed for p-quinquephenyl (Postnikov et al, 2020b).…”

“…Due to the very low solubility the method of physical vapor transport (PVT) (Laudise et al, 1998;Postnikov et al, 2020b) was applied for the growth of BTD(PO) 2 crystals. The inner diameter of the growth quartz tube was 19 mm.…”

“…It can be assumed that flexible conjugation of the central BTD fragment with the neighboring phenyl groups in the molecule makes it possible to achieve the highest packing density for the unfolded conformation, rather than for the planar one. For comparison, crystals based on linear molecules consisting of five conjugated units in a planar conformation are characterized by a lower density value, for example, pentacene 1.324 g cm À3 (Schiefer et al, 2007), p-quinquephenyl 1.292 g cm À3 (Postnikov et al, 2020b), POPOP 1.314 g cm À3 (Schindler et al, 2010) and 1,4-bis(5-phenylthiophen-2yl)benzene (AC5) 1.395 g cm À3 (Yamao et al, 2007).…”

Growth and Characterization of Centimeter-Scale Pentacene Crystals for Optoelectronic Devices

“…The PVT system for growing crystals in a gradient temperature field was designed according to the classical scheme [17,24] and was used in the first stage of growth studies. A mixture of argon with 5% hydrogen (purity 99.9999%) was used as the carrier gas during crystal growth.…”

“…This area of research is important for both fundamental and applied problems related to organic electronics. While classic setups with a gradient thermal field are more commonly used [17,24], some growth setups with several temperature zones forming a stepped thermal field profile have been explored in the literature. In particular, some studies have reported success in obtaining centimeter-scale organic semiconductor crystals using a PVT setup with two temperature zones [25][26][27][28], which allows for more precise control over the temperature field inside the growth tube compared to the gradient method.…”