Combined theoretical and experimental approaches for development of squaraine dyes with small energy barrier for electron injection

Triaryl-1,4-diamine-based polysquaraines: effect of co-solvent and monomer insertion on optoelectronic properties

“…Squaric acid, first synthesized in 1959 by S. Cohen, J. R. Lacher and J. C. Park, and subsequently squaraine dyes, are broadly studied dyes for their low band-gap and near infra-red absorption and emission. [1][2][3][4][5][6][7][8] The first squaric acid based dyes were synthesized in 1965 by A. Treibs and A. Jacob by performing the condensation of squaric acid with pyrrole and phenol derivatives. 1 While the first polysquaraines were also described in this paper, their low solubility hampered their full characterization.…”

Aggregation of Squaraine Dyes in the Deposited Films

“…Залежно від будови, вони широко застосовуються як донори або акцептори електронів при виготовленні сонячних батарей, фотосенсибілізатори, біологічні мітки, сенсори та ін. [1][2][3][4][5]; зокрема, вони можуть бути застосовані разом з фуллеренами С 60 [6]. Внаслідок особливостей хемічної будови сквараїнові барвники об'єднуються у димери [1].…”

Computational Study of the Influence of Nitrogen-Containing Unsaturated Heterocyclic Substituents on Electronic and Spectroscopic Properties of Squaraine Derivatives

“…It has been shown that the tailored design of squaraine structure can enhance the desired properties of their derivatives such as solvatochromism, two-photon absorption or third order hyperpolarizability. − Thus, the squaraine dyes have been of interest for potential applications in various fields of science and technology, starting from dye sentisized solar cells or cation sensors up to fluorescent probes in biomedical approaches. , …”

“…1−4 Thus, the squaraine dyes have been of interest for potential applications in various fields of science and technology, starting from dye sentisized solar cells or cation sensors up to fluorescent probes in biomedical approaches. 5,6 It has been found that the extension of the π-electron skeleton of the squaraine dye and its adequate substitution with electrodonating groups can enhance its desired properties such as two-photon absorption. 1−4 Indolic squaraine derivatives were proven to manifest large optical gap together with the two-photon absorption (TPA) cross section values exceeding 8000 Goeppert−Mayers (GM).…”