Photo- and electroluminescent properties of bithiophene disubstituted 1,3,4-thiadiazoles and their application as active components in organic light emitting diodes

TitlePhoto- and electroluminescent properties of bithiophene disubstituted 1,3,4-thiadiazoles and their application as active components in organic light emitting diodes
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2014
AuthorsGrykien, R., Luszczynska B., Glowacki I., Kurach E., Rybakiewicz R., Kotwica K., Zagorska M., Pron A., Tassini P., Maglione Maria Grazia, De Girolamo Del Mauro Anna, Fasolino T., Rega R., Pandolfi G., Minarini Carla, and Aprano S.
JournalOptical Materials
Volume37
Pagination193-199
ISSN09253467
Keywords1, 3, 4-thiadiazoles, Active components, Diodes, Electroluminescence, Electroluminescent properties, Host/guest electroluminescent system, light, Light emitting diodes, Luminous efficiency, Organic light emitting diodes (OLED), Organic light emitting diodes(OLEDs), Poly(N-vinylcarbazole), Solution processable
Abstract

Photo- and electroluminescence of five bithiophene disubstituted 1,3,4-thiadiazoles, constituting a new class of solution processable materials for organic opto-electronics, were studied. It was found that the introduction of alkyl solubilizing substituents bathochromically shifted the photo- and electroluminescence bands. The most pronounced effect was observed for the substitution at the Cα position which changed the emitting light color from bluish to green. All five derivatives were tested in host/guest type organic light emitting diodes (OLEDs) with either poly(N-vinylcarbazole) (PVK) or poly(N-vinylcarbazole) + 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PVK + PBD) matrices. The latter matrix turned out especially well suited for these guest molecules yielding devices of varying color coordinates. The best luminance (750 cd/m2) was measured for 2,5-bis(5'-octyl-2,2'-bithiophene-5-yl)-1,3,4-thiadiazole with the luminous efficiency exceeding 0.4 cd/A. © 2014 Elsevier B.V. All rights reserved.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84929026180&doi=10.1016%2fj.optmat.2014.05.023&partnerID=40&md5=f0ce41acd2c2fe54ddf654be66b90c1d
DOI10.1016/j.optmat.2014.05.023