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

Remigiusz Grykien, Beata Luszczynska, Ireneusz Glowacki, Ewa Kurach, Renata Rybakiewicz, Kamil Kotwica, Malgorzata Zagorska, Adam Pron, Paolo Tassini, Maria Grazia Maglione, Anna De Girolamo Del Mauro, Tommaso Fasolino, Romina Rega, Giuseppe Pandolfi, Carla Minarini, Salvatore Aprano

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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 Cαposition 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.
Original languageEnglish
Pages (from-to)193 - 199
Number of pages7
JournalOptical Materials
Issue numberC
Publication statusPublished - 2014
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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