1. Photo- and electroluminescent properties of bithiophene disubstituted 1,3,4-thiadiazoles and their application as active components in organic light emitting diodes.
- Author
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Grykien, Remigiusz, Luszczynska, Beata, Glowacki, Ireneusz, Kurach, Ewa, Rybakiewicz, Renata, Kotwica, Kamil, Zagorska, Malgorzata, Pron, Adam, Tassini, Paolo, Maglione, Maria Grazia, Mauro, Anna De Girolamo Del, Fasolino, Tommaso, Rega, Romina, Pandolfi, Giuseppe, Minarini, Carla, and Aprano, Salvatore
- Subjects
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ELECTROLUMINESCENCE , *PHOTOLUMINESCENCE , *THIOPHENES , *ORGANIC light emitting diodes , *THIADIAZOLES , *SUBSTITUENTS (Chemistry) - 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 C α 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/m 2 ) 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. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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