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

[Display omitted] •Solution processable organic light emitting diodes (OLEDs).•Bithiophene disubstituted 1,3,4-thiadiazoles as a new class of bluish-green emitters.•Effective guest–host electroluminescent systems for application in OLEDs. Photo- and electroluminescence of five bithiophene disubstitu...

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Bibliographic Details
Published in:Optical materials 2014-11, Vol.37, p.193-199
Main Authors: 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, Aprano, Salvatore
Format: Article
Language:English
Subjects:
Applied sciences
Bands
Bithiophene disubstituted 1,3,4-thiadiazoles
Color
Derivatives
Electroluminescence
Electronics
Exact sciences and technology
Host/guest electroluminescent system
Luminance
Optoelectronic devices
Optoelectronics
Organic light emitting diodes
Polyvinyl carbazole
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:[Display omitted] •Solution processable organic light emitting diodes (OLEDs).•Bithiophene disubstituted 1,3,4-thiadiazoles as a new class of bluish-green emitters.•Effective guest–host electroluminescent systems for application in OLEDs. 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 (750cd/m2) was measured for 2,5-bis(5′-octyl-2,2′-bithiophene-5-yl)-1,3,4-thiadiazole with the luminous efficiency exceeding 0.4cd/A.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2014.05.023