Optoelectronic features of Y-shaped push–pull molecules based on imidazole
- 220 Downloads
The paper involves organic light-emitting diodes fabricated with application of Y-shaped push–pull imidazole derivatives (chromophores) blended with poly(N-vinylcarbazole) as an organic active materials. The absorbance, photoluminescence and electroluminescence spectra of chromophores as well as electroluminescence–voltage, current–voltage and electroluminescence–voltage of the manufactured devices are presented. All investigated imidazole derivatives dissolved in tetrahydrofuran exhibited strong luminescence. The investigated organic light-emitting diodes exhibit red-shift in the main spectral maxima from 520 to 598 nm for photoluminescence and from 535 to 590 nm for electroluminescence depending on the type of imidazole derivative used. The electroluminescence spectra also proved to be very stable over the luminance range from 700 to 1600 cd/m2, which is the luminance used for typical lighting applications.
KeywordsOrganic light-emitting diode Imidazole derivative Photoluminescence Electroluminescence
This work was supported by the National Science Centre on the basis of decision DEC-2011/03/B/ST7/03538. The synthesis of organic Y-shaped imidazole molecules was supported by the Czech Science Foundation (13-01061S).
- Kalinowski, J.: Organic Light-Emitting Diodes Principles, Characteristics, and Processes. Marcel Dekker, New York (2005)Google Scholar
- Knauer, K.A., Najafabadi, E., Haske, W., Gaj, M.P., Davis, K.C., Fuentes-Hernandez, C., Carrasco, U., Kippelen, B.: Stacked inverted top-emitting green electrophosphorescent organic light-emitting diodes on glass and flexible glass substrates. Org. Electron. 14, 2418–2423 (2013)CrossRefGoogle Scholar
- Müllen, K., Scherf, U. (eds.): Light Emitting Devices. Synthesis, Properties and Applications. Wiley-VCH, Weinheim (2006)Google Scholar
- Song, M., Yun, S.-J., Nam, K.-S., Liu, H., Gal, Y.-S., Lee, J.W., Jin, S.H., Lee, J.Y., Kang, S.K., Kim, Y.I.: Highly efficient solution-processed pure red phosphorescent organic light-emitting diodes using iridium complexes based on 2,3-diphenylquinoxaline ligand. J. Organomet. Chem. 794, 197–205 (2015)CrossRefGoogle Scholar
- Vasilopoulou, M., Georgiadou, D.G., Soultati, A., Douvas, A.M., Papadimitropoulos, G., Davazoglou, D., Pistolis, G., Stathopoulos, N.A., Kamalakis, T., Alexandropoulos, D., Vainos, N., Politi, C.T., Palilis, L.C., Couris, S., Coutsolelos, A.G., Argitis, P.: Solution processed multi-color organic light emitting diodes for application in telecommunications. Microelectron. Eng. 145, 21–28 (2015)CrossRefGoogle Scholar