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Some spirobiindane based 1H-pyrazolo [3,4-b] quinoline chromophore as novel chromophore for light-emitting diodes |
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| Authors: | E. Gondek J. Nizio? I.V. Kityk P. Szlachcic T. Uchacz G. Lakshminarayana |
| Affiliation: | a Institute of Physics, Cracow University of Technology, Podchorazych 1, 30-084 Krakow, Poland b Department of Chemistry and Physics, Agricultural University of Krakow, Balicka 122, Krakow 31-149, Poland c Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, Krakow, Poland d Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland e Military Technical Academy of Warsaw, ul. Kaliska 4, Warsaw, Poland f Electrical Engineering Department, Czestochcowa University of Technology, Armii Krajowej 17, PL-42-201, Poland g Department of Materials Science and Engineering, Nagoya Institute of Technology, Showa, Nagoya 466-8555, Japan |
| Abstract: | An influence of phenoxy groups for the luminescent and electroluminescent properties of spiro-compounds with pyrazolo [3,4-b] quinoline structure (fluorophore) chromophore has been studied. All the compounds exhibit strong fluorescence in solution and in solid state as well. The prepared compounds were used as dopant chromophore in PVK polymer matrices for electroluminescent (EL) and light-emitting diode (LED) devices with configuration ITO/PEDOT-PSS/PVK/PQ/Ca/Al. Role of the bathochromic shifts and solvent polarity in absorption and photoluminescent maxima is considered. Relation between the number of pyrazoloquinoline chromophore and presence of phenyl group on the fluorescence spectra is explored. Polarizability of the particular pyrazoloquinoline compounds on the solvatochromic effects is investigated. Possible ways of enhancement of the brightness in the light-emitting properties of the mentioned chromophore are discussed. |
| Keywords: | 1H-pyrazolo [3,4-b] quinolines Electroluminescence OLED Spiro-compounds |
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