Influence of chromophore dipole moments in parameterts of organic light emitting devices based on phenyl and methyl modified pyrazoloquinoline |
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| Authors: | E. Gondek J. Nizioł A. Danel P. Szlachcic K. Pluciński J. Sanetra I.V. Kityk |
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| Affiliation: | 1. Institute of Physics, Cracow University of Technology, Podchorazych 1, Krakow 30-084, Poland;2. Department of Chemistry, Agricultural University of Krakow, Balicka 122, Krakow 31-149, Poland;3. Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al.Mickiewicza 30, Kraków, Poland;4. Electronics Department, Military Academy of Technology, ul. Kaliskiego 2, Warsaw 00-908, Poland;5. Electrical Engineering Department, Czestochowa University of Technology, Armii Krajowej 17, Czestochowa, Poland;6. Physical Department, College of Science, King Saud University, P.O. Box 2455, Rijadh 11451, Saudi Arabia |
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| Abstract: | Absorption, photo- and electroluminescence spectra of some trityl substituted 1H-pyrazolo[3,4-b]quinolines derivatives (methyl- and phenyl substituted) and fabrication of the single layered organic light emitting diodes are reported. The bulky trityl substituent was introduced to prevent aggregation and crystallization of the dopant in polymer matrix. Role of ground state dipole moments in the observed red Stokes shift, electroluminescent features and photocarrier transport is explored. The maximally achieved brightness about 50 Cd/m2 is observed in the spectral range extending from 443 nm up to 462 nm. The voltage threshold was varied from 7.8 V up to 10 V. The brightness-current dependences show an existence of at least two types of carrier injections. |
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