Photoluminescence and electroluminescence of methoxy and carboethoxy derivatives of 1,3-diphenyl-1H-pyrazolo[3,4-b]quinoline.
A series of methoxy (MO) and carboethoxy (CE) derivatives of 1,3-diphenyl-1H-pyrazolo[3,4-b]quinoline ([DPPQ]) are characterized by spectroscopic methods. All dyes show the photoluminescent spectra which are highly solvatochromic. In the case of 6MO[DPPQ] and 6CE[DPPQ] the emission bands are broad and shifted to the red with increasing of solvent polarity whereas the dyes 6MO1pMO[DPPQ] and 6MO13pMO[DPPQ] exhibit a reverse solvatochromism. The large difference between the excited- and state-dipole moments indicates a strong electron transfer effects in all dyes. The EL spectra are obtained for the fabricated OLEDs with a general structure of EL device ITO/PVK:6X[DPPQ]/Ca/Al. The blue emission originating from PVK host matrix appears to be quenched in EL spectra of doped PVK matrix giving rise to emission in blue, blue-green or green spectral regions. The obtained results demonstrate that a series of newly synthesized methoxy and carboethoxy [DPPQ]-derivatives may be considered as promising materials for electroluminescent applications.
Gondek
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E
Institute of Physics, Technical University of Krakow, Podhorazych 1, 30-084 Krakow, Poland.
Całus
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S
Danel
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A
Kityk
A V
AV
D004560:Electricity; D049449:Luminescence; D008968:Molecular Conformation; D011720:Pyrazoles / Q000737:chemistry*; D011804:Quinolines / Q000737:chemistry*; D012997:Solvents; D013057:Spectrum Analysis
C527772:1,3-diphenyl-1H-pyrazolo(3,4-b)quinoline; D011720:Pyrazoles; D011804:Quinolines; D012997:Solvents; C037219:quinoline