Trifluoromethyl Substituted Derivatives of Pyrazoles as Materials for Photovoltaic and Electroluminescent Applications

New 6-CF3-1H-pyrazolo[3,4-b]quinolines with a methyl and/or phenyl group attached to the pyrazole core (Molx (x = 1, 2, 3, 4)) were synthesized and characterized in terms of their optoelectronic applications: photovoltaic electroluminescence. The fluorescence emissions investigated phenyl-decorated pyrazoloquinolines is caused by photoinduced charge transfer p process occurring between substituent pyrazoloquinoline core, while 1,3-dimethyl-6-CF3-1H-pyrazolo[3,4-b]quinoline exhibits an π,π*-type emission. number phenyls substitution positions modulate both emission properties HOMO energy levels. Next, bulk heterojunction BHJ solar cells based on 1H-pyrazolo[3,4-b] quinoline derivatives architecture ITO/PEDOT:PSS/PDT + Molx/Al fabricated. organic active layer was blend Molx poly(3-decylthiophene-2,5-diyl). complex refractive index thickness determined using spectroscopic ellipsometer Woollam M2000 (J.A. Co., Inc., Lincoln, NE, USA) CompleteEASE software. For devices best value power efficiency approximately 0.38%, (Mol3 PDT) 111 nm, short-circuit current density JSC 32.81 μA/cm2 open–circuit voltage VOC 0.78 V. Finally, we demonstrated double-layer light-emitting diodes PVK) electron transporting material layer, ETM (2-[3,5-bis(4-phenyl-2-quinolyl)phenyl]-4-phenylquinoline (Tris-Q). Bright bluish-green light originating from observed device, ITO/PEDOT:PSS/active layer/ETM/Ca/A. mixture PV-doped 1H-pyrazolo[3, 4-b]quinoline dyes. An OLED device constructed employing as emitter, which gave deep spectra range 481–506 nm. maximum brightness at 1436.0 cd/m2 achieved for diode Mol3 (1-phenyl-3-phenyl-6-CF3-1H-pyrazolo[3,4-b]quinoline) [R1 Ph, R3 Ph R6 CF3]. up 1.26 cd/A 506 nm CIE 0.007, 0.692.