| Abstract [eng] |
The aim was to explore electric, photoelectric and optical properties of blue organic light emitting devices (acr. OLED) that was made using quinoline derivatives. In this research OLED’s have been deposited using thermal evaporation technology. A struc-ture of layers have been formed on a glass with indium tin oxide anode: hole transport layer (TPD), emission layer, hole blocking layer (TmPyPB), electron transport layer (Alq3) and a cathode (LiF/Al). The thickness of sample was measured using CELIV method. The thickness of deposited OLED structures varied in 110 nm - 195 nm range. To determine if the spectrum of a measured OLED corresponds to emission of the emissive layer a reference OLED 0 was made. Also, the ab-sorbance and ionizing potential were measured to determine HOMO and LUMO energy levels. This helped to determine, which layer is responsible for the emissive recombination of charge carriers. We studied three groups of materials: quinolone derivatives with chlorine substituents, phenylimidazo phenantroline and ligands with lantanoids. In this research the main focus was on the quinoline de-rivatives. We noticed, that luminescence at 460 nm in OLED A2 and OLED A3, was due to the at-tached phenyl (Ph) group. TPD emission in devices with B group materials dominated due to ben-zene ring position in emissive B group materials, because there was a lack of exciton annihilation in emissive layer. In solutions using solvents of different dipole moment a batochromic and solvato-chromic shift of B, C and D group materials was observed due to dipole – dipole interaction. It was obtained that there was no EL and PL in OLEDs with C group material layers. The luminescence intensity of OLED D1 was twice as higher as of OLED 0. This might be because emissive layer D1 in OLED D1 enhances electron transfer into TPD layer. |
