Polyethylenimine(PEI) interlayer rinsing with different solvents for inverted organic light emitting diodes(OLEDs)is systematically studied in this paper. In comparison with the pristine one, the maximum current efficiency(CE_(max)) and power efficiency(PE_(max)) are enhanced by 21% and 22% for the device rinsing by ethylene glycol monomethyl ether(EEA).Little effect is found on the work function of the PEI interlayer rinsed by deionized water(DI), ethanol(EtOH), and EEA.On the other hand, the surface morphologies of PEI through different solvent treatments are quite different. Our results indicates that the surface morphology is the key to improving the device performance for IOLED as the work function of PEI keeps stable. 相似文献
Electroluminescence performances are improved by inserting a semiconductor zinc oxide (ZnO) buffer layer into the emissive tris-(8-hydroxyquinoline)aluminum (Alq3) layer and the semitransparent Al/Ag cathode in top-emitting organic light-emitting diodes (TEOLEDs) with structures of Si/SiO2/Ag/Ag2O/4,4′, 4″-tris(3- methylphenylphenylamino)triphenylamine/ 4,4′-bis[N-(1-naphthyl-1-)-N-phenyl- amino]-biphenyl/Alq3/ZnO/Al/Ag. The thermal deposition of ZnO layer onto Alq3 results in Alq3 anion formation, which is beneficial to electron injection by generating some new energy levels in the forbidden band of Alq3. In addition, a large hole-injection barrier of 2 eV at the interface of Alq3/ZnO effectively blocks hole injection into Al/Ag cathode, leading to more carrier recombination in the emissive region. 相似文献
Summary: Modern multilayer organic light‐emitting devices (OLED) are fabricated easily and at low cost by spin‐coating with subsequent crosslinking of the layers. For this purpose, a low‐molecular‐weight hole‐transport material based on triphenyl amines bearing crosslinkable oxetane groups was synthesized. Crosslinking of the spin‐coated layer was initiated with UV irradiation using an iodonium‐salt photoinitiator and was observed using realtime FT‐IR spectroscopy. Standard photolithography techniques can be used for structuring the material on the micrometre scale.
An AFM image of the photopatterned bis‐oxetane‐functionalized low‐molecular‐weight hole‐transport material based on triphenyl amines synthesized here. 相似文献