Study On The Encapsulation Of Organic Light-emitting Diode Materials With AAO

Organic light-emitting diodes (OLEDs) are promising devices in the field of display because of active luminescence, low power consumption, wide viewing angle, good contrast, and quick response time. In order to relize industrialization of OLED presently, the high-powered encapsulation is mostly required to resolve. In this thesis, anodic aluminum oxide(AAO) is applied as the template to prepare the organic light-emitting device (OLED). Under the protection of AAO's hole wall, the resolution and the life of OLED have been improved greatly. This will undoubtedly enhance the development of microform display devices. PANI,Alq3,Cu of nanowire arrays were prepared by electrochemical deposition and absorption into the nanoporous anodic alumina oxide (AAO) templates. These experiments will make great contributions to the encapsulation of OLEDs with structure of Cu/Alq3/PANI/ITO.The anodic aluminum oxide membranes were prepared by two-step oxidation in the solution of oxalic acid when the voltage is 60V, and stripped from the aluminum substrate adopting strip against electricity technique. The oxide barrier layer was chemically dissolved from bottom side of the film in phosphoric acid. The diameters of AAO's holes are 120nm.The Alq3 nanowire arrays were prepared in the pores of the AAO membrane using absorption method: the AAO was dipped into the acetone solution (>2g/L) of Alq3 and after the pores of the AAO were filled enough, the Alq3 nanowires were prepared in AAO through dryness. The morphology, structure and optic properties of the nanowires were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Infra-red(IR) spectrometer, Fluorescence spectroscopy. Experiment results indicate that: the diameter of Alq3 nanowire is about 110nm; the peak of photoluminescence of the Alq3 nanowires and Alq3 nano-particles have exhibited a blue shift, compared with Alq3 dissolved in acetone solution. The nanowire arrays of PANI and Cu were deposited into AAO by single-bath method, moreover, the PANI/Alq3 and PANI/Cu multiplayer nanowires were prepared by dual-bath method using AAO templates. The morphology of nanowires were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM). The structures of PANI, PANI/Cu and PANI/Alq3 nanowires were studied by IR and XRD. It indicates that the multi-bath method is suit for the deposition of PANI, Alq3 and Cu successively. Then, the OLED with structure of ITO/PANI/Alq3/Cu can be prepared.