Fabrication And Characterization Of Liq And The Research On Its OLED

In recent years, organic light-emitting devices (OLEDs) have attracted much interest due to their merits and potential applications in flat panel displays. The merits of OLED contain: (1) easy to realize full color display due to the wide choice scope of organic electroluminescent materials, in particular the realization of the blue light which cannot be met in inorganic light emitting diodes;(2) high brightness and luminescent efficiency;(3) low direct current drive voltage and low power consumption, being matched with integration drive circuit;(4) simple fabrication techniques and low cost;(5) realizing large-scope flat panel display with wide visual angle;(6) sound machine processing capability and flexible figures. But it still has a lot of shortcomings such as clumsy volume, few species of materials, complex technology of device fabrication, high cost, high power consumption, etc. The thesis makes a comprehensive and thorough study of the organic light-emitting materials and OLED based on the No.60276026Natural Science Fund of China.The thesis begins with the introduction of the history and development of the OLED technology and materials, device configuration, work principle and the electrical current conduction mechanism of OLED. Next , Blue organic light-emitting material Liq is synthesized, purified with chemical and physical methods. The pureness of Liq is inspected with liquid chromatogram and element analytical methods. Then the structure token of Liq is carried out by X-ray diffraction, IR spectra, UV absorption spectra, cyclic voltammeter and fluorescence spectra, fluorescence spectrum. Liq/ITO samples are prepared by vacuum evaporation deposition method. Moreover the surface and interface electron states are studied by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) technique. Finally the blue OLED is fabricated and demonstrated. The change of current, electroluminescence and brightness with applied bias is tested. The effect of thickness of light-emitting layer on the I-V and the brightness of OLED are studied.