The Theoretical Research On Top-emitting White Organic Light-emitting Devices

Currently the main technologies for flat panel displays are LCD, VFD, PDP, FED, LED, OLED etc. With the rapid development of science and technology, the thin, light, weight, high-definition flat panel displays become mainstream display. Organic electroluminescent display technology has many advantages as the industry recognized, most likely to replace LCD as one of the new generation of flat panel display technology. OLED can be divided into BEOLED and TEOLED. TEOLED emit light from the top, which makes the separation of light-emitting surface and the substrate and solves the competition between the luminous area and the pixel driver circuit, solutions the problem of the aperture ratio from the fundamental. TEOLED usually has metal electrode and semi-transparent metal electrode, which may form the optical micro-cavity between the two electrodes. Because TEOLED has the optical micro-cavity so it has many advantages compared with BEOLED. For example that can select the emission wavelength to attune the colors of the device, narrow spectrum, improve the color purity of the light, improves the luminous efficiency of the device. One-dimensional photonic crystals can be prepared easy, in the practical application has been widely used. In the TEOLEDS using the MOPC as electrode has a great advantage.In the thesis, I analyze the optical properties of Ag as the metal layer of the MOPC and the optical properties of samarium as the metal layer of the MOPC by transfer matrix method based on theory of optical thin film using Matlab software. When light incident from organic materials, I analyze the influence of parameters of MOPC (such as metal layer thickness, organic dielectric layer thickness, number of cycles) on the reflectivity, transmission and reflection phase of the visible light, which provide a theoretical guidance for the actual design of the electrode. When MOPC as the electrode of TEOLED, anode structure is (Sm/Alq3)n/Ag, device structure is Ag/Al/LiF/Alq3/NPB/(Sm/Alq3)n/Ag/Sio2/Si, I analyze the influences of parameters of MOPC (such as metal layer thickness, organic dielectric layer thickness, number of cycles) on the CR and resonance wavelength. When cathode structure is (Alq3/Sm)n, device structure is (Alq3/Sm)n/Alq3/NPB/Ag/Sio2/Si, I analyze the influences of parameters of MOPC (such as metal layer thickness, organic dielectric layer thickness, number of cycles) on the CR and resonance wavelength. When the light-emitting devices using photonic crystals are two electrodes, device structure is (Alq3/Sm)n/Alq3/NPB/(Sm/Alq3)2/Ag/Sio2/Si, I analyze the influences of parameters of MOPC (such as metal layer thickness, organic dielectric layer thickness, number of cycles) on the CR and resonance wavelength. Through analysis of these three different situations which can obtain the different influences of parameters of MOPC on the CR and resonance wavelength of TEOLED.In the thesis, I analyze the influences of Sm layer thickness, Alq3 layer thickness and number of cycles on the CR and resonance wavelength of TEOLED. According to actual needs, select the appropriate design. On the design of high-contrast white top emission organic light emitting device has played a guiding role.