The Application of Higher-order Microcavity in RGB OLEDs

• Main Authors: Cheng-Jung Hsieh, 謝政蓉
• Other Authors: Nien-Po Chen
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/95247966289242479800

碩士 === 元智大學 === 光電工程研究所 === 95 === The organic light emitting diodes (OLEDs) can be applied to display technology, with the advantage of compact sizes. Usually, it requires the research and development of new organic materials to enhance the emission intensity and chromaticity accuracy. However, the application of microcavity to OLEDs can achieve the same goal with the existent organic materials. A typical microcavity consists of the quarter wave stacks (QWS) as one of the reflectors. The thickness of the QWS layers is specified for the particular wavelength to be resonant. Consequently, to enhance the red, green, and blue (RGB) OLEDs requires three different designs of the QWS and the microcavities. In order to have a single reflector design for all RGB OLEDs, we study and simulate the stack reflector of higher order. By means of the designed phase variation over the wavelength range, we obtain the suitable optical length of the microcavities, which is the function of the wavelength and can fulfill the resonant conditions at the three wavelengths of RGB by the same reflector design. Also, we investigate the cause and the solution of the cross-talk between the neighboring resonant peaks. The novel design of the reflector can be applied to the full color display of OLEDs, where each pixel of RGB can share the same reflector to reduce the fabrication processes. The new display design will have brighter intensity and more accurate chromaticity.