Abstract
In this study, blade-only solution process is used to manufacture small area green phosphorescence organic light-emitting diode. Not only do we change the device structure, but also select different material to prolong the operated lifetime of the device. We start with researching the triple-layer organic light-emitting diode. In order to prevent the charge accumulation between organic layers solving the problem about charge unbalance, we reduce number of organic layers to form single-layer structure. In addition to this, the device coated with a thin layer of cross-linked hole transporting material Poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4’-(N-(4-secbutylphenyl)diphenylamine] (TFB) and matched with CsF/Al electrode can achieve maximum current efficiency to 31cd/A, and maximum luminance to 30000 cd/m2. The result shows that we successfully balance the charge injection and lower the charge accumulation. After the improvement, the operated lifetime can achieve to 80 hours under initial luminance of 1000 cd/m2,and the operated lifetime can achieve to 250 hours under initial luminance of 500 cd/m2, and longer than 400 hours under initial luminance of 100 cd/m2. Trying to repeat the result of small area (0.45 cm2) blue fluorescence organic light-emitting diode in 4 cm by 3 cm large-area device is another part of this study. By using accelerated blade-coating, we can uniformly form a 4 cm by 4 cm thin film, which thickness difference between front end and back end with only 1 nm. After optimizing the factors of the process, the defect of the large-area device can be solved. Moreover, the device can achieve maximum current efficiency to 4 cd/A. Our research team can start to fabricate some conceptual product under this consequent.