The Study On The All Solution Processed Flexible WOLED

Because of the discovery of organic electroluminescence, new and revolutionary fields have opened up in display and lighting industry. Thus, the white organic light-emitting devices have extremely broad and important application. In this research, we acquired a single layer of white organic light-emitting active layer by using fluorine blue material PFO doped MEH-PPV. A conductive film of poly (3,4-ethylenedioxythiophene-theophany)/polystyrene sulfate was fabricated and was used as electrodes of the organic light-emitting devices. We fabricated white organic light-emitting devices with the extremely simple and flexibly process. The specific research work of these dissertations is divided into three parts:Firstly, white light organic emission layer was prepared by using fluorine blue material PFO doped with MEH-PPV. The I-V-L and spectral characteristics and stability of the color coordinates of the white organic light-emitting devices was investigated at different doping concentration. With the doping ratio of2.5wt%, the device shows turn-on voltage of3V, and color coordinates of (0.33,0.33) at11V. The color coordinates of the device was stable in a large voltage range, and located in the ideal white area in the range of5~20V voltage.Secondly, all-solution method was used to fabricate polymer light-emitting diodes. In this method, firstly a highly conductive polymer film of PEDOT: PSS was prepared; secondly on a separate substrate all active layers were prepared using full solution process, lastly the PEDOT: PSS anode film was attached onto the active layer to finish the organic light-emitting devices. Then, optimization of the device was performed by introducing PEDOT and Cs2CO3as a carrier injection layer. Furthermore, experiment explores the impact of the Cs2CO3film thickness on device performance. The luminous intensity can reach375cd/m2and the efficiency of0.24cd/A can be achieved.Thirdly, the flexible light-emitting diodes were fabricated. The device was fabricated on a flexible PET substrates coated with ITO transparent electrode layer as a cathode. In the active layer the doping ratio of MEH-PPV to PFO is kept at2.5wt%. Finally a lamination process was performed to complete the organic light-emitting device.