Abstract:Abstract:In this study, we investigated the ink formulation of poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as the hole injection layer (HIL) in an organic light emitting diode (OLED) structure. Generally, in a PEDOT:PSS solution, water is incorporated in the solution for the solution process. However, the fabrication of thin film which contained the water, main solvent, could not easily form by using printing technology except spin-coating process because of the high surface tension o… Show more
“…Among those of the applications, there have been many researches to study fabrication of flexible OLEDs using printing technologies such as inkjet printing [6], aerosol jet [7], screen printing [8], electrohydrodynamic jet [9] and nozzle jet printing [10]. Nozzle jet printing is a continuous jetting technique that utilizes constant air pressure with flow pump.…”
We fabricated an organic light emitting diode using poly(9vinylcarbazole) : tris[2-(p-tolyl)pyridine]iridium(III) emitting layer fabricated by nozzle jet printing. Uniform thin films were formed onto both of glass and PEN substrate. Bending test of the flexible OLEDs was also demonstrated and its performance was stably maintained until 300 cycles of bending.
“…Among those of the applications, there have been many researches to study fabrication of flexible OLEDs using printing technologies such as inkjet printing [6], aerosol jet [7], screen printing [8], electrohydrodynamic jet [9] and nozzle jet printing [10]. Nozzle jet printing is a continuous jetting technique that utilizes constant air pressure with flow pump.…”
We fabricated an organic light emitting diode using poly(9vinylcarbazole) : tris[2-(p-tolyl)pyridine]iridium(III) emitting layer fabricated by nozzle jet printing. Uniform thin films were formed onto both of glass and PEN substrate. Bending test of the flexible OLEDs was also demonstrated and its performance was stably maintained until 300 cycles of bending.
“…Inkjet printing allows for a low-cost fabrication with a relatively high accuracy, whereas capillary action could be used to make pump-free microfluidic devices on paper-based substrates; therefore, authors concluded, with further progress in the field of printed electronics, the inkjet-printed and paper-based low-cost sensors would be implemented in near future. Another application for OLED was presented with nozzle-printed PEDOT:PSS by Yoon et al [9]. They investigated the influence of mixing ratio of ethanol to PEDOT:PSS on the quality of nozzle-printed patterns and eventually the performance of OLED device which used the diluted PEDOT:PSS as a hole injection layer.…”
“…The feasibility of inkjet printing technology in the production of printed displays has been verified by applying such technology in the laboratory. For example, the hole injection layer 5 (HIL), hole transport layer 6 (HTL), emission layer 7 (EML), and thin film encapsulation 8 (TFE) layer of OLEDs have been prepared by printing. Figure 1 Simplified diagram of the OLED structure and production flow.…”
Inkjet printing technology is expected to enhance printed display mass production technology in the future. Nozzle-array printheads form the basis for printed display mass production applications. However, jet instability caused by air bubble entrapment and nozzle wettability changes during the printing process is a major challenge in the application of this technology. To adapt to possible nozzle abnormalities, a high-adaptability nozzle-array printing system based on a set covering printing planning (SCPP) model for printed display manufacturing is designed in this study. The study consists of two parts. First, a printing system based on multistep visual inspection and closed-loop feedback is proposed to accurately detect and screen abnormal nozzle positions. Notably, the inkjet printing system can identify nozzles with abnormal ejection characteristics and ensure that the remaining nozzles work accurately and stably. Then, an SCPP model is established for display pixel printing planning by using the remaining normal nozzles on the nozzle-array printhead. This model can output the most efficient printing path and nozzle printing action and can adapt to any pixel pattern, nozzle type, and abnormal nozzle distribution. The system and technology are highly adaptable and scalable for fabricating large-area printed display devices.
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