Cost-effective Ink-jet Production of Large-area OLED Displays

Given by Epson’s Takuya Sonoyama, the paper reported progress in red, green and blue P²OLED device performance in spin-coated devices and ink-jet printed devices. Demonstrating the high luminous efficiency of PHOLED technology, the team made significant progress in extending the operating lifetimes of its red and green material P²OLED systemsº Red with CIE(0.66, 0.33), luminous efficiency of 9 cd/A and greater than 50,000 hours of operating lifetime to 50% of initial luminance (at 500 cd/m²) and green with CIE(0.33, 0.63), 35 cd/A and greater than 50,000 hours (at 1000 cd/m²). The team also reported data for a new sky blue P²OLED with CIE(0.19, 0.40), 18 cd/A and greater than 3,000 hours (at 500 cd/m²). In addition, results with ink-jet printed P²OLED devices were reported which demonstrate the excellent film-forming ability of the small molecule layers. Ink-jet printed green P²OLED devices were also demonstrated to have the same efficiency as those of the spin-coated control P²OLEDs following an in-depth study of solvent selection and process optimization.