White Light-Emitting Device on Flexible Plastic Substrates

Current density [mA/cm] L um in an ce [c d/ m 2 ] Voltage [V] Over last several years, light-emitting devices based on organic materials have been attractive research subjects because of their potential applicability to large size flat panel displays and solid-state lighting with low fabrication costs and easy manufacturing processes. Recently, the topic of white light generation from singlelayer OLEDs has also been a very active research area since this type of device can be used as a plane light source for current large size liquid-crystal display (LCD) TVs and/or flexible full color displays implemented in combination with the color filters. Until now, all studies for generating the white light emission from either small molecules [1] or polymers [2, 3] based devices have been based on glass substrates. However, for the future flexible display or flexible solidstate lighting applications, the development of the white light on flexible plastic substrates is essential. Fig 1. Luminance-current-voltage characteristics of blend PLED.