White LED based on polyfluorene Co-polymers blend on plastic substrate

Abstract

We report on high-performance, white light emission from polyfluorene co-polymers blend and study of the opto-electrical properties of polymer blend light-emitting devices (PLEDs) fabricated on plastic substrate. Our results show that efficient white light emission via energy transfer, producing higher device efficiencies and luminance in comparison with the conventional single PLEDs, can be realized by blending carrier donor (host) and acceptor (guest) organic polyfluorene co-polymers. A maximum luminance of /spl sim/7400 cd/m/sup 2/ was achieved at 13 V with Internationale de L'Eclairage coordinates of (0.33, 0.33). Maximum emission efficiency of /spl sim/2.0 cd/A and power efficiency of /spl sim/1.1 lm/W are obtained for white light PLEDs on plastic substrate.