Abstract

Organic light-emitting devices (OLEDs) have attracted much interest due to their high quantum efficiencies and their ease of fabrication. One of the most intriguing advantages of OLEDs is the possibility to deposit large area devices on flexible substrates. We have fabricated a flexible second-order distributed feedback conjugated polymer laser by spincoating a ladder-type poly(p-phenylene) (LPPP) on top of a low-cost plastic substrate with a periodic height modulation. Fig. 1 presents the blue-green single mode lasing spectrum emitted perpendicular to the polymer film when the device is optically pumped well above the threshold excitation pulse energy of only 1.5 nJ. For comparison we show the broad photoluminescence spectrum measured for low excitation pulse energy as an inset in Fig. 1.

© 1998 IEEE