A Lasing Organic Light-Emitting Diode

Direct structuring of photocrosslinkable polyspirobifluorene copolymers by holographic lithography to yield insoluble, organic, distributed feedback (DFB) lasers with thresholds as low as 2 mu J cm(-2) is reported (see figure). These DFB lasers (X-LEP layer in figure) are embedded in the first optimized, multilayered slab-waveguide organic light-emitting diode with good luminance efficiency of similar to 6 cd A(-1) and concomitant low laser thresholds. The effect of electrical excitation on the optically pumped laser is investigated for the first time.