the external quantum efficiency of this device varied from 0 01 at 3v to 0 1 at 9v the measurements of the polarization properties were carried out in the following way a polarisation filter was placed between the polymer light emitting diode and a photo detector the polarization filter was rotated while the intensity was measured for some angles the result of this is given in fig6 this polarization behavior corresponds to similar measurements of photoluminescence for oriented meh ppv t w hagler et al physical review b 44 8652 1991 the achieved polarization ratio of 2 4 indicates that the emission mostly occur in the stretch oriented layer on the basis of this the polarization ratio has to be over 10 in the oriented layer to achieve a polarization ratio of 2 4 if the emission was equally distributed over the entire polymer volume all measurements were carried out at room temperature in ambient atmosphere and on one and the same diode example 2 was repeated but popt was now used as the emitting layer instead of ptopt connections were achieved in the same way for the electrodes and popt was used for the stretching instead of ptopt the pe popt structure was elongated 1 5 times the initial length the thickness of the popt layer was 100 nm before the stretching procedure then the device was connected to wires and voltage applied the device emitted polarized light with color of red near infrared the light was bright enough to be visible in indoor.