Increased luminance of MEH–PPV and PFO based PLEDs by using salmon DNA as an electron blocking layer

The effect of salmon DNA–CTMA as an electron blocking layer (EBL) has been examined on the performance of MEH–PPV and PFO-based light emitting diodes. Though the turn-on voltage increases with incorporation of EBL, a significant increase in luminance and luminous efficiency for both the devices is observed. The EBL improves the device performance by blocking electrons at the EBL–polymer interface, thereby increasing the recombination probability of electrons and holes. The luminance of the MEH–PPV based Bio-LED increases to 100 cd/m2 from 30 cd/m2 while a corresponding increase for the PFO based LED is to 160 cd/m2 from 80 cd/m2 with and without EBL, respectively.