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.