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 100cd/m(2) from 30cd/m(2) while a corresponding increase for the PFO based LED is to 160cd/m(2) from 80cd/m(2) with and without EBL, respectively. (C) 2009 Elsevier B.V. All rights reserved.