Publication details for Dr Mujeeb Ullah ChaudhryYambem, Soniya D., Ullah, Mujeeb, Tandy, Kristen, Burn, Paul L. & Namdas, Ebinazar B. (2014). ITO-free top emitting organic light emitting diodes with enhanced light out-coupling. Laser & Photonics Reviews 8(1): 165-171.
- Publication type: Journal Article
- ISSN/ISBN: 1863-8880 (print)
- DOI: 10.1002/lpor.201300148
- Further publication details on publisher web site
Author(s) from Durham
Bottom emitting organic light emitting diodes (OLEDs) can suffer from lower external quantum efficiencies (EQE) due to inefficient out-coupling of the generated light. Herein, it is demonstrated that the current efficiency and EQE of red, yellow, and blue fluorescent single layer polymer OLEDs is significantly enhanced when a MoOx(5 nm)/Ag(10 nm)/MoOx(40 nm) stack is used as the transparent anode in a top emitting OLED structure. A maximum current efficiency and EQE of 21.2 cd/A and 6.7%, respectively, was achieved for a yellow OLED, while a blue OLED achieved a maximum of 16.5 cd/A and 10.1%, respectively. The increase in light out-coupling from the top-emitting OLEDs led to increase in efficiency by a factor of up to 2.2 relative to the optimised bottom emitting devices, which is the best out-coupling reported using solution processed polymers in a simple architecture and a significant step forward for their use in large area lighting and displays.