ITO-free top emitting organic light emitting diodes with enhanced light out-coupling

Yambem, S. D., Ullah, M., Tandy, K., Burn, P. L., & Namdas, E. B. (2014) ITO-free top emitting organic light emitting diodes with enhanced light out-coupling. Laser and Photonics Reviews, 8(1), pp. 165-171.

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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.

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8 citations in Web of Science®

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ID Code: 86726
Item Type: Journal Article
Refereed: Yes
Keywords: Organic light emitting diodes, Top emitting, Transparent indium tin oxide free anode, Bottom-emitting devices, Current efficiency, External quantum efficiency, Indium tin oxide free, Organic light emitting diodes(OLEDs), Solution processed polymers, Top-emitting, Top-emitting oled structures, Display devices, Molybdenum oxide, Organic light emitting diodes (OLED)
DOI: 10.1002/lpor.201300148
ISSN: 18638880 (ISSN)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: © 2013 by WILEY-VCH Verlag
Deposited On: 20 Aug 2015 04:34
Last Modified: 20 Aug 2015 04:34

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