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

Yambem, Soniya D., Ullah, Mujeeb, Tandy, Kristen, Burn, Paul L. and Namdas, Ebinazar B. (2014) ITO-free top emitting organic light emitting diodes with enhanced light out-coupling. Laser and Photonics Reviews, 8 1: 165-171. doi:10.1002/lpor.201300148


Author Yambem, Soniya D.
Ullah, Mujeeb
Tandy, Kristen
Burn, Paul L.
Namdas, Ebinazar B.
Title ITO-free top emitting organic light emitting diodes with enhanced light out-coupling
Journal name Laser and Photonics Reviews   Check publisher's open access policy
ISSN 1863-8880
1863-8899
Publication date 2014
Year available 2013
Sub-type Article (original research)
DOI 10.1002/lpor.201300148
Open Access Status
Volume 8
Issue 1
Start page 165
End page 171
Total pages 7
Place of publication Weinheim, Germany
Publisher Wiley - V C H
Collection year 2014
Language eng
Abstract 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.
Keyword Organic light emitting diodes
Top emitting
Transparent indium tin oxide free anode
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 6 November 2013.

 
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