Document Type
Journal Article
Keywords
Current efficiency, Electroluminescence spectra, High contrast, Intermediate layers, Metal organic metals, Operating voltage, Organic light-emitting devices, Organic phase, Phase tuning, Power efficiency, Reflection spectra, Tandem devices, Visible range, Flat panel displays, Industrial applications, Light, Tuning, Cathodes
Faculty
Faculty of Computing, Health and Science
School
Electron Science Research Institute / Centre of Excellence for MicroPhotonic Systems
RAS ID
14212
Abstract
The use of a black cathode with a metal-organic-metal structure is an attractive approach to achieving a high-contrast organic light-emitting device (OLED) for future-generation flat panel displays. However, the large reduction in OLED power efficiency is currently restricting the use of the black cathode for industrial applications. In this paper, a high-contrast, high-efficiency tandem OLED employing a black cathode is proposed and experimentally demonstrated. The OLED is implemented by stacking two organic phase tuning layers between a composite intermediate layer of LiF/Al/C60 and LiF/Al and optimizing their thicknesses. Electroluminescence spectra and brightness-current measurement reveal that the phase tuning layer emits photons. Such a tandem device can increase the current efficiency by 110% and reduce the operating voltage by 1.3 V, in comparison to the conventional high-contrast OLED. Measured reflection spectra validate the high-contrast capability of the OLED and demonstrate experimentally an average reflectance of 5.9% in the visible range from 400 to 750 nm, which is much lower than 20.3% for the conventional high-contrast OLED.
Access Rights
free_to_read
Comments
This is an Author's Accepted Manuscript of: Ding, B. , & Alameh, K. (2012). High-contrast tandem organic light-emitting devices employing semitransparent intermediate layers of LiF/Al/C60. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 116(46), 24690-24694. Available here
This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see here. See http://pubs.acs.org/page/policy/articlesonrequest/index.html.